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WO2002048106A2 - Isoindolin-1-one glucokinase activators - Google Patents

Isoindolin-1-one glucokinase activators Download PDF

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Publication number
WO2002048106A2
WO2002048106A2 PCT/EP2001/014404 EP0114404W WO0248106A2 WO 2002048106 A2 WO2002048106 A2 WO 2002048106A2 EP 0114404 W EP0114404 W EP 0114404W WO 0248106 A2 WO0248106 A2 WO 0248106A2
Authority
WO
WIPO (PCT)
Prior art keywords
oxo
isoindol
propionamide
dihydro
cyclohexyl
Prior art date
Application number
PCT/EP2001/014404
Other languages
French (fr)
Other versions
WO2002048106A3 (en
Inventor
Kevin Richard Guertin
Original Assignee
F. Hoffmann-La-Roche Ag
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to DK01986857T priority Critical patent/DK1349856T3/en
Priority to MXPA03005170A priority patent/MXPA03005170A/en
Priority to BR0116169-5A priority patent/BR0116169A/en
Priority to NZ526236A priority patent/NZ526236A/en
Priority to JP2002549637A priority patent/JP4021766B2/en
Priority to PL01366006A priority patent/PL366006A1/en
Priority to CA2430579A priority patent/CA2430579C/en
Priority to KR10-2003-7007869A priority patent/KR100520651B1/en
Priority to DE60111570T priority patent/DE60111570T2/en
Priority to SI200130381T priority patent/SI1349856T1/en
Priority to IL15626401A priority patent/IL156264A0/en
Priority to EP01986857A priority patent/EP1349856B1/en
Application filed by F. Hoffmann-La-Roche Ag filed Critical F. Hoffmann-La-Roche Ag
Priority to AT01986857T priority patent/ATE297922T1/en
Priority to AU3841502A priority patent/AU3841502A/en
Priority to SK873-2003A priority patent/SK8732003A3/en
Priority to HU0400587A priority patent/HUP0400587A3/en
Priority to AU2002238415A priority patent/AU2002238415B2/en
Publication of WO2002048106A2 publication Critical patent/WO2002048106A2/en
Publication of WO2002048106A3 publication Critical patent/WO2002048106A3/en
Priority to IL156264A priority patent/IL156264A/en
Priority to HR20030450A priority patent/HRP20030450B1/en
Priority to NO20032674A priority patent/NO325810B1/en
Priority to BG107903A priority patent/BG107903A/en
Priority to HK04106031A priority patent/HK1063314A1/en
Priority to CY20051101133T priority patent/CY1105587T1/en

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D401/00—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, at least one ring being a six-membered ring with only one nitrogen atom
    • C07D401/02—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, at least one ring being a six-membered ring with only one nitrogen atom containing two hetero rings
    • C07D401/12—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, at least one ring being a six-membered ring with only one nitrogen atom containing two hetero rings linked by a chain containing hetero atoms as chain links
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P3/00—Drugs for disorders of the metabolism
    • A61P3/08—Drugs for disorders of the metabolism for glucose homeostasis
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P3/00—Drugs for disorders of the metabolism
    • A61P3/08—Drugs for disorders of the metabolism for glucose homeostasis
    • A61P3/10—Drugs for disorders of the metabolism for glucose homeostasis for hyperglycaemia, e.g. antidiabetics
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P43/00—Drugs for specific purposes, not provided for in groups A61P1/00-A61P41/00
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P5/00—Drugs for disorders of the endocrine system
    • A61P5/48—Drugs for disorders of the endocrine system of the pancreatic hormones
    • A61P5/50—Drugs for disorders of the endocrine system of the pancreatic hormones for increasing or potentiating the activity of insulin
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D403/00—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, not provided for by group C07D401/00
    • C07D403/02—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, not provided for by group C07D401/00 containing two hetero rings
    • C07D403/12—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, not provided for by group C07D401/00 containing two hetero rings linked by a chain containing hetero atoms as chain links
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D413/00—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and oxygen atoms as the only ring hetero atoms
    • C07D413/02—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and oxygen atoms as the only ring hetero atoms containing two hetero rings
    • C07D413/12—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and oxygen atoms as the only ring hetero atoms containing two hetero rings linked by a chain containing hetero atoms as chain links
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D417/00—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and sulfur atoms as the only ring hetero atoms, not provided for by group C07D415/00
    • C07D417/02—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and sulfur atoms as the only ring hetero atoms, not provided for by group C07D415/00 containing two hetero rings
    • C07D417/12—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and sulfur atoms as the only ring hetero atoms, not provided for by group C07D415/00 containing two hetero rings linked by a chain containing hetero atoms as chain links

Definitions

  • Glucokinase is one of four hexokinases that are found in mammals [Colowick, S.P., in The Enzymes, Nol. 9 (P. Boyer, ed.) Academic Press, New York, NY, pages 1-48, 1973].
  • the hexokinases catalyze the first step in the metabolism of glucose, i.e., the conversion of glucose to glucose-6-phosphate.
  • Glucokinase has a limited cellular distribution, being found principally in pancreatic ⁇ -cells and liver parenchymal cells.
  • GK is a rate-controlling enzyme for glucose metabolism in these two cell types that are known to play critical roles in whole-body glucose homeostasis [Chipkin, S.R., Kelly, K.L., and Ruderman, N.B. in Joslin's Diabetes (C.R. Khan and G.C. Wier, eds.), Lea and Febiger, Philadelphia, PA, pages 97-115, 1994].
  • concentration of glucose at which GK demonstrates half-maximal activity is approximately 8 mM.
  • the other three hexokinases are saturated with glucose at much lower concentrations ( ⁇ 1 mM).
  • GK does indeed play a critical role in whole- body glucose homeostasis. Animals that do not express GK die within days of birth with severe diabetes while animals overexpressing GK have improved glucose tolerance (Grape, A., Hultgren, B., Ryan, A. et al., Cell 83, 69-78, 1995; Ferrie, T., Riu, E., Bosch, F. et al., EASES J., 10, 1213-1218, 1996). An increase in glucose exposure is coupled through GK in ⁇ -cells to increased insulin secretion and in hepatocytes to increased glycogen deposition and perhaps decreased glucose production.
  • GK Gkinase activators
  • Glucokinase activators will increase the flux of glucose metabolism in ⁇ -cells and hepatocytes, which will be coupled to increased insulin secretion. Such agents would be useful for treating type II diabetes.
  • This invention provides a compound comprising an amide of the formula:
  • A is unsubstituted phenyl or phenyl which is mono- or di- substituted with halo or mono-substituted with lower alkyl sulfonyl, lower alkyl thio or nitro;
  • R 1 is cycloalkyl having from 3 to 9 carbon atoms or lower alkyl having from 2 to 4 carbon atoms;
  • R 2 is an unsubstituted or mono-substituted five- or six-membered heteroaromatic ring connected by a ring carbon atom to the amine group shown, which five- or six- membered heteroaromatic ring contains from 1 to 3 heteroatoms selected from sulfur, oxygen or nitrogen, with one heteroatom being nitrogen which is adjacent to the connecting ring carbon atom, which ring may be monocyclic or fused with phenyl at two of its ring carbons, said monosubstituted heteroaromatic ring being monosubstituted at a position on a ring carbon atom other than adjacent to said connecting carbon atom with a substituent selected from the group consisting of halo, lower alkyl, nitro, cyano, perfluoro-lower alkyl; hydroxy, -(CH 2 ) n -OR 3 , -(CH 2 ) n -C(O)- OR 3 , -(CH 2 ) ceremoni-C(O)-
  • R 2 is a five- or six-membered heteroaromatic ring connected by a ring carbon atom to the amine group shown in formula I, which five- or six-membered heteroaromatic ring contains from 1 to 3 heteroatoms selected from sulfur, oxygen or nitrogen, with one heteroatom being nitrogen which is adjacent to the connecting ring carbon atom.
  • This ring may be monocyclic or may be fused with phenyl at two of its ring carbons.
  • the adjacent nitrogen in the nitrogen containing heteroaromatic rings may be in the form of an N- oxide where the nitrogen adjacent to the ring carbon atom is converted to an N-oxide.
  • compounds of formula I can be in the form of pharmaceutically acceptable salts.
  • Glucokinase activators are useful for increasing insulin secretion in the treatment of type ⁇ diabetes.
  • the present invention also relates to a pharmaceutical composition
  • a pharmaceutical composition comprising a compound of formula I and a pharmaceutically acceptable carrier and/or adjuvant.
  • the present invention relates to the use of such compounds as therapeutic active substances as well as to their use for the preparation of medicaments for the treatment or prophylaxis of type II diabetes.
  • the present invention further relates to processes for the preparation of the compounds of formula I.
  • the present invention relates to a method for the prophylactic or therapeutic treatment of type II diabetes, which method comprises administering a compound of formula I to a human being or an animal.
  • this invention provides a compound comprising an amide of the formula I above or an N-oxide of the amide of formula I above, as well as pharmaceutically acceptable salts thereof.
  • the V illustrates the asymmetric carbon atom in this compound.
  • the compound of formula I may be present as a racemate at the asymmetric carbon shown.
  • the "S" enantiomers, where the amide is in the "S"configuration at the asymmetric carbon is preferred.
  • the phenyl ring A is monosubstituted with lower alkyl sulfonyl, nitro or lower alkyl thio, it is preferred that it is substituted at the 5- or 6-position as indicated in formula I.
  • A is phenyl substituted with nitro, it is preferred that this substitution be at positions 5 or 6 such as 5-nitro phenyl and 6 nitro phenyl.
  • the R 2 ring as described above is a single, or monocyclic (unfused) ring.
  • R 2 is a monocyclic ring, it is preferably substituted or unsubstituted pyridine.
  • the R 2 ring as described above is a bicyclic ring, i.e. is fused with a phenyl.
  • lower alkyl includes both straight chain and branched chain alkyl groups having from 1 to 10 and preferably 3 to 9 carbon atoms, such as propyl, isopropyl, heptyl, and especially 2 to 4 carbon atoms.
  • cycloalkyl signifies a 3- to 9-membered cycloalkyl ring, preferably 5- to 8-membered, for example cyclopentyl, cyclohexyl, cycloheptyl, or cyclooctyl.
  • perfluoro-lower alkyl means any lower alkyl group wherein all of the hydrogens of the lower alkyl group are substituted or replaced by fluoro.
  • preferred perfluoro-lower alkyl groups are trifluoromethyl, pentafluoroethyl, heptafluoropropyl, etc.
  • lower alkyl thio means a lower alkyl group as defined above bound to the rest of the molecule through the sulfur atom in a thio group.
  • lower alkyl sulfonyl means a lower alkyl group as defined above bound to the ⁇ eY of the molecule through the sulfur atom in a sulfonyl group.
  • halogen is used interchangeably with the word “halo”, and, unless otherwise stated, designates all four halogens, i.e. fluorine, chlorine, bromine, and iodine.
  • N-oxide means a negatively charged oxygen atom which is covalently linked to a nitrogen which is positively charged in a heteroaromatic ring.
  • heteroaromatic ring means a five or six membered unsaturated carbacyclic ring where one or more carbon is replaced by a heteroatom such as oxygen, nitrogen, or sulfur.
  • the heteroaromatic ring may be a single cycle or may be bicyclic, i.e. formed by the fusion of two rings.
  • the heteroaromatic ring defined by R 2 can be an unsubstituted or mono- substituted five- or six-membered heteroaromatic ring having from 1 to 3 heteroatoms selected from the group consisting of oxygen, nitrogen, or sulfur and connected by a ring carbon to the amine of the amide group shown. At least one heteroatom is nitrogen and is adjacent to the connecting ring carbon atom. If present, the other heteroatoms can be sulfur, oxygen or nitrogen.
  • the ring defined by R 2 may be a single cycle.
  • heteroaromatic rings include, for example, pyridinyl, pyrirnidinyl, pyrazinyl, pyridazinyl, isoxazolyl, isothiazolyl, pyrazolyl, thiazolyl, oxazolyl, and imidazolyl.
  • a preferred heteroaromatic ring is pyridinyl.
  • the ring defined by R 2 may be a bicyclic, i.e. may be fused with phenyl at two of its free ring carbons. Examples of such rings are benzimidazolyl, benzothiazolyl, quinolynyl, benzooxazolyl, and so forth.
  • the ring defined by R 2 is connected via a ring carbon atom to the amide group to form the amides of formula I.
  • the ring carbon atom of the heteroaromatic ring which is connected via the amide linkage to form the compound of formula I cannot contain any substituent.
  • the preferred rings are those which contain a nitrogen heteroatom adjacent to the connecting ring carbon and a second heteroatom adjacent to the connecting ring carbon.
  • pharmaceutically acceptable salts include any salt with both inorganic or organic pharmaceutically acceptable acids such as hydrochloric acid, hydrobromic acid, nitric acid, sulfuric acid, phosphoric acid, citric acid, formic acid, maleic acid, acetic acid, succinic acid, tartaric acid, methanesulfonic acid, /? ⁇ r ⁇ -toluene sulfonic acid and the like.
  • pharmaceutically acceptable salts also includes any pharmaceutically acceptable base salt such as amine salts, trialkyl amine salts and the like. Such salts can be formed quite readily by those skilled in the art using standard techniques.
  • prodrugs of the compound of formula I are prodrugs of the compound of formula I.
  • prodrug is meant a metabolic precursor of a drug which when administered to a patient breaks down into the drug and acceptable by-products.
  • Compounds of this invention may be made into any conventional prodrug.
  • One particular prodrug of this invention are the N-oxides as described above. Any individual compound of this invention may be obtained as a prodrug in general.
  • hydrolyzable ester or ether protecting groups designates any ester or ether conventionally used for protecting carboxylic acids or alcohols which can be hydrolyzed to yield the respective carboxyl or hydroxyl group.
  • ester groups useful for those purposes are those in which the acyl moieties are derived from a lower alkanoic, aryl lower alkanoic, or lower alkane dicarboxylic acid.
  • activated acids which can be utilized to form such groups are acid anhydrides, acid halides, preferably acid chlorides or acid bromides derived from aryl or lower alkanoic acids.
  • anhydrides are anhydrides derived from monocarboxylic acid such as acetic anhydride, benzoic acid anhydride, and lower alkane dicarboxylic acid anhydrides, e.g. succinic anhydride as well as chloro formates e.g. trichloro, ethylchloro formate being preferred.
  • a suitable ether protecting group for alcohols are, for example, the tetrahydropyranyl ethers such as 4-methoxy-5,6-dihydroxy-2H-pyranyl ethers.
  • aroylmethylethers such as benzyl, benzhydryl or trityl ethers or ⁇ -lower alkoxy lower alkyl ethers, for example, methoxymethyl or allylic ethers or alkyl silylethers such as trimethylsilylether.
  • amino protecting group designates any conventional amino protecting group which can be cleaved to yield the free amino group.
  • the preferred protecting groups are the conventional amino protecting groups utilized in peptide synthesis. Especially preferred are those amino protecting groups which are cleavable under mildly acidic conditions from about pH 2 to 3. Particularly preferred amino protecting groups are t-butyl carbamate (BOC), benzyl carbamate (CBZ), and 9- fluorenylmethyl carbamate (FMOC).
  • R 1 is cycloalkyl having from 5 to 8 carbon atoms
  • R 2 is an unsubstituted or mono-substituted five- or six-membered heteroaromatic ring connected by a ring carbon atom to the amine group shown, which five- or six-membered heteroaromatic ring contains from 1 to 2 heteroatoms selected from sulfur, oxygen or nitrogen, with one heteroatom being nitrogen which is adjacent to the connecting ring carbon atom, which ring ma be a single cycle, or ma be fused with a phenyl at two of its ring carbons, said mono-substituted heteroaromatic ring being monosubstituted at a position on a ring carbon atom other than adjacent to said connecting carbon atom with a substituent selected from the group consisting of halo or lower alkyl (Formula AB).
  • R 2 as described in Formula AB may be a monocyclic ring (Formula A), or may be a bicyclic ring through fusion with phenyl (Formula B).
  • R 2 is substituted or unsubstituted pyridine.
  • R 1 is cyclohexyl.
  • Phenyl A is preferably unsubstituted.
  • R 1 is cyclohexyl and R 2 is a monocyclic ring (Formula A-l). It is preferred in compounds of Formula A-l that phenyl A is unsubstituted. It is particularly preferred that R 2 is substituted or unsubstituted pyridine.
  • R 2 is unsubstituted pyridine, and in another R 2 is a a mmoonnoo--ssuubbssttiittuutteedd ppyyririddiinnee.. PPrreeffeerraabbllyy, the substituent is halo such as bromo, fluoro or chloro or lower alkyl such as methyl.
  • R 2 is a mono-substituted pyrimidine.
  • the substituent is lower alkyl, such as methyl, and phenyl A is unsubstituted.
  • R 2 may also be an unsubstituted pyrimidine of Formula A-l.
  • phenyl A is unsubstituted or substituted with lower alkyl sulfonyl at the 4 or 7 position.
  • R 2 is unsubstituted thiazole.
  • A is phenyl unsubstituted, or substituted with chloro at positions 5 and 6, or substituted with nitro at positions 5 or 6, or substituted with halo or lower alkyl sulfonyl at positions 4 or 7.
  • R 2 is a mono-substituted thiazole.
  • the substituent is halo
  • A is phenyl unsubstituted, or substituted with chloro at positions 5 and 6, or substituted with nitro at positions 5 or 6, or substituted with halo or lower alkyl sulfonyl at positions 4 or 7.
  • R 2 is an unsubstituted pyrazine.
  • A is preferably phenyl unsubstituted, or substituted with halo or lower alkyl sulfonyl at positions 4 or 7.
  • R 1 is cylohexyl and R 2 is a monocyclic ring
  • R 2 is unsubstituted imidazole
  • phenyl and A is preferably unsubstituted phenyl.
  • phenyl A is unsubstituted
  • R 2 is a monocyclic ring, and it is preferable that R 2 is substituted or unsubstituted thiazole.
  • R 1 is cyclopentyl, in others, R 1 is cycloheptyl, and in others, R 1 is cyclooctyl.
  • R 2 is a bicyclic heteroaromatic ring through fusion with phenyl at two of its ring carbons and R 1 is cyclohexyl
  • R 1 is cyclohexyl
  • phenyl A is unsubstituted.
  • R 2 is benzthiazole, benzimidazole, benzoxazole, or quinoline, all preferably unsubstituted.
  • A is unsubstituted phenyl or phenyl which ma be substituted with fluoro, lower alkyl sulfonyl or lower alkyl thio at position 4 or 7, or with chloro at position 5 or 6 or 5 and 6, or with bromo or nitro at position 5 or 6.
  • A is unsubstituted phenyl or phenyl which may be mono- or di-substituted with halo or mono-substituted with lower alkyl sulfonyl or nitro.
  • A is unsubstituted phenyl or phenyl monosubstituted by halo, preferably by fluoro.
  • R 1 is cycloalkyl having from 3 to 9, preferably from 5 to 8 carbon atoms. Most preferable residues R are cyclopentyl or cyclohexyl.
  • R 2 is an unsubstituted or mono-substituted five- or six-membered heteroaromatic ring connected by a ring carbon atom to the amine group shown, which five- or six-membered heteroaromatic ring contains 1 or 2 heteroatoms selected from sulfur, oxygen or nitrogen, with one heteroatom being nitrogen which is adjacent to the connecting ring carbon atom, which ring is a monocyclic ring or fused with phenyl at two of its ring carbons, said mono- substituted heteroaromatic ring being monosubstituted at a position on a ring carbon atom other than adjacent to said connecting carbon atom with a substituent selected from the group consisting of halo or lower alkyl.
  • R 2 is a heteroaromatic ring selected from thiazolyl, quinolinyl, pyridyl, pyrimidyl, pyrazinyl, imidazolyl, benzoimidazolyl, benzothiazolyl or benzooxazolyl, said heteroaromatic ring being optionally monosubstituted by halo, preferably chloro or bromo, or lower alkyl, preferably methyl.
  • heteroaromatic rings residues R 2 are selected from thiazolyl, pyrimidyl, pyrazinyl or pyridyl, said heteroaromatic ring being optionally monosubstituted by halo, preferably brome or chloro, or lower alkyl, preferably methyl.
  • Most preferable residue R 2 is an unsubstituted heteroaromatic ring selected from thiazolyl, pyrimidyl, pyrazinyl or pyridyl or a monosubstituted heteroaromatic ring selected from thiazolyl substituted by chloro or pyridyl substituted by chloro, bromo or lower alkyl, preferably methyl.
  • the compounds of this invention can be prepared by the following Reaction Schemes where phenyl A, R 1 , R 2 , and R 3 are as in formula I.
  • Ra halo
  • Rb H or halo
  • the compounds of this invention may be obtained by reacting substituted ortho- ⁇ phenylene dialdehyde 1 or 1', with amino acid derivative 2 or 2' in a suitable solvent such as acetonitrile, to obtain carboxylic acid derivative 3 or 3'. 3 or 3' may then be coupled with a suitable heteroaromatic amine H 2 N-R 2 under conventional reaction conditions for amide bond formation to obtain the compounds of formula I.
  • R 1 is C 3 - C 9 cycloalkyl or C 2 - alkyl (in R, S, or racemic form) are obtained as described above where 2 or 2' is a suitable commercially available amino acid.
  • Amino acid 2 or 2' may also be obtained according to Scheme 3 from 5.
  • 5 is prepared according to the literature procedure (see O'Donnell, M.J.; Polt, R.L. /. Org. Chem. 1982, 7, 2663-2666) and may be reacted under basic conditions with a suitable alkyl halide reagent substituted with the desired R 1 to obtain, after acidic hydrolysis, any amino acid 2.
  • the alkyl halide reagent may be obtained commercially or made using conventional methods.
  • Compounds of formula I where R 2 is as described in formula I maybe obtained by coupling the desired heteroaromatic amine (which is commercially available or can be made by conventional methods) to carboxylic acid derivative 3 or 3' under conventional conditions for reacting an amine with an acid.
  • the N-oxide heteroaromatic amine for example 2-aminopyridine-N-oxide
  • this compound can be separated into these isomers by conventional physical or chemical means.
  • One physical means of separation involves resolution of the enantiomeric pairs of compounds of formula 1 using a high performance liquid chromatography instrument equiped with a chromatographic column loaded with a chiral agent.
  • the preferred chemical means is to react the intermediate carboxylic acid 3 or 3' with an optically active base. Any conventional optically active base can be utilized to carry out this resolution.
  • the preferred optically active bases are the optically active amine bases such as alpha-methylbenzylamine, quinine, dehydroabietylamine and alpha-methylnaphthylamine. Any of the conventional techniques utilized in resolving organic acids with optically active organic amine bases can be utilized in carrying out this reaction.
  • 3 or 3' is reacted with the optically active base in an inert organic solvent medium to produce salts of the optically active amine with both the R and S isomers of 3 or 3'.
  • temperatures and pressure are not critical and the salt formation can take place at room temperature and atmospheric pressure.
  • the R and S salts can be separated by any conventional method such as fractional crystallization. After crystallization, each of the salts can be converted to the respective 3 or 3' in the R and S configuration by hydrolysis with an acid.
  • the preferred acids are dilute aqueous acids , i.e., from about 0.00 IN to 2N aqueous acids, such as aqueous sulfuric or aqueous hydrochloric acid.
  • the configuration of 3 or 3' which is produced by this method of resolution is carried through the entire reaction scheme to produce the desired R or S isomer of formula I or II.
  • the separation of R and S isomers can also be achieved using an enzymatic ester hydrolysis of any lower alkyl ester derivatives of 3 or 3' (see for example, Ahmar, M.; Girard, C; Bloch, R, Tetrahedron Lett, 1989, 7053), which results in the formation of corresponding chiral acid and chiral ester.
  • the ester and the acid can be separated by any conventional method of separating an acid from an ester.
  • Another preferred method of resolution of racemates of the compounds 3 or 3' is via the formation of corresponding diastereomeric esters or amides.
  • diastereomeric esters or amides can be prepared by coupling the carboxylic acids 3 or 3 5 with a chiral alcohol or a chiral amine. This reaction can be carried out using any conventional method of coupling a carboxylic acid with an alcohol or an amine. The corresponding diastereomers of the derivatives of carboxylic acids 3 or 3' can then be separated using any conventional separation methods, such as HPLC. The resulting pure diastereomeric esters or amides can then be hydrolyzed to yield the corresponding pure R or S isomers. The hydrolysis reaction can be carried out using conventional known methods to hydrolyze an ester or an amide without racemization.
  • medicaments containing a compound of formula I are also an object of the present invention, as is a process for the manufacture of such medicaments, which process comprises bringing one or more compounds of formula I and, if desired, one or more other therapeuticaUy valuable substances into a galenical administration form, e.g. by combining a compound of formula I with a pharmaceutically acceptable carrier and/or adjuvant.
  • compositions may be administered orally, for example in the form of tablets, coated tablets, dragees, hard or soft gelatine capsules, solutions, emulsions or suspensions.
  • Administration can also be carried out rectally, for example using suppositories; locally or percutaneously, for example using ointments, creams, gels or solutions; or parenterally, e.g. intravenously, intramuscularly, subcutaneously, intrathecally or transdermally, using for example injectable solutions.
  • administration can be carried out sublingually or as an aerosol, for example in the form of a spray.
  • the compounds of the present invention may be admixed with pharmaceutically inert, inorganic or organic excipients.
  • suitable excipients for tablets, dragees or hard gelatine capsules include lactose, maize starch or derivatives thereof, talc or stearic acid or salts thereof.
  • suitable excipients for use with soft gelatine capsules include for example vegetable oils, waxes, fats, semi-solid or liquid polyols etc.; according to the nature of the active ingredients it may however be the case that no excipient is needed at all for soft gelatine capsules.
  • excipients which may be used include for example water, polyols, saccharose, invert sugar and glucose.
  • excipients which maybe used include for example water, alcohols, polyols, glycerine, and vegetable oils.
  • excipients which may be used include for example natural or hardened oils, waxes, fats and semi-solid or liquid polyols.
  • the pharmaceutical compositions may also contain preserving agents, solubilising agents, stabilising agents, wetting agents, emulsifiers, sweeteners, colorants, odorants, salts for the variation of osmotic pressure, buffers, coating agents or antioxidants. As mentioned earlier, they may also contain other therapeuticaUy valuable agents. It is a prerequisite that all adjuvants used in the manufacture of the preparations are non-toxic.
  • Preferred forms of use are intravenous, intramuscular or oral administration, most preferred is oral administration.
  • the dosages in which the compounds of formula I are administered in effective amounts depend on the nature of the specific active ingredient, the age and the requirements of the patient and the mode of application. In general, dosages of about 1-100 mg/kg body weight per day come into consideration.
  • Step A (S)-3-Cyclohexyl-2-(l-oxo-l,3-dihydro-isoindol-2-yl)-propionic acid
  • (S)-(+)- ⁇ -aminocyclohexanepropionic acid hydrate (5.00g; 29.2 mmol) and phthalic dicarboxaldehyde (4.21g; 31.3 mmol) in acetonitrile (120 mL) was refluxed for 20 h under nitrogen. The mixture was allowed to cool to room temperature and further cooled to 0°C.
  • Step B of (S)-3-cycIohexyl-2-(l-oxo-l,3-dihydro-isoindol-2-yl)-N-thiazol-2-yl- propionamide
  • (S)-3-cyclohexyl-2-(l-oxo-l,3-dihydro-isoindol-2-yl)-propionic acid prepared in Step A, 286 mg; 1.0 mmol
  • O-benzotriazol-l-yl-N,N,N,IV'- tetramethyluronium hexafluorophosphate (BOP, 500 mg; 1.1 mmol) and 2- aminothiazole (125 mg; 1.2 mmol) in dry methylene chloride (lOmL) at 0°C was added N,N-diisopropylethylamine (0.55 mL; 3.1 mmol) dropwise.
  • StepA 4,5-dichloro-l,2 -di-hydroxymethyl benzene
  • Step B 4,5-dichlorophthaHc-l,2-dicarboxaldehyde
  • Triethylamine (30 mL; 17.6 mmol) was added slowly over 15 minutes and the mixture allowed to warm to roome temperature for 2h. The mixture was diluted with cold water (150 mL) and extracted with methylene chloride. The extracts were washed with IN HC1, dried over sodium sulfate and concentrated to give 2.58g of 4,5-dichlorophthalic- 1,2 -dicarboxaldehyde as a yellow solid: ES-LRMS calcd for C 8 H 3 O 2 (M + - 1) 201, found 201.
  • Step C (S)-3-cyclohex7l-2-(5,6-dicMoro-l-oxo-l,3-dih7dro-isoindol-2-7l)-propionic acid
  • Step D (S)-3-Cyclohexyl-2-(5,6-dicUoro-l-oxo-l,3-d 7dro-isoindol-2-7l)-N-thiazol- 2-yl-propionamide BOP coupling of (S)-3-c7clohex7l-2-(5,6-dichloro-l-oxo-l,3-dih7dro-isoindol-2-
  • This compound was prepared via BOP coupling of (S)-3-c7clohexyl-2-(5,6- dichloro-l-oxo-l,3-dihydro-isoindol-2-7l)-propionic acid (prepared in Example 4, Step C; 250 mg; 0J0 mmol) and 2-amino-5-chlorothiazole rrydrochloride (154 mg; 0.88 mmol) in a manner similar to that used for the preparation of (S)-3-cyclohexyl-2-(l- oxo-l,3-dih7dro-isoindol-2-7l)-N-thiazol-2-7l-propionamide (outlined in Example 1, Step B) to provide N-(5-CHoro-thiazol-2-yl)-3-c7dohex7l-2-(5,6-dic oro-l-oxo-l,3- dih7dro-isoindol-2-7l)-
  • This compound was prepared via BOP coupling of (S)-3-cyclohex7l-2-(5,6- dicUoro-l-oxo-l,3-dih7dro-isoindol-2-yl)-propionic acid (prepared in Example 4, Step C; 248 mg; 0J0 mmol) and 2-amino-5-bromothiazole hydrochloride (154 mg; 0.89 mmol) in a manner similar to that used for the preparation of (S)-3-c7clohexyl-2-(l- oxo-l,3-dih7dro-isoindol-2-7l)-N-thiazol-2-yl-propionamide (outlined in Example 1, Step B) to provide N-(5-Bromo-thiazol-2-7l)-3-c7clohex7l-2-(5,6-dichloro-l-oxo-l,3- dih7dro-isoindol-2
  • This compound was prepared via BOP coupling of (S)-3-cyclohexyl-2-(l-oxo- l,3-dihydro-isoindol-2-yl)-propionic acid (prepared in Example 1, Step A, 287 mg; 1.0 mmol and 2-amino-benzimidazole (119 mg; 1.0 mmol) in a manner similar to that used for the preparation of (S)-3-cyclohexyl-2-(l-oxo-l,3-dihydro-isoindol-2-yl)-N-thiazol- 2-yl-propionamide (outlined in Example 9, Step B) to provide crude N-(5-Bromo- fhiazol-2-yl)-3-cyclohexyl-2-(5 ,6-dichloro- 1 -oxo- 1 ,3-dihydro-isoindol-2-yl)- propionamide.
  • the crude product was purified by reverse-phase HPLC (Rainin Dynamax SD-1 instrument) using a gradient of 10% acetonitrile/water/0.1% trifluoroacetic acid to 100% acetonitrile on a 8 column.
  • the combined fractions containing product were concentrated to remove most of the acetonitrile and then extracted with ethyl acetate.
  • This compound was prepared via BOP coupling of (S)-3-cyclohexyl-2-(l-oxo- l,3-dihydro-isoindol-2-yl)-propionic acid (prepared in Example 1, Step A, 144 mg; 0.5 mmol) and 2-amino-benzothiazole (81 mg; 0.55 mmol) in a manner similar to that used for the preparation of (S)-3-cyclohexyl-2-(l-oxo-l,3-dihydro-isoindol-2-yl)-N-thiazol- 2-yl-propionamide (outlined in Example 9, Step B) to provide crude N-Benzothiazol-2- yl-3-cyclohexyl-2-(l-oxo-l,3-dihydro-isoindol-2-yl)-propionamide.
  • Step A (R)-3-Cyclohexyl-2-(l-oxo-l,3-dihydro-isoindol-2-yl)-propionic acid
  • (R)-(+)- ⁇ -aminocyclohexanepropionic acid hydrochloride (2.69g; 15.7 mmol) and phthalic dicarboxaldehyde (2.50g; 14.6 mmol) in acetonitrile (60 mL) was refluxed for 42 h under nitrogen. The mixture was allowed to cool to room temperature and further cooled to 0°C.
  • Step B (R)-3-c7clohex7l-2-(l-oxo-l,3-dih7dro-isoindol-2-yl)-N-thiazol-2-7l- propionamide
  • This compound was prepared via BOP coupling of (S)-3-cyclohexyl-2-(l-oxo- l,3-dihydro-isoindol-2-yl)-propionic acid (prepared in Step A of Example 1; 288 mg; 1.0 mmol) and 2-aminoquinoline (180 mg; 1.2 mmol) in a manner similar to that used for the preparation of (S)-3-cyclohexyl-2-(l-oxo-l,3-dihydro-isoindol-2-yl)-N-thiazol- 2-yl-propionamide as outlined in Example 1, Step B) to provide 3-Cyclohexyl-2-(l- oxo-l,3-dihydro-isoindol-2-yl)-N-quinolin-2-yl-propionamide as a white solid in 99% yield: EI-HRMS m/e calcd for C 26 H 27 N 3 O 2 (M
  • Example 11 11.1. (S)-3-Cyclohexyl-2-(5-nitro-l-oxo-l,3-dihydro-isoindol-2-yl)-N-thiazol-2-yl - propionamide and 11.2. (S)-3-Cyclohexyl-2-(6-nitro-l-oxo-l,3-dihydro-isoindol-2- yl)-N-thiazol-2-yl-propionamide
  • StepA 4-nitro-l,2 -di-hydroxymethyl benzene
  • Step B 4-nitro-ortho-phenylene-l,2-dicarboxaldehyde
  • Triethylamine 60 mL; 426 mmol was added slowly over 15 minutes and the mixture allowed to warm to room temperature for 2h.
  • the mixture was diluted with cold water (300 mL) and extracted with methylene chloride.
  • the extracts were washed with IN HC1, dried over sodium sulfate and concentrated to give crude 4-nitro-ortho-phenylene- 1,2-dicarboxaldehyde which was further purified by flash chromatography (Biotage 40M, eluent: 35% ethyl acetate/hexanes) to give 2.5g (64%) of 4-nitro-l,2- dicarboxaldehyde which was estimated to be approximately 40% pure by NMR.
  • ES- LRMS calcd for FL ⁇ (M + - 1) 178, found 178.
  • Step C (S)-3-c7clohex7l-2-(5-nitro-l-oxo-l,3-dihydro-isoindol-2-7l)-propionic acid
  • Step D (S)-3-Cyclohexyl-2-(5-nitro-l-oxo-l,3-dihydro-isoindol-2-yl)-N-thiazol-2-yl -propionamide and (S)-3-Cyclohexyl-2-(6-nitro-l-oxo-l,3-dihydro-isoindol-2-yl)- N-thiazol-2-yl-propionamide
  • Example 13 13.1. (S)-N-(5-Chloro-thiazol-2-yl)-3-cyclohexyl-2-(4-fIuoro-l-oxo-l,3-dihydro- isoindol-2-yl)-propionamide and 13.2. (S)-N-(5-Chloro-thiazol-2-yl)-3-cyclohexyl- 2-(7-fluoro-l-oxo-l,3-dihydro-isoindol-2-yl)-propionamide
  • Step A 3-fluoro-l,2 -di-(hydroxymethyl) benzene
  • Triethylamine 35 mL; 248.6 mmol was added slowly over 15 minutes and the mixture stirred for 30 minutes at -78oC then allowed to warm to room temperature over 4h.
  • the mixture was poured into cold water (200 mL) and extracted with methylene chloride. The extracts were washed with IN HC1, brine and then dried (sodium sulfate) and concentrated to give crude 3-fluorophthalic dicarboxaldehyde which was not further purified: ES-LRMS calcd for (M ⁇ - 1) 151, found 151.
  • Step C (S)-3-c7clohex7l-2-(4-fluoro-l-oxo-l,3-dihydro-isoindol-2-7l)-propionic acid
  • Step D (S)-N-(5-Chloro-thiazol-2-7l)-3-c7clohex7l-2-(4-fluoro-l-oxo-l,3-dihydro- isomdol-2-yl)-propiffnide and (S)-N-(5-Chloro-thiazol-2-yl)-3-C7clohex7l-2-(7- fluoro- 1-oxo- 1 ,3-dih7dro-isomdol-2-7l)-propionamide
  • Step A 3-Cyclopentyl-2-(l-oxo-l,3-dihydro-isoindol-2-yl)-propionic acid
  • Step B 3-Cyclopentyl-2-(l-oxo-l,3-dihydro-isoindol-2-yl)-N-thiazol-2-yl- propionamide
  • Step B cycloheptylmethyl iodide
  • Step C 2-(Benzhydrylidene-amino)-3-cycloheptyI-propionic acid tert-butyl ester To a stirred solution of (Benzhydrylidene-amino)-acetic acid tert-butyl ester
  • Step E 3-Cycloheptyl-2-(l-oxo-l,3-dihydro-isoindol-2-yl)-propionic acid
  • Step A cyclooctylmethyl iodide
  • Step B 2-(Benzhydrylidene-amino)-3-cyclooctyl-propionic acid tert-butyl ester
  • Step D 3-Cyclooctyl-2-(l-oxo-l,3-dihydro-isoindol-2-yl)-propionic acid
  • Step E 3-Cyclooctyl-2-(l-oxo-l,3-dihydro-isoindol-2-yl)-N-thiazol-2-yl- propionamide
  • the crude product was purified by reverse phase HPLC (Rainin Dynamax SD-1 instrument) using a gradient of 0% acetonitrile/water/0.1% trifluoroacetic acid to 100% acetonitrile on a C18 column to provide 802 mg of 3-thiomethylphthalic acid.
  • Step C 3-thiomethyl- 1 ,2 -di- (hydroxymethyl) benzene
  • Triethylamine (5.5 mL; 17.4 mmol) was added dropwise and then the mixture allowed to gradually warm to room temperature and stirred for 20h. The mixture was poured into ice water the layers were separated. The extract was washed with brine and then dried (sodium sulfate) and concentrated to give crude 3-thiomethylphthalic dicarboxaldehyde which was not further purified.
  • Step E (S)-3-cyclohexyl-2-(4-methylthio-l-oxo-l,3-dihydro-isoindol-2-yl)- propionic acid
  • Step F (S)-3-cyclohexyl-2-(4-methylsulfonyl-l-oxo-l,3-dihydro-isoindol-2-yl)- propionic acid
  • Step G (S)-3-Cyclohexyl-2-(7-methylsuIfonyl-l-oxo-l,3dihydro-isoindoI-2-yl)-N- thiazol-2-yl-propionamide
  • Example 29 29.1. (S)-3-Cyclohexyl-2-(4-methylsulfonyl-l-oxo-l,3-dihydro-isoindol-2-yl)-N- pyrazin-2-yl-propionamide and 29.2. (S)-3-cyclohexyl-2-(7-methylsulfonyl-l-oxo- l,3-dihydro-isoindol-2-yl)-N-pyrazin-2-yl-propionamide
  • Example 30 30.1. (S)-3-Cyclohexyl-2-(4-methyIsulfonyl-l-oxo-l,3-dihydro-isoindol-2-yl)-N- pyrimidin-4-yl-propionamide and 30.2. (S)- 3-Cyclohexyl-2-(7-methylsulfonyl-l- oxo-l,3-dihydro-isoindol-2-yl)-N-pyrimidin-4-yl-propionamide
  • StepA 3-chloro-l,2 -di-(hydroxymethyl) benzene
  • 3-chloro-l,2 -di- (hydroxymethyl) benzene was prepared in 97% yield via borane reduction of 3-Chlorophthalic acid in a manner similar to that was used for the preparation of 3-fluoro-l,2 -di- (hydroxymethyl) benzene as described in Example 13, Step A.
  • 3-Chlorophthalic acid was prepared from according to the literature procedure of Fertel, L.B. et al. /. Org. Chem. 1993, 58(1), 261-263.
  • Step B 3-chlorophthalic dicarboxaldehyde 3-chlorophthalic dicarboxaldehyde was prepared via oxidation of 3-chloro-l,2 - di-(hydroxymethyl) benzene (prepared in Step A) in a manner similar to that used for the preparation of 3-fluorophthalic dicarboxaldehyde as described in Example 13, Step B and the crude product was used without further purification for the next step.
  • Step C (S)-3-cyclohexyl-2-(4-Chloro-l-oxo-l,3-dihydro-isoindol-2-yl)-propionic acid and :(S)-3-cyclohexyl-2-(7-Chloro-l-oxo-l,3-dihydro-isoindol-2-yl)-propionic acid
  • Step D (S)-3-Cyclohexyl-2-(4-Chloro-l-oxo-l,3-d ydro-isomdol-2-yl)-N-thiazol-2-yl- propionamide and (S)-3-Cyclohexyl-2-(7-Chloro-l-oxo-l,3dihydro-isoindol-2-yl)-N- thiazol-2-yl-propiffnide
  • Example 38 38.1. (S)-3-Cyclohexyl-2-(4-Chloro-l-oxo-l,3-dihydro-isoindol-2-yl)-N-pyridin-2- yl-propionamide and 38.2. (S)-3-Cyclohexyl-2-(7-Chloro-l-oxo-l,3dihydro- isoindol-2-yl)-N-pyridin-2-yI-propionamide
  • Example A In this manner, they increase the flux of glucose metabolism which causes increased insulin secretion. Therefore, the compounds of formula I are glucokinase activators useful for increasing insulin secretion.
  • the assay was conducted at 25° C in a flat bottom 96-well tissue culture plate from Costar (Cambridge, MA) with a final incubation volume of 120 ⁇ l.
  • the incubation mixture contained: 25 mM Hepes buffer (pH, 7.1), 25 mM KC1, 5 mM D- glucose, ImM ATP, 1.8 mM NAD, 2 mM MgCl 2 , 1 ⁇ M sorbitol-6-phosphate, 1 mM dithiothreitol, test drug or 10% DMSO, 1.8 unit/ml G6PDH, and GK (see below).
  • Glucokinase Activator in vivo S ⁇ een Protocol C57BL/6J mice are orally dosed via gavage with Glucokinase (GK) activator at 50 mg/kg body weight following a two hour fasting period. Blood glucose determinations are made five times during the six hour post-dose study period.
  • GK Glucokinase
  • GK activators are formulated at 6.76 mg/ml in Gelucire vehicle (Ethanol:Gelucire44/14:PEG400q.s. 4:66:30 v/w/v.
  • Mice are dosed orally with 7.5 ⁇ l formulation per gram of body weight to equal a 50 mg/kg dose.
  • a pre dose (time zero) blood glucose reading is acquired by snipping off a small portion of the animals tail ( ⁇ lmm) and collecting 15 ⁇ l blood into a heparinized capillary tube for analysis.
  • results are interpreted by comparing the mean blood glucose values of six vehicle treated mice with six GK activator treated mice over the six hour study duration. Compounds are considered active when they exhibit a statistically significant (p ⁇ 0.05) decrease in blood glucose compared to vehicle for two consecutive assay time points.
  • Example 1 Tablets containing the following ingredients can be produced in a conventional manner:
  • Example B Capsules containing the following ingredients can be produced in a conventional manner:

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Abstract

Isoindolin-1-one-substituted propionamide glucokinase activators which increase insulin secretion in the treatment of type II diabetes of formula (I) wherein A is unsubstituted phenyl or phenyl which is mono- or di-substituted with halo or mono-substituted with lower alkyl sulfonyl, lower alkyl thio or nitro; R1 is cycloalkyl having from 3 to 9 carbon atoms or lower alkyl having from 2 to 4 carbon atoms; R2 is an unsubstituted or mono-substituted five- or six-membered heteroaromatic ring connected by a ring carbon atom to the amine group shown, which five- or six- membered heteroaromatic ring contains from 1 to 3 heteroatoms selected from sulfur, oxygen or nitrogen, with one heteroatom being nitrogen which is adjacent to the connecting ring carbon atom, which ring may be monocyclic or fused with phenyl at two of its ring carbons, said monosubstituted heteroaromatic ring being monosubstituted at a position on a ring carbon atom other than adjacent to said connecting carbon atom with a substituent selected from the group consisting of halo, lower alkyl, nitro, cyano, perfluoro-lower alkyl; hydroxy -(CH¿2)n-OR?3, -(CH¿2?)n-C(O)-OR?3¿, -(CH¿2?)n-C(O)-NH-R?3¿, -C(O)C(O)-or3, or -(CH¿2?)n-NHR?3;¿ where R3 is hydrogen or lower alkyl; and n is 0, 1, 2, 3 or 4; or a pharmaceutically acceptable salts or N-oxides thereof.

Description

Isoindolin-1-one Gluco inase Activators
Glucokinase (GK) is one of four hexokinases that are found in mammals [Colowick, S.P., in The Enzymes, Nol. 9 (P. Boyer, ed.) Academic Press, New York, NY, pages 1-48, 1973]. The hexokinases catalyze the first step in the metabolism of glucose, i.e., the conversion of glucose to glucose-6-phosphate. Glucokinase has a limited cellular distribution, being found principally in pancreatic β-cells and liver parenchymal cells. In addition, GK is a rate-controlling enzyme for glucose metabolism in these two cell types that are known to play critical roles in whole-body glucose homeostasis [Chipkin, S.R., Kelly, K.L., and Ruderman, N.B. in Joslin's Diabetes (C.R. Khan and G.C. Wier, eds.), Lea and Febiger, Philadelphia, PA, pages 97-115, 1994]. The concentration of glucose at which GK demonstrates half-maximal activity is approximately 8 mM. The other three hexokinases are saturated with glucose at much lower concentrations (<1 mM). Therefore, the flux of glucose through the GK pathway rises as the concentration of glucose in the blood increases from fasting (5 mM) to postprandial (=10-15 mM) levels following a carbohydrate-containing meal [Printz, R.G., Magnuson, M.A., and Granner, D.K. in Ann. Rev. Nutrition Vol. 13 (R.E. Olson, D.M. Bier, and D.B. McCormick, eds.), Annual Review, Inc., Palo Alto, CA, pages 463-496, 1993]. These findings contributed over a decade ago to the hypothesis that GK functions as a glucose sensor in β-cells and hepatocytes (Meglasson, M.D. and Matschinsky, F.M. Amer. J. Physiol. 246, E1-E13, 1984). In recent years, studies in transgenic animals have confirmed that GK does indeed play a critical role in whole- body glucose homeostasis. Animals that do not express GK die within days of birth with severe diabetes while animals overexpressing GK have improved glucose tolerance (Grape, A., Hultgren, B., Ryan, A. et al., Cell 83, 69-78, 1995; Ferrie, T., Riu, E., Bosch, F. et al., EASES J., 10, 1213-1218, 1996). An increase in glucose exposure is coupled through GK in β-cells to increased insulin secretion and in hepatocytes to increased glycogen deposition and perhaps decreased glucose production. The finding that type II maturity-onset diabetes of the young (MODY-2) is caused by loss of function mutations in the GK gene suggests that GK also functions as a glucose sensor in humans (Liang, Y., Kesavan, P., Wang, L. et al., Biochem. J. 309, 167- 173, 1995). Additional evidence supporting an important role for GK in the regulation of glucose metabolism in humans was provided by the identification of patients that express a mutant form of GK with increased enzymatic activity. These patients exhibit a fasting hypoglycemia associated with an inappropriately elevated level of plasma insulin (Glaser, B., Kesavan, P., Heyman, M. et al., New England J. Med. 338, 226-230, 1998). While mutations of the GK gene are not found in the majority of patients with type II diabetes, compounds that activate GK and, thereby, increase the sensitivity of the GK sensor system will still be useful in the treatment of the hyperglycemia characteristic of all type II diabetes. Glucokinase activators will increase the flux of glucose metabolism in β-cells and hepatocytes, which will be coupled to increased insulin secretion. Such agents would be useful for treating type II diabetes.
This invention provides a compound comprising an amide of the formula:
Figure imgf000003_0001
wherein A is unsubstituted phenyl or phenyl which is mono- or di- substituted with halo or mono-substituted with lower alkyl sulfonyl, lower alkyl thio or nitro;
R1 is cycloalkyl having from 3 to 9 carbon atoms or lower alkyl having from 2 to 4 carbon atoms;
R2 is an unsubstituted or mono-substituted five- or six-membered heteroaromatic ring connected by a ring carbon atom to the amine group shown, which five- or six- membered heteroaromatic ring contains from 1 to 3 heteroatoms selected from sulfur, oxygen or nitrogen, with one heteroatom being nitrogen which is adjacent to the connecting ring carbon atom, which ring may be monocyclic or fused with phenyl at two of its ring carbons, said monosubstituted heteroaromatic ring being monosubstituted at a position on a ring carbon atom other than adjacent to said connecting carbon atom with a substituent selected from the group consisting of halo, lower alkyl, nitro, cyano, perfluoro-lower alkyl; hydroxy, -(CH2)n-OR3, -(CH2)n-C(O)- OR3, -(CH2)„-C(O)-NH-R3, -C(O)C(O)-OR3, or -(CH2)„-NHR3; where R3 is hydrogen or lower alkyl; and n is 0, 1, 2, 3 or 4; or a pharmaceutically acceptable salts or N-oxides thereof.
Preferably R2 is a five- or six-membered heteroaromatic ring connected by a ring carbon atom to the amine group shown in formula I, which five- or six-membered heteroaromatic ring contains from 1 to 3 heteroatoms selected from sulfur, oxygen or nitrogen, with one heteroatom being nitrogen which is adjacent to the connecting ring carbon atom. This ring may be monocyclic or may be fused with phenyl at two of its ring carbons. In accordance with an embodiment of this invention, the adjacent nitrogen in the nitrogen containing heteroaromatic rings may be in the form of an N- oxide where the nitrogen adjacent to the ring carbon atom is converted to an N-oxide. On the other hand, compounds of formula I can be in the form of pharmaceutically acceptable salts.
The compounds of formula I have been found to activate glucokinase in vitro.
Glucokinase activators are useful for increasing insulin secretion in the treatment of type π diabetes.
The present invention also relates to a pharmaceutical composition comprising a compound of formula I and a pharmaceutically acceptable carrier and/or adjuvant. Furthermore, the present invention relates to the use of such compounds as therapeutic active substances as well as to their use for the preparation of medicaments for the treatment or prophylaxis of type II diabetes. The present invention further relates to processes for the preparation of the compounds of formula I. In addition, the present invention relates to a method for the prophylactic or therapeutic treatment of type II diabetes, which method comprises administering a compound of formula I to a human being or an animal.
In more detail, this invention provides a compound comprising an amide of the formula I above or an N-oxide of the amide of formula I above, as well as pharmaceutically acceptable salts thereof. In the compound of formula I, the V illustrates the asymmetric carbon atom in this compound. The compound of formula I may be present as a racemate at the asymmetric carbon shown. However, the "S" enantiomers, where the amide is in the "S"configuration at the asymmetric carbon, is preferred. When the phenyl ring A is monosubstituted with lower alkyl sulfonyl, nitro or lower alkyl thio, it is preferred that it is substituted at the 5- or 6-position as indicated in formula I. Thus, when A is phenyl substituted with nitro, it is preferred that this substitution be at positions 5 or 6 such as 5-nitro phenyl and 6 nitro phenyl.
In one embodiment of formula I, the R2 ring as described above is a single, or monocyclic (unfused) ring. When R2 is a monocyclic ring, it is preferably substituted or unsubstituted pyridine. In another embodiment of formula I, the R2 ring as described above is a bicyclic ring, i.e. is fused with a phenyl.
As used throughout this application, the term "lower alkyl" includes both straight chain and branched chain alkyl groups having from 1 to 10 and preferably 3 to 9 carbon atoms, such as propyl, isopropyl, heptyl, and especially 2 to 4 carbon atoms.
As used herein, the term "cycloalkyl" signifies a 3- to 9-membered cycloalkyl ring, preferably 5- to 8-membered, for example cyclopentyl, cyclohexyl, cycloheptyl, or cyclooctyl.
As used herein, "perfluoro-lower alkyl" means any lower alkyl group wherein all of the hydrogens of the lower alkyl group are substituted or replaced by fluoro. Among the preferred perfluoro-lower alkyl groups are trifluoromethyl, pentafluoroethyl, heptafluoropropyl, etc.
As used herein, "lower alkyl thio" means a lower alkyl group as defined above bound to the rest of the molecule through the sulfur atom in a thio group.
As used herein, "lower alkyl sulfonyl" means a lower alkyl group as defined above bound to the τeY of the molecule through the sulfur atom in a sulfonyl group.
As used herein, the term "halogen" is used interchangeably with the word "halo", and, unless otherwise stated, designates all four halogens, i.e. fluorine, chlorine, bromine, and iodine. As used herein, the term "N-oxide" means a negatively charged oxygen atom which is covalently linked to a nitrogen which is positively charged in a heteroaromatic ring.
As used herein, "heteroaromatic ring" means a five or six membered unsaturated carbacyclic ring where one or more carbon is replaced by a heteroatom such as oxygen, nitrogen, or sulfur. The heteroaromatic ring may be a single cycle or may be bicyclic, i.e. formed by the fusion of two rings.
The heteroaromatic ring defined by R2 can be an unsubstituted or mono- substituted five- or six-membered heteroaromatic ring having from 1 to 3 heteroatoms selected from the group consisting of oxygen, nitrogen, or sulfur and connected by a ring carbon to the amine of the amide group shown. At least one heteroatom is nitrogen and is adjacent to the connecting ring carbon atom. If present, the other heteroatoms can be sulfur, oxygen or nitrogen. The ring defined by R2 may be a single cycle. Such heteroaromatic rings include, for example, pyridinyl, pyrirnidinyl, pyrazinyl, pyridazinyl, isoxazolyl, isothiazolyl, pyrazolyl, thiazolyl, oxazolyl, and imidazolyl. A preferred heteroaromatic ring is pyridinyl. The ring defined by R2 may be a bicyclic, i.e. may be fused with phenyl at two of its free ring carbons. Examples of such rings are benzimidazolyl, benzothiazolyl, quinolynyl, benzooxazolyl, and so forth. The ring defined by R2 is connected via a ring carbon atom to the amide group to form the amides of formula I. The ring carbon atom of the heteroaromatic ring which is connected via the amide linkage to form the compound of formula I cannot contain any substituent. When R2 is an unsubstituted or mono-substituted five-membered heteroaromatic ring, the preferred rings are those which contain a nitrogen heteroatom adjacent to the connecting ring carbon and a second heteroatom adjacent to the connecting ring carbon.
As used herein, -C(O)OR represents
Figure imgf000006_0001
and so forth.
The term "pharmaceutically acceptable salts" as used herein include any salt with both inorganic or organic pharmaceutically acceptable acids such as hydrochloric acid, hydrobromic acid, nitric acid, sulfuric acid, phosphoric acid, citric acid, formic acid, maleic acid, acetic acid, succinic acid, tartaric acid, methanesulfonic acid, /?βrα-toluene sulfonic acid and the like. The term "pharmaceutically acceptable salts" also includes any pharmaceutically acceptable base salt such as amine salts, trialkyl amine salts and the like. Such salts can be formed quite readily by those skilled in the art using standard techniques.
Also part of this invention are prodrugs of the compound of formula I. By prodrug is meant a metabolic precursor of a drug which when administered to a patient breaks down into the drug and acceptable by-products. Compounds of this invention may be made into any conventional prodrug. One particular prodrug of this invention are the N-oxides as described above. Any individual compound of this invention may be obtained as a prodrug in general.
During the course of the reactions provided below in the Reaction Scheme and discussion, the various functional groups such as the free carboxylic acid or hydroxy groups may be protected via conventional hydrolyzable ester or ether protecting groups. As used herein, the term "hydrolyzable ester or ether protecting groups" designates any ester or ether conventionally used for protecting carboxylic acids or alcohols which can be hydrolyzed to yield the respective carboxyl or hydroxyl group. Exemplary ester groups useful for those purposes are those in which the acyl moieties are derived from a lower alkanoic, aryl lower alkanoic, or lower alkane dicarboxylic acid. Among the activated acids which can be utilized to form such groups are acid anhydrides, acid halides, preferably acid chlorides or acid bromides derived from aryl or lower alkanoic acids. Examples of anhydrides are anhydrides derived from monocarboxylic acid such as acetic anhydride, benzoic acid anhydride, and lower alkane dicarboxylic acid anhydrides, e.g. succinic anhydride as well as chloro formates e.g. trichloro, ethylchloro formate being preferred. A suitable ether protecting group for alcohols are, for example, the tetrahydropyranyl ethers such as 4-methoxy-5,6-dihydroxy-2H-pyranyl ethers. Others are aroylmethylethers such as benzyl, benzhydryl or trityl ethers or α-lower alkoxy lower alkyl ethers, for example, methoxymethyl or allylic ethers or alkyl silylethers such as trimethylsilylether.
Similarly, the term "amino protecting group" designates any conventional amino protecting group which can be cleaved to yield the free amino group. The preferred protecting groups are the conventional amino protecting groups utilized in peptide synthesis. Especially preferred are those amino protecting groups which are cleavable under mildly acidic conditions from about pH 2 to 3. Particularly preferred amino protecting groups are t-butyl carbamate (BOC), benzyl carbamate (CBZ), and 9- fluorenylmethyl carbamate (FMOC). In a preferred compound of formula I, R1 is cycloalkyl having from 5 to 8 carbon atoms, and R2 is an unsubstituted or mono-substituted five- or six-membered heteroaromatic ring connected by a ring carbon atom to the amine group shown, which five- or six-membered heteroaromatic ring contains from 1 to 2 heteroatoms selected from sulfur, oxygen or nitrogen, with one heteroatom being nitrogen which is adjacent to the connecting ring carbon atom, which ring ma be a single cycle, or ma be fused with a phenyl at two of its ring carbons, said mono-substituted heteroaromatic ring being monosubstituted at a position on a ring carbon atom other than adjacent to said connecting carbon atom with a substituent selected from the group consisting of halo or lower alkyl (Formula AB). R2 as described in Formula AB may be a monocyclic ring (Formula A), or may be a bicyclic ring through fusion with phenyl (Formula B). In compounds of formula A, it is particularly preferred that R2 is substituted or unsubstituted pyridine. It is also preferred that R1 is cyclohexyl. Phenyl A is preferably unsubstituted.
In a preferred compound of Formula I, R1 is cyclohexyl and R2 is a monocyclic ring (Formula A-l). It is preferred in compounds of Formula A-l that phenyl A is unsubstituted. It is particularly preferred that R2 is substituted or unsubstituted pyridine.
In one embodiment of Formula A-l, R2 is unsubstituted pyridine, and in another R2 is a a mmoonnoo--ssuubbssttiittuutteedd ppyyririddiinnee.. PPrreeffeerraabbllyy,, the substituent is halo such as bromo, fluoro or chloro or lower alkyl such as methyl.
In one embodiment of Formula A-l, R2 is a mono-substituted pyrimidine. Preferably, the substituent is lower alkyl, such as methyl, and phenyl A is unsubstituted. R2 may also be an unsubstituted pyrimidine of Formula A-l. Preferably, phenyl A is unsubstituted or substituted with lower alkyl sulfonyl at the 4 or 7 position.
In one embodiment of Formula A-l, R2 is unsubstituted thiazole. In preferred such compounds, A is phenyl unsubstituted, or substituted with chloro at positions 5 and 6, or substituted with nitro at positions 5 or 6, or substituted with halo or lower alkyl sulfonyl at positions 4 or 7.
In one embodiment of Formula A-l, R2 is a mono-substituted thiazole. Preferably, the substituent is halo, and A is phenyl unsubstituted, or substituted with chloro at positions 5 and 6, or substituted with nitro at positions 5 or 6, or substituted with halo or lower alkyl sulfonyl at positions 4 or 7.
In one embodiment of Formula A-l, R2 is an unsubstituted pyrazine. A is preferably phenyl unsubstituted, or substituted with halo or lower alkyl sulfonyl at positions 4 or 7.
In one embodiment of Formula A-l where R1 is cylohexyl and R2 is a monocyclic ring, R2 is unsubstituted imidazole, and phenyl and A is preferably unsubstituted phenyl.
In another embodiment of Formula I or of Formula A, phenyl A is unsubstituted, R2 is a monocyclic ring, and it is preferable that R2 is substituted or unsubstituted thiazole. (Formula A-2). In some compounds of Formula A-2, R1 is cyclopentyl, in others, R1 is cycloheptyl, and in others, R1 is cyclooctyl.
In a preferred compound of Formula I where R2 is a bicyclic heteroaromatic ring through fusion with phenyl at two of its ring carbons and R1 is cyclohexyl (Formula B- 1). In compounds of Formula B-l, it is preferred that phenyl A is unsubstituted. It is further preferred that R2 is benzthiazole, benzimidazole, benzoxazole, or quinoline, all preferably unsubstituted.
In one preferable embodiment of the present invention, A is unsubstituted phenyl or phenyl which ma be substituted with fluoro, lower alkyl sulfonyl or lower alkyl thio at position 4 or 7, or with chloro at position 5 or 6 or 5 and 6, or with bromo or nitro at position 5 or 6. In another preferable embodiment, A is unsubstituted phenyl or phenyl which may be mono- or di-substituted with halo or mono-substituted with lower alkyl sulfonyl or nitro. Most preferably, A is unsubstituted phenyl or phenyl monosubstituted by halo, preferably by fluoro.
In one preferable embodiment of the present invention, R1 is cycloalkyl having from 3 to 9, preferably from 5 to 8 carbon atoms. Most preferable residues R are cyclopentyl or cyclohexyl.
In one preferable embodiment of the present invention, R2 is an unsubstituted or mono-substituted five- or six-membered heteroaromatic ring connected by a ring carbon atom to the amine group shown, which five- or six-membered heteroaromatic ring contains 1 or 2 heteroatoms selected from sulfur, oxygen or nitrogen, with one heteroatom being nitrogen which is adjacent to the connecting ring carbon atom, which ring is a monocyclic ring or fused with phenyl at two of its ring carbons, said mono- substituted heteroaromatic ring being monosubstituted at a position on a ring carbon atom other than adjacent to said connecting carbon atom with a substituent selected from the group consisting of halo or lower alkyl. In another preferable embodiment, R2 is a heteroaromatic ring selected from thiazolyl, quinolinyl, pyridyl, pyrimidyl, pyrazinyl, imidazolyl, benzoimidazolyl, benzothiazolyl or benzooxazolyl, said heteroaromatic ring being optionally monosubstituted by halo, preferably chloro or bromo, or lower alkyl, preferably methyl. More preferable heteroaromatic rings residues R2 are selected from thiazolyl, pyrimidyl, pyrazinyl or pyridyl, said heteroaromatic ring being optionally monosubstituted by halo, preferably brome or chloro, or lower alkyl, preferably methyl. Most preferable residue R2 is an unsubstituted heteroaromatic ring selected from thiazolyl, pyrimidyl, pyrazinyl or pyridyl or a monosubstituted heteroaromatic ring selected from thiazolyl substituted by chloro or pyridyl substituted by chloro, bromo or lower alkyl, preferably methyl.
Preferable compounds in accordance with the present inevntion are selected from the group consisting of:
(S)-3-cyclohexyl-2-(l-oxo-l,3-dihydro-isoindol-2-yl)-N-pyridin-2-yl- propionamide,
(S)-3-cyclohexyl-2-(4-fluoro-l-oxo-l,3-dihydro-isoindol-2-yl)-N-pyridin-2-yl- propionamide,
(S)-3-cyclohexyl-2- (7-fluoro- 1-oxo- l,3-dihydro-isoindol-2-yl)-N-pyridin-2-yl- propionamide,
(S)-3-cyclohexyl-2-(4-chloro-l-oxo-l,3-dihydro-isoindol-2-yl)-N-pyridin-2-yl- propionamide,
(S)-3-cyclohexyl-2-(7-chloro-l-oxo-l,3dihydro-isoindol-2-yl)-N-pyridin-2-yl- propionamide,
(R) -N- ( 5-bromo-pyridin-2-yl)-3-cyclohexyl-2- ( 1 -oxo- 1 ,3-dihydro-isoindol-2-yl)- propionamide, (S)-3-cyclohexyl-2-(l-oxo-l,3-dihydro-isoindol-2-yl)-N-5-chloro-pyridin-2-yl- propionamide,
(S)-3-cyclohexyl-2-(l-oxo-l,3-dihydro-isoindol-2-yl)-N-4-methyl-pyridin-2-yl- propionamide,
(S)-3-cyclohexyl-2-(l-oxo-l,3-dihydro-isoindol-2-yl)-N-5-methyl-pyridin-2-yl- propionamide,
3-cyclohexyl-2-(l-oxo-l,3-dihydro-isoindol-2-yl)-N-pyrimidin-4-yl- propionamide,
(S)-3-cyclohexyl-2-(4-methylsulfonyl-l-oxo-l,3-dihydro-isoindol-2-yl)-N- pyrimidin-4-yl-propionamide,
(S)- 3-cyclohexyl-2-(7-methylsulfonyl-l-oxo-l,3-dihydro-isoindol-2-yl)-N- pyrimidin-4-yl-propionamide,
(S)-N-3-cyclohexyl-N-(2-methyl-pyrimidin-4-yl)-2-(l-oxo-l,3-dihydro-isoindol- 2-yl) -propionamide,
(S)-3-cyclohexyl-2-(l-oxo-l,3-dihydro-isoindoI-2-yl)-N-thiazol-2-yl- propionamide,
(R)-3-cyclohexyl-2-(l-oxo-l,3-dihydro-isoindol-2-yl)-N-thiazol-2-yl- propionamide,
(S)-3-cyclohexyl-2-(5,6-dicUoro-l-oxo-l,3-dihydro-isoindol-2-yl)-N-thiazol-2- yl-propionamide,
(S)-3-cyclohexyl-2-(4-chloro-l-oxo-l,3-dihydro-isoindol-2-yl)-N-thiazol-2-yl- propionamide,
(S)-3-cyclohexyl-2-(4-fluoro-l-oxo-l,3-dihydro-isoindol-2-yl)-N-thiazol-2-yl- propionamide,
(S)-3-cyclohexyl-2-(7-fluoro-l-oxo-l,3-dihydro-isoindol-2-yl)-N-thiazol-2-yl- propionamide, (S)-3-cyclohexyl-2-(4-methylsulfonyl-l-oxo-l,3-dihydro-isoindol-2-yl)-N- thiazol-2-yl-propionamide,
(S)-3-cyclohexyl-2-(7-methylsulfonyl-l-oxo-l,3-dihydro-isoindol-2-yl)-N- thiazol-2-yl-propionamide,
(S)-3-cyclohexyl-2-(5-nitro-l-oxo-l,3-dihydro-isoindol-2-yl)-N-thiazol-2-yl - propionamide,
(S)-3-cyclohexyl-2-(6-nitro-l-oxo-l,3-dihydro-isoindol-2-yl)-N-thiazol-2-yl- propionamide,
(S)-N-(5-cHoro-miazol-2-yl)-3-cyclohexyl-2-(l-oxo-l,3-dihydro-isoindol-2-yl) propionamide,
(S)-N-(5-bromo-thiazol-2-yl)-3-cyclohexyl-2-(l-oxo-l,3-dihydro-isoindol-2-yl)- propionamide,
(S)-N-(5-chloro-thiazol-2-yl)-3-cyclohexyl-2-(5,6-dichloro-l-oxo-l,3-dihydro- isoindol-2-yl)-propionamide,
(S)-N-(5-bromo-thiazol-2-yl)-3-cyclohexyl— 2-(5,6-dichloro-l-oxo-l,3-dihydro- isoindol-2-yl)-propionamide,
(S)-N-(5-chloro-thiazol-2-yl)-3-cyclohexyl-2-(4-chloro-l-oxo-l,3-dihydro- isoindol-2-yl) -propionamide,
(S)-N-(5-chloro-thiazol-2-yl)-3-cyclohexyl-2-(7-chloro-l-oxo-l,3-dihydro- isoindol-2-yl) -propionamide,
(S)-N-(5-chloro-thiazol-2-yl)-3-cyclohexyl-2-(5-nitro-l-oxo-l,3-dihydro- isoindol-2-yl) -propionamide,
(S)-N-(5-chloro-thiazol-2-yl)-3-cyclohexyl-2-(6-nitro-l-oxo-l,3-dihydro- isoindol-2-yl) -propionamide,
(S)-N-(5-chloro-thiazol-2-yl)-3-cyclohexyl-2-(4-fluoro-l-oxo-l,3-dihydro- isoindol-2-yl)-propionamide, (S)-N-(5-chloro-thiazol-2-yl)-3-cyclohexyl-2-(7-fluoro-l-oxo-l,3-dihydro- isoindol-2 -yl) -propionamide,
(S)-3-cyclohexyl-2-(4-fluoro-l-oxo-l,3dihydro-isoindol-2-yl)-N- pyrazin-2-yl- propionamide,
(S)-3-cyclohexyl-2-(7-fluoro-l-oxo-l,3-dihydro-isoindol-2-yl)-N-pyrazin-2-yl- propionamide,
(S)-3-cyclohexyl-2-(4-methylsulfonyl-l-oxo-l,3-dihydro-isoindol-2-yl)-N- pyrazin-2-yl-propionamide,
(S)-3-cyclohexyl-2-(7-methylsulfonyl-l-oxo-l,3-dihydro-isoindol-2-yl)-N- pyrazin-2-yl-propionamide,
(S)-3-cyclohexyl-2-(l-oxo-l,3-dihydro-isoindol-2-yl)-N-pyrazin-2-yl- propionamide,
(S) -3-cyclohexyl-2- (4-chloro- 1 -oxo- 1 ,3-dihydro-isoindol-2-yl) -N-pyrazin-2-yl- propionamide,
(S)-3-cyclohexyl-N-( lH-imidazol-2-yl)-2-( l-oxo-l,3-dihydro-isoindol-2-yl) propionamide,
3-cyclopentyl-2-(l-oxo-l,3-dihydro-isoindol-2-yl)-N-thiazol-2-yl-propionamide,
N-(5-chloro-thiazol-2-yl)-3-cyclopentyl-2-(l-oxo-l,3-dihydro-isoindol-2-yl)- propionamide,
3-cycloheptyl-2- ( 1 -oxo- 1 ,3-dihydro-isoindol-2-yl) -N-thiazol-2-yl-propionamide,
N- ( 5-chloro-thiazol-2-yl) -3-cycloheptyl-2- ( 1 -oxo- 1 ,3-dihydro-isoindol-2-yl)- propionamide,
3-cyclooctyl-2-(l-oxo-l,3-dihydro-isoindol-2-yl)-N-thiazol-2-yl-propionamide,
(S)-N-benzothiazol-2-yl-3-cyclohexyl-2-(l-oxo-l,3-dihydro-isoindol-2-yl)- propionamide,
(S)-N-(lH-benzoimidazol-2-yl)-3-cyclohexyl-2-(l-oxo-l,3-dihydro-isoindol-2- yl) -propionamide, (S)-N-benzooxazol-2-yl-3-cyclohexyl-2-(l-oxo-l,3-dihydro-isoindol-2-yl)- propionamide,
(S)-3-cyclohexyl-2-(l-oxo-l,3-dihydro-isoindol-2-yl)-N-quinolin-2-yl- propionamide,
(S)-3-Cyclohexyl-2-(7-chloro-l-oxo-l,3-dihydro-isoindol-2-yl)-N-pyrazin-2-yl- propionamide,
(S)-3-cyclohexyl-2-(l-oxo-l,3-dihydro-isoindol-2-yl)-N-(l-oxy-pyridin-2-yl)- propionamide, and
(S)-3-cyclohexyl-2-(7-cUoro-l-oxo-l,3dihydro-isoindol-2-yl)-N-thiazol-2-yl- propionamide.
Most preferable compounds in accordance with the present inevntion are selected from the group consisting of:
3-Cyclohexyl-2-(l-oxo-l,3-dihydro-isoindol-2-yl)-N-pyrimidin-4-yl- propionamide,
N-(5-Chloro-thiazol-2-yl)-3-cyclopentyl-2-(l-oxo-l,3-dihydro-isoindol-2-yl)- propionamide,
(S)-3-Cyclohexyl-2-(l-oxo-l,3-dihydro-isoindol-2-yl)-N-5-chloro-pyridin-2-yl- propionamide,
(S)-3-Cyclohexyl-2-(4-fluoro-l-oxo-l,3dihydro-isoindol-2-yl)-N- pyrazin-2-yl- propionamide,
(S)-3-Cyclohexyl-2-(4-fluoro-l-oxo-l,3-dihydro-isoindol-2-yl)-N-thiazol-2-yl- propionamide,
(S)-3-Cyclohexyl-2-(l-oxo-l,3-dihydro-isoindol-2-yl)-N-pyrazin-2-yl- propionamide,
(S)-3-Cyclohexyl-2-(l-oxo-l,3-dihydro-isoindol-2-yl)-N-pyridin-2-yl- propionamide, (S)-3-cyclohexyl-2-(l-oxo-l,3-dihydro-isoindol-2-yl)-N-thiazol-2-yl- propionamide,
(S)-3-Cyclohexyl-2-(l-oxo-l,3-dihydro-isoindol-2-yl)-N-5-methyl-pyridin-2-yl- propionamide, and
(R)-N-(5-Bromo-pyridin-2-yl)-3-cyclohexyl-2-(l-oxo-l,3-dihydro-isoindol-2- yl) -propionamide.
The compounds of this invention can be prepared by the following Reaction Schemes where phenyl A, R1, R2, and R3 are as in formula I.
Reaction Schemes
Scheme 1
Figure imgf000015_0001
Figure imgf000015_0002
v 2' Scheme 2
Figure imgf000016_0001
Ra = halo, Rb = H or halo
Ra = Nitro, Rb = H
Ra = lower alkyl thio, lower alkyl sulfonyl, Rb = H
Scheme 3
Figure imgf000016_0002
The compounds of this invention may be obtained by reacting substituted ortho- ■ phenylene dialdehyde 1 or 1', with amino acid derivative 2 or 2' in a suitable solvent such as acetonitrile, to obtain carboxylic acid derivative 3 or 3'. 3 or 3' may then be coupled with a suitable heteroaromatic amine H2N-R2 under conventional reaction conditions for amide bond formation to obtain the compounds of formula I.
Compounds of formula I where phenyl A is substituted with halo (obtained from a halo phthalic acid) or nitro are obtained as described in Scheme 2 above where 4 is a suitable commercially available substituted phthalic acid. The substituted ortho- phenylene dialdehydes 1 or 1' may be prepared by reduction of the phthalic acids 4 to the diol intermediates followed by oxidation to provide 1'. Compounds of formula I where phenyl A is substituted with lower alkyl sulfonyl may be prepared starting from a phthalic acid 4 where Ra is fluoro and Rb is hydrogen by a multistep sequence:
a) conversion to the corresponding dimethyl ester with sulfuric acid in methanol
b) nucleophilic displacement of fluoride with with sodium thiomethoxide in a suitable solvent such as dimethylsulfoxide to provide 4 when Ra is lower alkyl thio,
c) reduction of the resulting phthalic acid 4 when Ra is lower alkyl thio to the diols followed by oxidation to the corresponding ortho-phenylene dialdehyde 1 when Ra is lower alkyl thio
d) reaction of the ortho-phenylene dialdehyde 1 when Ra is lower alkyl thio an amino acid 2 in refluxing acetonitrile to give a mixture of the lower alkyl thio, lower alkyl thio carboxylic acid isomers 3 and
e) coupling with H2N — R2 to provide compounds of formula I where Ra is lower alkyl thio.
Compounds of formula I where Ra is lower alkyl sulfonyl and Rb is hydrogen, can be obtained by first oxidizing the lower alkyl isomers of step (d) above with hydrogen peroxide to form the lower alkyl sulfonyl carboxylic acid of formula 3 (Ra is lower alkyl sulfonyl, Rb is hydrogen and then coupling the resulting carboxylic acid of formula 3 with H2N - R2to provide the compound of formula I where Ra is lower alkyl sulfonyl.
Compounds of formula I where R1 is C3 - C9 cycloalkyl or C2 - alkyl (in R, S, or racemic form) are obtained as described above where 2 or 2' is a suitable commercially available amino acid. Amino acid 2 or 2' may also be obtained according to Scheme 3 from 5. 5 is prepared according to the literature procedure (see O'Donnell, M.J.; Polt, R.L. /. Org. Chem. 1982, 7, 2663-2666) and may be reacted under basic conditions with a suitable alkyl halide reagent substituted with the desired R1 to obtain, after acidic hydrolysis, any amino acid 2. The alkyl halide reagent may be obtained commercially or made using conventional methods.
Compounds of formula I where R2 is as described in formula I maybe obtained by coupling the desired heteroaromatic amine (which is commercially available or can be made by conventional methods) to carboxylic acid derivative 3 or 3' under conventional conditions for reacting an amine with an acid. The N-oxide heteroaromatic amine (for example 2-aminopyridine-N-oxide) may be coupled to 3 or 3', or the corresponding compound of Formula I may be oxidized at an unsubstituted R2 ring by known methods to obtain an N-oxide.
If it is desired to produce the R or the S isomer of the compound of formula I, this compound can be separated into these isomers by conventional physical or chemical means. One physical means of separation involves resolution of the enantiomeric pairs of compounds of formula 1 using a high performance liquid chromatography instrument equiped with a chromatographic column loaded with a chiral agent. Among the preferred chemical means is to react the intermediate carboxylic acid 3 or 3' with an optically active base. Any conventional optically active base can be utilized to carry out this resolution. Among the preferred optically active bases are the optically active amine bases such as alpha-methylbenzylamine, quinine, dehydroabietylamine and alpha-methylnaphthylamine. Any of the conventional techniques utilized in resolving organic acids with optically active organic amine bases can be utilized in carrying out this reaction.
In the resolution step, 3 or 3' is reacted with the optically active base in an inert organic solvent medium to produce salts of the optically active amine with both the R and S isomers of 3 or 3'. In the formation of these salts, temperatures and pressure are not critical and the salt formation can take place at room temperature and atmospheric pressure. The R and S salts can be separated by any conventional method such as fractional crystallization. After crystallization, each of the salts can be converted to the respective 3 or 3' in the R and S configuration by hydrolysis with an acid. Among the preferred acids are dilute aqueous acids , i.e., from about 0.00 IN to 2N aqueous acids, such as aqueous sulfuric or aqueous hydrochloric acid. The configuration of 3 or 3' which is produced by this method of resolution is carried through the entire reaction scheme to produce the desired R or S isomer of formula I or II. The separation of R and S isomers can also be achieved using an enzymatic ester hydrolysis of any lower alkyl ester derivatives of 3 or 3' (see for example, Ahmar, M.; Girard, C; Bloch, R, Tetrahedron Lett, 1989, 7053), which results in the formation of corresponding chiral acid and chiral ester. The ester and the acid can be separated by any conventional method of separating an acid from an ester. Another preferred method of resolution of racemates of the compounds 3 or 3' is via the formation of corresponding diastereomeric esters or amides. These diastereomeric esters or amides can be prepared by coupling the carboxylic acids 3 or 35 with a chiral alcohol or a chiral amine. This reaction can be carried out using any conventional method of coupling a carboxylic acid with an alcohol or an amine. The corresponding diastereomers of the derivatives of carboxylic acids 3 or 3' can then be separated using any conventional separation methods, such as HPLC. The resulting pure diastereomeric esters or amides can then be hydrolyzed to yield the corresponding pure R or S isomers. The hydrolysis reaction can be carried out using conventional known methods to hydrolyze an ester or an amide without racemization.
On the basis of their capability of activating glucokinase, the compounds of above formula I can be used as medicaments for the treatment of type II diabetes. Therefore, as mentioned earlier, medicaments containing a compound of formula I are also an object of the present invention, as is a process for the manufacture of such medicaments, which process comprises bringing one or more compounds of formula I and, if desired, one or more other therapeuticaUy valuable substances into a galenical administration form, e.g. by combining a compound of formula I with a pharmaceutically acceptable carrier and/or adjuvant.
The pharmaceutical compositions may be administered orally, for example in the form of tablets, coated tablets, dragees, hard or soft gelatine capsules, solutions, emulsions or suspensions. Administration can also be carried out rectally, for example using suppositories; locally or percutaneously, for example using ointments, creams, gels or solutions; or parenterally, e.g. intravenously, intramuscularly, subcutaneously, intrathecally or transdermally, using for example injectable solutions. Furthermore, administration can be carried out sublingually or as an aerosol, for example in the form of a spray. For the preparation of tablets, coated tablets, dragees or hard gelatine capsules the compounds of the present invention may be admixed with pharmaceutically inert, inorganic or organic excipients. Examples of suitable excipients for tablets, dragees or hard gelatine capsules include lactose, maize starch or derivatives thereof, talc or stearic acid or salts thereof. Suitable excipients for use with soft gelatine capsules include for example vegetable oils, waxes, fats, semi-solid or liquid polyols etc.; according to the nature of the active ingredients it may however be the case that no excipient is needed at all for soft gelatine capsules. For the preparation of solutions and syrups, excipients which may be used include for example water, polyols, saccharose, invert sugar and glucose. For injectable solutions, excipients which maybe used include for example water, alcohols, polyols, glycerine, and vegetable oils. For suppositories, and local or percutaneous application, excipients which may be used include for example natural or hardened oils, waxes, fats and semi-solid or liquid polyols. The pharmaceutical compositions may also contain preserving agents, solubilising agents, stabilising agents, wetting agents, emulsifiers, sweeteners, colorants, odorants, salts for the variation of osmotic pressure, buffers, coating agents or antioxidants. As mentioned earlier, they may also contain other therapeuticaUy valuable agents. It is a prerequisite that all adjuvants used in the manufacture of the preparations are non-toxic.
Preferred forms of use are intravenous, intramuscular or oral administration, most preferred is oral administration. The dosages in which the compounds of formula I are administered in effective amounts depend on the nature of the specific active ingredient, the age and the requirements of the patient and the mode of application. In general, dosages of about 1-100 mg/kg body weight per day come into consideration.
This invention will be better understood from the following examples, which are for purposes of illustration and are not intended to limit the invention defined in the claims which follow thereafter.
Synthesis Examples
Example 1
(S)-3-cyclohexyl-2-(l-oxo-l,3-d ydro-isoindol-2-yl)-N-thiazol-2-yl-propionamide
Figure imgf000020_0001
Step A: (S)-3-Cyclohexyl-2-(l-oxo-l,3-dihydro-isoindol-2-yl)-propionic acid A mixture of (S)-(+)-α-aminocyclohexanepropionic acid hydrate (5.00g; 29.2 mmol) and phthalic dicarboxaldehyde (4.21g; 31.3 mmol) in acetonitrile (120 mL) was refluxed for 20 h under nitrogen. The mixture was allowed to cool to room temperature and further cooled to 0°C. The solid was filtered off and washed once with cold acetonitrile (50mL) to give 6.54g (78%) of (S)-3-Cyclohexyl-2-(l-oxo-l,3-dihydro- isoindol-2-yl)-propionic acid as a white solid: EI-HRMS m/e calcd for H2ιNO3 (M+) 287.1521, found 287.1521.
Step B: of (S)-3-cycIohexyl-2-(l-oxo-l,3-dihydro-isoindol-2-yl)-N-thiazol-2-yl- propionamide To a solution of (S)-3-cyclohexyl-2-(l-oxo-l,3-dihydro-isoindol-2-yl)-propionic acid (prepared in Step A, 286 mg; 1.0 mmol), O-benzotriazol-l-yl-N,N,N,IV'- tetramethyluronium hexafluorophosphate (BOP, 500 mg; 1.1 mmol) and 2- aminothiazole (125 mg; 1.2 mmol) in dry methylene chloride (lOmL) at 0°C was added N,N-diisopropylethylamine (0.55 mL; 3.1 mmol) dropwise. The mixture was allowed to warm to room temperature and stirred overnight. The mixture was then partitioned with water and the organic layer washed with brine, dried (MgSO4), filtered and concentrated in vacuo to give a crude residue. Flash chromatography (Biotage 40S; eluent: 3% methanol/methylene chloride) provided 325 mg (75%) of (S)-3-cyclohexyl- 2-(l-oxo-l,3-dihydro-isoindol-2-yl)-N-thiazol-2-yl-propionamide as a light brown foam: EI-HRMS m/e calcd for C2oH23N3O2S (M+) 369.1511, found 369.1513.
Example 2 (S)-N- (5-Chloro-thiazol-2-yl)-3-cyclohexyl-2- ( 1-oxo- 1 ,3-dihydro-isoindol-2-yl) propionamide
Figure imgf000021_0001
This compound was prepared via BOP coupling of (S)-3-cyclohexyl-2-(l-oxo-l,3- dihydro-isoindol-2-yl)-propionic acid (prepared in Step A of Example 1; 120 mg; 0.42 mmol) and 2-amino-5-chlorothiazole hydrochloride (90 mg; 0.51 mmol) in a manner similar to that used for the preparation of (S)-3-cyclohexyl-2-(l-oxo-l,3-dihydro- isoindol-2-yl)-N-thiazol-2-yl-propionamide as outlined in Example 1, Step B) to provide N-(5-Chloro-thiazol-2-yl)-3-cyclohexyl-2-(l-oxo-l,3-dihydro-isoindol-2-yl) propionamide as a white solid in 59% yield: EI-HRMS m/e calcd for C2oH22ClN3O2S (M+) 403.1121, found 403.1124.
Example 3
(S)-N- (5-Bromo-thiazol-2-yl)-3-cyclohexyl-2- ( 1-oxo- 1 ,3-dihydro-isoindol-2-yl)- propionamide
Figure imgf000022_0001
To a suspension of (S)-3-cyclohexyl-2-(l-oxo-l,3-dihydro-isoindol-2-yl)-N- thiazol-2-yl-propionamide (Prepared in Example 1; 21 mg; 0.06 mmol) and N- bromosuccinimide (11 mg; 0.06 mmol) in anhydrous carbon tetrachloride (1.0 mL) was added benzoyl peroxide (1 mg; 0.004 mmol). The mixture was stirred at 95°C in a sealed tube. After 1.5h, N-bromosuccinimide (2 mg) and benzoyl peroxide (1 mg) were added and the mixture stirred for 30 min. further. The mixture was allowed to cool to room temperature and the solvent removed in vacuo. The residue was taken up into ethyl acetate and washed with water. The organic extract was washed with brine, dried over sodium sulfate, filtered and concentrated in vacuo. The crude residue was purified by flash chromatography (Biotage 12S, eluent: 20% ethyl acetate / hexanes to give 15 mg (58%) ofN-(5-Bromo-thiazol-2-yl)-3-cyclohexyl-2-(l-oxo-l,3-dihydro-isoindol-2-yl)- propionamide as a grey foam: EI-HRMS m/e calcd for C20H23BrN3O2S (M+) 447.0616, found 447.0623. Example 4 (S)-3-Cyclohexyl-2-(5,6-dichloro-l-oxo-l,3-dihydro-isoindol-2-yl)-N-thiazol-2-yl- propionamide
Figure imgf000023_0001
StepA: 4,5-dichloro-l,2 -di-hydroxymethyl benzene
To a stirred solution of borane tetrahydrofuran complex (45 mL of 1.5 M solution in tetrahydrofuran diethyl ether) cooled to 0°C under nitrogen was added a solution of 4,5-dichlorophthalic acid (5.013g; 21.1 mmol) in tetrahydrofuran (35 mL) dropwise over a 20 minute period. At the end of the addition, the mixture was allowed to stir for 2.5 h at 0°C. The mixture was quenched by slow addition of methanol until gas evolution ceased. The mixture was allowed to stir at room temperature for 30 minutes and the solvent removed in vacuo. The residue was taken up into ethyl acetate, washed with saturated sodium bicarbonate solution followed by brine solution. The organic extract was dried (sodium sulfate), filtered and concentrated in vacuo to give 4.4 lg (100%) of 4,5-dichloro-l,2 -di-hydroxymethyl benzene as a white solid: ES-LRMS calcd for C8H7Cl2O2 Q - 1) 205, found 205.
Step B: 4,5-dichlorophthaHc-l,2-dicarboxaldehyde
To a stirred solution of oxalyl chloride (2.6 mL; 29.2 mmol) in anhydrous methylene chloride (35 mL) under nitrogen at -78°C was added a solution of dimethyl sulfoxide (4.2 mL; 59.1 mmol) in methylene chloride (10 mL) dropwise. The solution was stirred for 10 minutes and then a solution of 4,5-dichloro-l,2 -di-hydroxymethyl benzene (2.50g; 12.1 mmol) dissolved in 16 mLof 1:1 methylene chloride/dimethyl sulfoxide was added dropwise. The resulting mixture was stirred at -78°C for 2 h . Triethylamine (30 mL; 17.6 mmol) was added slowly over 15 minutes and the mixture allowed to warm to roome temperature for 2h. The mixture was diluted with cold water (150 mL) and extracted with methylene chloride. The extracts were washed with IN HC1, dried over sodium sulfate and concentrated to give 2.58g of 4,5-dichlorophthalic- 1,2 -dicarboxaldehyde as a yellow solid: ES-LRMS calcd for C8H3O2 (M+ - 1) 201, found 201.
Step C: (S)-3-cyclohex7l-2-(5,6-dicMoro-l-oxo-l,3-dih7dro-isoindol-2-7l)-propionic acid
A mixture of (S)-(+)-α-aminoc7clohexanepropionic acid hydrate (1.05g; 5.83 mmol) and 4,5-dichlorophthalic dicarboxalderryde (prepared in Step B; 1.25 g; 5.86 mmol) in acetonitrile (35 mL) was refluxed under argon for 72 h. The mixture was then allowed to cool and allowed to stand at room temperature for 2h. The solid was filtered off and washed once with cold acetonitrile to give 1.33g (64%) of (S)-3-cyclohexyl-2- (5,6-dichloro-l-oxo-l,3-dih7dro-isoindol-2-7l)-propionic acid as a light brown solid: EI-HRMS m/e calcd for C17Hι9Cl2NO3 (M+) 355.0742, found 355.0747.
Step D: (S)-3-Cyclohexyl-2-(5,6-dicUoro-l-oxo-l,3-d 7dro-isoindol-2-7l)-N-thiazol- 2-yl-propionamide BOP coupling of (S)-3-c7clohex7l-2-(5,6-dichloro-l-oxo-l,3-dih7dro-isoindol-2-
7l)-propionic acid (prepared in Step C; 248 mg; 0J0 mmol) and 2-aminothiazole (91 mg; 0.88 mmol) in a manner similar to that used for the preparation of (S)-3- c7clohexyl-2-(l-oxo-l,3-dih7dro-isoindol-2-7l)-N-thiazol-2-7l-propionamide (outlined in Example 1, Step B) to provide (S)-3-C7clohexyl-2-(5,6-dichloro-l-oxo-l,3-dib7"dro- isoindol-2-7l)-N-thiazol-2-7l-propionamide as a beige foam in 35% τield: EI-HRMS m/e calcd for C2oH2ιCl2N3O2S (M+) 437.0731, found 437.0725.
Example 5 (S)-N-(5-CUoro-thiazol-2-7l)-3-C7clohexyl-2-(5,6-dichloro-l-oxo-l,3-dih7dro- isoindol-2-yl)-propionamide
Figure imgf000024_0001
This compound was prepared via BOP coupling of (S)-3-c7clohexyl-2-(5,6- dichloro-l-oxo-l,3-dihydro-isoindol-2-7l)-propionic acid (prepared in Example 4, Step C; 250 mg; 0J0 mmol) and 2-amino-5-chlorothiazole rrydrochloride (154 mg; 0.88 mmol) in a manner similar to that used for the preparation of (S)-3-cyclohexyl-2-(l- oxo-l,3-dih7dro-isoindol-2-7l)-N-thiazol-2-7l-propionamide (outlined in Example 1, Step B) to provide N-(5-CHoro-thiazol-2-yl)-3-c7dohex7l-2-(5,6-dic oro-l-oxo-l,3- dih7dro-isoindol-2-7l)-propionamide as a beige solid in 37% yield: EI-HRMS m/e calcd for C20H20C13N3O2S (M+) 471.0342, found 471.0345.
Example 6
(S)-N-(5-Bromo-thiazol-2-yl)-3-cyclohexyl-2-(5,6-dichloro-l-oxo-l,3-dihydro- isoindol-2-yl)-propionamide
Figure imgf000025_0001
This compound was prepared via BOP coupling of (S)-3-cyclohex7l-2-(5,6- dicUoro-l-oxo-l,3-dih7dro-isoindol-2-yl)-propionic acid (prepared in Example 4, Step C; 248 mg; 0J0 mmol) and 2-amino-5-bromothiazole hydrochloride (154 mg; 0.89 mmol) in a manner similar to that used for the preparation of (S)-3-c7clohexyl-2-(l- oxo-l,3-dih7dro-isoindol-2-7l)-N-thiazol-2-yl-propionamide (outlined in Example 1, Step B) to provide N-(5-Bromo-thiazol-2-7l)-3-c7clohex7l-2-(5,6-dichloro-l-oxo-l,3- dih7dro-isoindol-2-7l) -propionamide as a beige solid in 40% vield: EI-HRMS m/e calcd for C20H2oBrCl2N3O2S (M+) 514.9837, found 514.9836.
Example 7 (S)-N-(lH-Benzoimidazol-2-yl)-3-cyclohexyl-2-(l-oxo-l,3-dihydro-isoindol-2-yl)- propionamide
Figure imgf000026_0001
This compound was prepared via BOP coupling of (S)-3-cyclohexyl-2-(l-oxo- l,3-dihydro-isoindol-2-yl)-propionic acid (prepared in Example 1, Step A, 287 mg; 1.0 mmol and 2-amino-benzimidazole (119 mg; 1.0 mmol) in a manner similar to that used for the preparation of (S)-3-cyclohexyl-2-(l-oxo-l,3-dihydro-isoindol-2-yl)-N-thiazol- 2-yl-propionamide (outlined in Example 9, Step B) to provide crude N-(5-Bromo- fhiazol-2-yl)-3-cyclohexyl-2-(5 ,6-dichloro- 1 -oxo- 1 ,3-dihydro-isoindol-2-yl)- propionamide. The crude product was purified by reverse-phase HPLC (Rainin Dynamax SD-1 instrument) using a gradient of 10% acetonitrile/water/0.1% trifluoroacetic acid to 100% acetonitrile on a 8 column. The combined fractions containing product were concentrated to remove most of the acetonitrile and then extracted with ethyl acetate. The extracts were dried (sodium sulfate) and concentrated in vacuo to give 240 mg (60%) of N-(lH-Benzoimidazol-2-yl)-3-cyclohexyl-2-(l-oxo- l,3-dihydro-isoindol-2-yl)-propionamide as a white solid: EI-HRMS m/e calcd for C24H26N4O2 (M+) 402.2056, found 402.2056.
Example 8 (S)"N-Benzothiazol-2-yl-3-cyclohexyl-2-(l-oxo-l,3-dihydro-isoindol-2-yl)- propionamide
Figure imgf000027_0001
This compound was prepared via BOP coupling of (S)-3-cyclohexyl-2-(l-oxo- l,3-dihydro-isoindol-2-yl)-propionic acid (prepared in Example 1, Step A, 144 mg; 0.5 mmol) and 2-amino-benzothiazole (81 mg; 0.55 mmol) in a manner similar to that used for the preparation of (S)-3-cyclohexyl-2-(l-oxo-l,3-dihydro-isoindol-2-yl)-N-thiazol- 2-yl-propionamide (outlined in Example 9, Step B) to provide crude N-Benzothiazol-2- yl-3-cyclohexyl-2-(l-oxo-l,3-dihydro-isoindol-2-yl)-propionamide. The crude product was purified by flash chromatography (Merck Silica gel 60, 230-400 mesh, eluent: 35% ethyl acetate/hexanes) to give 185 mg (44%) of N-Benzothiazol-2-yl-3-cyclohexyl-2-(l- oxo-l,3-dihydro-isoindol-2-yl)-propionamide as a white solid: EI-HRMS m/e calcd for C24H25N3O2S (M+) 419.1667, found 419.1661.
Example 9
(R)-3-cyclohexyl-2- ( 1 -oxo- l,3-d ydro-isoindol-2-yl)-N-tHazol-2-yl-propionamide
Figure imgf000027_0002
Step A: (R)-3-Cyclohexyl-2-(l-oxo-l,3-dihydro-isoindol-2-yl)-propionic acid A mixture of (R)-(+)-α-aminocyclohexanepropionic acid hydrochloride (2.69g; 15.7 mmol) and phthalic dicarboxaldehyde (2.50g; 14.6 mmol) in acetonitrile (60 mL) was refluxed for 42 h under nitrogen. The mixture was allowed to cool to room temperature and further cooled to 0°C. The solid was filtered off and washed once with cold acetonitrile to give 2.65g (63%) of (R)-3-Cyclohexyl-2-(l-oxo-l,3-dihydro- isoindol-2-yl)-propionic acid as a white solid: EI-HRMS m/e calcd for Cι7H21NO3 (M*) 287.1521, found 287.1523.
Step B: (R)-3-c7clohex7l-2-(l-oxo-l,3-dih7dro-isoindol-2-yl)-N-thiazol-2-7l- propionamide
To a solution of (R)-3-cyclohexyl-2-(l-oxo-l,3-dihydro-isoindol-2-yl)-propionic acid (prepared in Step A, 144 mg; 0.5 mmol), O-benzotriazol~l-yl-N,N,N',N- tetramethyluronium hexafluorophosphate (BOP, 268 mg; 0.55 mmol) and 2- aminothiazole (50 mg; 0.5 mmol) in dry methylene chloride (3 mL) at room temperature was added N,N-diisopropylethylamine (0.20 mL; 1.15 mmol) dropwise. The mixture was allowed to stir f or 1 h . The mixture was then diluted with methylene chloride and washed with water. The organic layer was dried (Νa2SO4), filtered and concentrated in vacuo to give a crude residue. Flash chromatography (Merck Silica gel 60, 230-400 mesh, eluent: 30% ethyl acetate/hexanes) provided 150 mg (81%) of (R)-3- cyclohexyl-2-(l-oxo-l,3-dihydro-isoindol-2-yl)-N-thiazol-2-yl-propionamide as an off white foam: EI-HRMS m/e calcd for C20H23N3O2S (M+) 369.1511, found 369.1511.
Example 10
(S)-3-C7clohex7l-2-(l-oxo-l,3-dm7dro-isoindol-2-7l)-N-quinolin-2-7l-propionamide
Figure imgf000028_0001
This compound was prepared via BOP coupling of (S)-3-cyclohexyl-2-(l-oxo- l,3-dihydro-isoindol-2-yl)-propionic acid (prepared in Step A of Example 1; 288 mg; 1.0 mmol) and 2-aminoquinoline (180 mg; 1.2 mmol) in a manner similar to that used for the preparation of (S)-3-cyclohexyl-2-(l-oxo-l,3-dihydro-isoindol-2-yl)-N-thiazol- 2-yl-propionamide as outlined in Example 1, Step B) to provide 3-Cyclohexyl-2-(l- oxo-l,3-dihydro-isoindol-2-yl)-N-quinolin-2-yl-propionamide as a white solid in 99% yield: EI-HRMS m/e calcd for C26H27N3O2 (M+) 413.2103, found 413.2103.
Example 11 11.1. (S)-3-Cyclohexyl-2-(5-nitro-l-oxo-l,3-dihydro-isoindol-2-yl)-N-thiazol-2-yl - propionamide and 11.2. (S)-3-Cyclohexyl-2-(6-nitro-l-oxo-l,3-dihydro-isoindol-2- yl)-N-thiazol-2-yl-propionamide
Figure imgf000029_0001
StepA: 4-nitro-l,2 -di-hydroxymethyl benzene
To a stirred solution of borane.tetrahydrofuran complex (70 mL of 1.5 M solution in tetrahydrofuran/diethyl ether) cooled to 0°C under nitrogen was added a solution of 4-nitrophthalic acid (7.01g; 33.2 mmol) in tetrahydrofuran (50 mL) dropwise over a 20 minute period. At the end of the addition, the mixture was allowed to stir for 3.5 h at 0°C. The mixture was allowed to warm to room temperature and then refluxed for 18h. The mixture was allowed to cool to room temperature, quenched with methanol and concentrated in vacuo. The residue was taken up into ethyl acetate, washed with saturated sodium bicarbonate solution followed by brine solution. The organic extract was dried (sodium sulfate), filtered and concentrated in vacuo to give 5.61g (92%) of 4- nitro-1,2 -di-hydroxymethyl benzene as a white solid: ES-LRMS calcd for C8H8NO4 (M* - 1) 182, found 182.
Step B: 4-nitro-ortho-phenylene-l,2-dicarboxaldehyde
To a stirred solution of oxalyl chloride (4.90 mL; 55.0 mmol) in anhydrous methylene chloride (60 mL) under nitrogen at -78°C was added a solution of dimethyl sulfoxide (8.20 mL; 115 mmol) in methylene chloride (20 mL) dropwise. The solution was stirred for 10 minutes and then a solution of 4-nitro-l,2-di-(hydroxymethyl) benzene (3.99g; 21.8 mmol) dissolved in 20 mL of 1:1 methylene chloride/dimethyl sulfoxide was added dropwise. The resulting mixture was stirred at -78°C for 3 h . Triethylamine (60 mL; 426 mmol) was added slowly over 15 minutes and the mixture allowed to warm to room temperature for 2h. The mixture was diluted with cold water (300 mL) and extracted with methylene chloride. The extracts were washed with IN HC1, dried over sodium sulfate and concentrated to give crude 4-nitro-ortho-phenylene- 1,2-dicarboxaldehyde which was further purified by flash chromatography (Biotage 40M, eluent: 35% ethyl acetate/hexanes) to give 2.5g (64%) of 4-nitro-l,2- dicarboxaldehyde which was estimated to be approximately 40% pure by NMR. ES- LRMS calcd for FL ^ (M+ - 1) 178, found 178.
Step C: (S)-3-c7clohex7l-2-(5-nitro-l-oxo-l,3-dihydro-isoindol-2-7l)-propionic acid
A mixture of (S)-(+)-α-aminoc7clohexanepropionic acid Irydrate (0J08 g; 3.93 mmol) and 4-nitrophthalic dicarboxaldehyde (prepared in Step B; 2.02g; 3.95 mmol) in acetonitrile (20 mL) was heated to reflux under argon. An additional quantity of (S)- (+)-α-aminoc7clohexanepropionic acid hydrate (0J75 g; 4.30 mmol) was added portionwise over a 2 hour period and the mixture allowed to reflux overnight. The mixture was allowed to cool to room temperature and the solid filtered off and washed once with cold acetonitrile to give a beige solid (0.51 lg) consisting of (S)-3-c7clohexvl- 2-(5-nitro-l-oxό-l,3-dih7dro-isoindol-2-7l)-propionic acid together with regio- isomeric (S)-3-c7clohex7l-2-(6-nitro-l-oxo-l,3-dih7dro-isoindol-2-7l)-propionic acid in a ratio of 1:2.7. The filtrate was then concentrated in vacuo and the residue recrystallized from acetonitrile to give a second crop of product (l.Olg) which appeared to be further enriched with (S)-3-c7clohexyl-2-(5-nitro- 1-oxo- l,3-dih7dro-isoindol-2- 7l)-propionic acid. The mixture had ES-LRMS calcd for Cι7Hι9N2O5 (M+ - 1) 331, found 331.
Step D: (S)-3-Cyclohexyl-2-(5-nitro-l-oxo-l,3-dihydro-isoindol-2-yl)-N-thiazol-2-yl -propionamide and (S)-3-Cyclohexyl-2-(6-nitro-l-oxo-l,3-dihydro-isoindol-2-yl)- N-thiazol-2-yl-propionamide
BOP coupling of (S)-3-cyclohexyl-2-(5-nitro-l-oxo-l,3-dihydro-isoindol-2-yl)- propionic acid (ca. 1:1 mixture of regioisomers, prepared in Step C; 301 mg; 0.91 mmol) and 2-aminothiazole (116 mg; 1.12 mmol) in a manner similar to that used for the preparation of (S)-3-cyclohexyl-2-(l-oxo-l,3-dihydro-isoindol-2-yl)-N-thiazol-2-yl- propionamide (as outlined in Example 1, Step B) provided after chromatography (Biotage 40M, eluent: 30% ethyl acetate / hexanes) 131 mg of 3-Cyclohexyl-2-(5-nitro- l-oxo-l,3-dihydro-isoindol-2-yl)-N-thiazol-2-yl-propionamide: EI-HRMS m/e calcd for C20H22N4O4S (M+) 414.1362, found 414.1362 and 121 mg of regioisomeric 3- Cyclohexyl-2-(6-nitro-l-oxo-l,3-dihydro-isoindol-2-yl)-N-thiazol-2-yl-propionamide: EI-HRMS m/e calcd for C20H22N4O4S (M+) 414.1362, found 414.1368.
Example 12
12.1. (S)-N-(5-Chloro-thiazol-2-yl)-3-cyclohexyI-2-(5-nitro-l-oxo-l,3-dihydro- isoindoI-2-yl)-propionamide and 12.2. (S)-N-(5-Chloro-thiazol-2-yl)-3-cyclohexyl- 2-(6-nitro-l-oxo-l,3-dihydro-isoindol-2-yl)-propionamide
Figure imgf000031_0001
BOP coupling of ((S)-3-cyclohexyl-2-(5-nitro-l-oxo-l ,3-dihydro-isoindol-2-yl)- propionic acid (ca. 1:1 mixture of 5,6-regioisomers, prepared in Step C; 307 mg; 0.92 mmol) and 2-amino-5-chlorothiazole hydrochloride (360 mg; 2.04 mmol) in a manner similar to that used for the preparation of (S)-3-cyclohexyl-2-(l-oxo-l,3-dihydro- isoindol-2-yl)-N-thiazol-2-yl-propionamide (as outlined in Example 1, Step B) provided after chromatography, (Biotage 40M, eluent: 25% ethyl acetate / hexanes) 134 mg of (S)- N-(5-Chloro-thiazol-2-yl)-3-cyclohexyl-2-(5-nitro-l-oxo-l,3-dihydro- isoindol-2-yl)-ρropionamide: EI-HRMS m/e calcd for C20H21C1N4O4S (M+) 448.0972, found 448.0970 and 111 mg of regioisomeric (S)-N-(5-Chloro-thiazol-2-yl)-3- cyclohexyl-2-(6-nitro-l-oxo-l,3-dihydro-isoindol-2-yl)-propionamide: EI-HRMS m/e calcd for C20H21C1N4O4S (M+) 448.0972, found 448.0972. Example 13 13.1. (S)-N-(5-Chloro-thiazol-2-yl)-3-cyclohexyl-2-(4-fIuoro-l-oxo-l,3-dihydro- isoindol-2-yl)-propionamide and 13.2. (S)-N-(5-Chloro-thiazol-2-yl)-3-cyclohexyl- 2-(7-fluoro-l-oxo-l,3-dihydro-isoindol-2-yl)-propionamide
Figure imgf000032_0001
Step A: 3-fluoro-l,2 -di-(hydroxymethyl) benzene
To a stirred solution of borane.tetrahydrofuran complex (50 mL of 1.5 M solution in tetrahydrofuran diethyl ether) cooled to 0°C under argon was added a solution of 3- fluorophthalic acid (4.51g; 24.0 mmol) in tetrahydrofuran (40 mL) dropwise over a 15 minute period. At the end of the addition, the mixture was allowed to stir for 2 h at 0°C. The mixture was allowed to warm to room temperature and then refluxed for 20h. The mixture was allowed to cool to room temperature, quenched with methanol (30mL) and concentrated in vacuo. The residue was taken up into ethyl acetate (150 mL), washed with saturated sodium bicarbonate solution. The aqueous layer was further extracted with ethyl acetate (2 X 125 mL) and the combined extracts were washed with brine solution. The organic extract was dried (sodium sulfate), filtered and concentrated in vacuo to give 3J3g (99%) of 3-fluoro-l,2 -di-(hydroxymethyl) benzene as a white solid: ES-LRMS calcd for C8H8FO2 (M+ - 1) 155, found 155.
Step B: 3-fluorophthalic dicarboxaldehyde
To a stirred solution of oxalyl chloride (2.80 mL; 31.5 mmol) in anhydrous methylene chloride (35 mL) under nitrogen at -78°C was added a solution of dimethyl sulfoxide (4.6 mL; 64.7 mmol) in methylene chloride (10 mL) dropwise. The solution was stirred for 30 minutes and then a solution of 3-fluoro-l,2 -di-hydroxymethyl benzene (2.00g; 12.8 mmol) dissolved in 20 mL of 1:1 methylene chloride/dimethyl sulfoxide was added dropwise. The resulting mixture was stirred at -78°C for 2.5 h . Triethylamine (35 mL; 248.6 mmol) was added slowly over 15 minutes and the mixture stirred for 30 minutes at -78oC then allowed to warm to room temperature over 4h. The mixture was poured into cold water (200 mL) and extracted with methylene chloride. The extracts were washed with IN HC1, brine and then dried (sodium sulfate) and concentrated to give crude 3-fluorophthalic dicarboxaldehyde which was not further purified: ES-LRMS calcd for
Figure imgf000033_0001
(M÷ - 1) 151, found 151.
Step C: (S)-3-c7clohex7l-2-(4-fluoro-l-oxo-l,3-dihydro-isoindol-2-7l)-propionic acid
A mixture of (S)-(+)-α-aminocyclohexanepropionic acid hydrate (0.565 g; 3.14 mmol) and 3-fluorophthalic dicarboxaldehyde (prepared in StepB; 1.60g; 3.16 mmol) in acetonitrile (20 mL) was heated to reflux under argon. An additional quantity of (S)- (+)-α-aminoc7clohexanepropionic acid rrydrate (0.437 g; 2.43 mmol) was added portionwise over a 7 hour period and the mixture allowed to reflux for 72h. The mixture was allowed to cool to room temperature for 3h and then stored in the fridge for lh. The solid was filtered off and washed once with cold acetonitrile to give a white solid (1.39g, 77%) consisting of (S)-3-cyclohexyl-2-(4-fluoro- 1-oxo- 1,3-dilrydro- isoindol-2-7l)-propionic acid together with regio-isomeric (S)-3-c7clohexyl-2-(7- fluoro-l-oxo-l,3-dih7dro-isoindol-2-7l)-propionic acid in a ratio of about 1:1: ES- LRMS calcd for C17Hι9FNO3 (M+ - 1) 304, found 304.
Step D: (S)-N-(5-Chloro-thiazol-2-7l)-3-c7clohex7l-2-(4-fluoro-l-oxo-l,3-dihydro- isomdol-2-yl)-propionarnide and (S)-N-(5-Chloro-thiazol-2-yl)-3-C7clohex7l-2-(7- fluoro- 1-oxo- 1 ,3-dih7dro-isomdol-2-7l)-propionamide
BOP coupling of (S)-3-cyclohexyl-2-(4-fluoro-l-oxo-l,3-dihydro-isoindol-2-yl)- propionic acid (ca. 1:1 mixture of regioisomers, prepared in Step C; 501 mg; 1.64 mmol) and 2-amino-5-chlorothiazole hydrochloride (643 mg; 3.64 mmol) in a manner similar to that used for the preparation of (S)-3-cyclohexyl-2-(l-oxo-l,3-dihydro- isoindol-2-yl)-N-thiazol-2-yl-propionamide as outlined in Example 9, Step B) provided after normal phase HPLC (Waters Prep. 500, loaded on column with methylene chloride, eluent: 20% ethyl acetate / hexanes) 194 mg of (S)-N-(5-Chloro-thiazol-2-yl)- 3 -cyclohexyl-2-(4-fluoro- 1 -oxo- 1 ,3-dihydro-isoindol-2-yl)-propionarnide: EI-HRMS m/e calcd for C 0H2ιClFN3O2S (M+) 421.1027, found 421.1024; and 173 mg of regioisomeric (S)-N-(5-Chloro-thiazol-2-yl)-3-cyclohexyl-2-(7-fluoro-l-oxo-l,3- dihydro-isoindol-2-yl)-proρionamide: EI-HRMS m/e calcd for C20H21C1FN3O2S (M*) 421.1027, found 421.1031.
Example 14
3-Cyclohexyl-2-(l-oxo-l,3-dm7dro-isoindol-2-7l)-N-pyrimidin-4-7l-propionamide
Figure imgf000034_0001
BOP coupling of (S)-3-C7clohex7l-2-(l-oxo-l,3-dih7dro-isoindol-2-7l)-propionic acid (prepared in Example 1, Step A; 287 mg; 1.00 mmol) and 4-aminopyτimidine (108 mg; 1.14 mmol) in a manner similar to that used for the preparation of (R)-3- c7clohexyl-2-(l-oxo-l,3-dih7dro-isoindol-2-7l)-N-thiazol-2-7l-propionamide (outlined in Example 9, Step B) provided after flash chromatograp ry (Merck Silica gel 60, 230-400 mesh, eluent: 50% etlryl acetate / hexanes) 271 mg (74%)of 3-C7clohex l-2-( 1-oxo- 1,3- dih7dro-isoindol-2-7l)-N-pτrimidin-4-7l-propionamide as a white foam: EI-HRMS m/e calcd for C21H24N4O2 (M+) 364.1899, found 364.1893.
Example 15
(S)-3-C7clohexyl-2-(l-oxo-l,3-d 7dro-isoindol-2-7l)-N-p7razin-2-yl-propionamide
Figure imgf000034_0002
BOP coupling of (S)-3-C7clohexyl-2-(l-oxo-l,3-dih7dro-isoindol-2-7l)-propionic acid (prepared in Example 1, Step A; 287 mg; 1.00 mmol) and 2-aminop7razine (95 mg; 1.00 mmol) in a manner similar to that used for the preparation of (R)-3-c7clohex7l-2- (l-oxo-l,3-dih7dro-isoindol-2-7l)-N-thiazol-2-7l-propionamide (outlined in Example 9, Step B) provided after flash chromatograplry (Merck Silica gel 60, 230-400 mesh, eluent: 50% etlryl acetate / hexanes) 350 mg (96%)of (S)-3-Cydohe3ryl-2-(l-oxo-l,3- dih7dro-isoindol-2-7l)-N-pyrazin-2-7l-propionamide as a white foam: EI-HRMS m/e calcd for C2ιH24N4O2 (M+) 364.1899, found 364.1908.
Example 16
(S)-N-Benzooxazol-2-7l-3-cyclohex7l-2-(l-oxo-l,3-dih7dro-isoindol-2-7l)- propionamide
Figure imgf000035_0001
BOP coupling of (S)-3-Cyclohexyl-2-(l-oxo-l,3-dih7dro-isoindol-2-7l)-propionic acid (prepared in Example 1, Step A; 144 mg; 0.50 mmol) and 2-aminobenzoxazole (67 mg; 0.50 mmol) in a manner similar to that used for the preparation of (R)-3- c7clohex7l-2-(l-oxo-l,3-dih7dro-isoindol-2-7l)-N-thiazol-2-7l-propionamide (outlined in Example 9, Step B) provided after flash chromatograprry (Merck Silica gel 60, 230-400 mesh, eluent: 50% etibyl acetate / hexanes) 161 mg (96%)of (S)-N-Benzooxazol-2-yl-3- c7clohexyl-2-(l-oxo-l,3-dih7dro-isoindol-2-7l)-propionamide as a white foam: EI- HRMS m/e calcd for C2 H25N3O3 (M+) 403.1896, found 403.1895. Example 17
3-C7clopent7l-2-(l-oxo-l,3-dih7dro-isoindol-2-7l)-N-thiazol-2-7l-propionamide
Figure imgf000036_0001
Step A: 3-Cyclopentyl-2-(l-oxo-l,3-dihydro-isoindol-2-yl)-propionic acid
A mixture of 2-Amino-3-c7clopent7l-propionic acid (O.δOOg; 5.09 mmol) and phthalic dicarboxaldehyde (0.684g; 5.10 mmol) in acetonitrile (30 mL) was refluxed for 3 h under nitrogen. The mixture was allowed to cool to room temperature and the solid was filtered off and washed once with cold acetonitrile (5mL) to give 1.16g (83%) of 3- C7clopentyl-2-(l-oxo-l,3-dih7dro-isoindol-2-7l)-propionic acid as a white solid : EI- HRMS m/e calcd for C16H19NO3 (M+) 273.1365, found 273.1374.
Step B : 3-Cyclopentyl-2-(l-oxo-l,3-dihydro-isoindol-2-yl)-N-thiazol-2-yl- propionamide BOP coupling of (3-C7clopentyl-2-(l-oxo-l,3-dihydro-isoindol-2-7l)-propionic acid (prepared in Step A; 273 mg; 1.00 mmol) and 2-aminothiazole (100 mg; 1.00 mmol) in a manner similar to that used for the preparation of (R)-3-c7clohexτl-2-(l- oxo-l,3-dih7dro-isoindol-2-7l)-N-thiazol-2-7l-propionamide (outlined in Example 9, Step B) provided after flash chromatograprry (Merck Silica gel 60, 230-400 mesh, eluent: 40% ethyl acetate / hexanes) 132 mg (37%)of 3-Cyclopentyl-2-(l-oxo-l,3-dihydro- isoindol-2-7l)-N-thiazol-2-7l-propionamide as a white solid: ES-HRMS m/e calcd for Cι9H21N3O2SNa (M++ Na+) 378.1247, found 378.1250. Example 18
N-(5-Chloro-thiazol-2-7l)-3-c7clopentyl-2-(l-oxo-l,3-dihydro-isoindol-2-7l)- propionamide
Figure imgf000037_0001
BOP coupling of 3-Cydopentyl-2-(l-oxo-l,3-dmydro-isoindol-2-7l)-propionic acid (prepared in Example 1, Step A; 277 mg; l.Olmmol) and 2-amino-5-chlorothiazole hydrochloride (397 mg; 2.30 mmol) in a manner similar to that used for the preparation of (S)-3-cyclohexyl-2-(l-oxo-l,3-dih7dro-isoindol-2-7l)-N-thiazol-2-7l-propionamide as outlined in Example 1, Step B) provided after Flash chromatography (Biotage 40M eluent: 20% etlryl acetate / hexanes) 290 mg (74%) of N-(5-Chloro-thiazol-2-yl)-3- c7clopentyl-2-(l-oxo-l,3-dih7dro-isoindol-2-7l)-propionamide as a light 7ellow solid: EI-HRMS m/e calcd for Cι9H2ιN3O2S (M+) 389.0965, found 389.0966.
Example 19
3-Cycloheptyl-2-(l-oxo-l,3-dihydro-isoindol-2-yl)-N-thiazol-2-yl-propionamide
Figure imgf000037_0002
Step A: cycloheptane methanol
To a stirred solution of borane tetrahydrofuran complex (95 mL of 1.5 M solution in tetrahydrofuran / ether) under argon at 0°C was added cycloheptanecarboxylic acid (10.05g; 69.3 mmol) in 30 mL tetrahydrofuran. After 2h, the mixture was quenched by careful addition of methanol and the mixture concentrated in vacuo. The residue was taken up into ethyl acetate and washed with successively with IN HC1, saturated sodium bicarbonate and brine solutions. The organic layer was dried (sodium sulfate) filtered and concentrated in vacuo to give 9.19g (100%) of cycloheptane methanol as a colorless oil.
Step B: cycloheptylmethyl iodide
To a stirred solution of triphenylphosphine (24.59g; 92.8 mmol) and imidazole (6.40g; 93.1 mmol) in methylene chloride (100 mL) cooled to 0°C and Iodine (23.52g; 92.7 mmol) was added portionwise over a 10 minute period. A solution of cycloheptane methanol (9.14g; 71.3 mmol) dissolved in methylene chloride (50 mL) was then added over a 5 minute period. The cooling bath was removed and the mixture allowed to warm to room temperature and stirred overnight. The mixture was diluted with methylene chloride, washed with water and the organic layer dried (magnesium sulfate), filtered and concentrated in vacuo. The crude product was chromatographed (eluentihexanes) to give 15.35g (93%) of cycloheptylmethyl iodide as an oil.
Step C: 2-(Benzhydrylidene-amino)-3-cycloheptyI-propionic acid tert-butyl ester To a stirred solution of (Benzhydrylidene-amino)-acetic acid tert-butyl ester
(2.56g; 8.68 mmol) in 30 mL of tetrahydrofuran under argon at -78°C was added lithium diisopropylamide solution (10.0 mL; 1.5 M solution in cyclohexane) dropwise. After 30 minutes, a solution of cycloheptylmethyl iodide (Prepared in Step B; 3.48g; 14.6 mmol) in 20 mL tetrahydrofuran was added dropwise and the mixture allowed to warm to room temperature and stirred for 18 h. The mixture was quenched with saturated ammonium chloride solution (100 mL). The layers were separated and the aqueous layer was extracted with ethyl acetate. The combined organic layers were dried (sodium sulfate) filtered and concentrated in vacuo. The crude product was chromatographed (Biotage 40M; eluent:5% ethyl acetate/hexanes) to give 2.56g (73%) of 2- (Benzhydrylidene-amino)-3-cycloheptyl-propionic acid tert-butyl ester as a pale yellow oil. Step D: 2-Amino-3-cycloheptyl-propionic acid
To a solution of 2-(Benzhydrylidene-amino)-3-cycloheptyl-propionic acid tert- butyl ester (1.34g; 3.31 mmol) in methanol (5 mL) was added ION HC1 solution (15 mL) and the mixture heated to reflux. After 15h, the mixture was allowed to cool to room temperature and transferred to a separatory funnel and washed with ethyl acetate. The aqueous layer was then neutralized with concentrated ammonium hydroxide solution and the white solid was filtered off and air dried to give 329 mg of 2-Amino-3- cycloheptyl-propionic acid.
Step E: 3-Cycloheptyl-2-(l-oxo-l,3-dihydro-isoindol-2-yl)-propionic acid
A solution of phthalic dicarboxaldehyde (248 mg; 1.80mmol) and 2-Amino-3- cycloheptyl-propionic acid (318 mg; 1J2 mmol) in acetonitrile was heated to reflux for 18h. The mixture was then allowed to cool to room temperature and the mixture stored in the refrigerator for 3h. The solid was filtered off, rinsed with cold acetonitrile and air dried to give 424 mg (82%) of 3-Cycloheptyl-2-(l-oxo-l,3-dihydro-isoindol-2-yl)- propionic acid as a beige solid: EI-HRMS m/e calcd for C18H23NO3 (M+) 301.1678, found 301.1668.
Ste F: 3-Cycloheptyl-2-(l-oxo-l,3-dihydro-isoindol-2-yl)-N-thiazol-2-yl- propionamide BOP coupling of 3-Cycloheptyl-2-(l-oxo-l,3-dihydro-isoindol-2-yl)-propionic acid (prepared in Step E; 173 mg; 0.58 mmol) and 2-aminothiazole (97 mg; 0.94 mmol) in a manner similar to that used for the preparation of (S)-3-cyclohexyl-2-(l- oxo-l,3-dihydro-isoindol-2-yl)-N-thiazol-2-yl-propionamide as outlined in Example 1, Step B) provided after flash chromatography (Biotage 40S, eluent: 35% ethyl acetate / hexanes) 217 mg (99%) of 3-Cycloheptyl-2-(l-oxo-l,3-dihydro-isoindol-2-yl)-N- fhiazol-2-yl-propionamide as a white foam EI-HRMS m/e calcd for C2ιH25N3O2S (M+) 383.1667, found 383.1660. Example 20
N-(5-CWoro-tWazol-2-yl)-3-cycloheptyl-2-(l-oxo-l,3-dihydro-isoindol-2-yl)- propionamide
Figure imgf000040_0001
BOP coupling of 3-Cycloheptyl-2-(l-oxo-l,3-dihydro-isoindol-2-yl)-propionic acid (prepared in Step E; 177 mg; 0.59 mmol) and 2-amino-5-chlorofhiazole hydrochloride (168 mg; 0.95 mmol) in a manner similar to that used for the preparation of (S)-3-cyclohexyl-2-(l-oxo-l,3-dihydro-isoindol-2-yl)-N-thiazol-2-yl- propionamide as outlined in Example 1, Step B) provided after flash chromatography (Biotage 40M, eluent: 20% ethyl acetate / hexanes) 99 mg (40%) of N-(5-Chloro- thiazol-2-yl)-3-cycloheptyl-2-( 1-oxo- l,3-dihydro-isoindol-2-yl)-propionamide as an off white foam EI-HRMS m/e calcd for C21H24ClN3O2S (M+) 417.1278, found 417.1289.
Example 21
3-Cyclooctyl-2- (1-oxo- 1 ,3-dmydro-isoindol-2-yl)-N-thiazol-2-yl-propionamide
Figure imgf000040_0002
Step A: cyclooctylmethyl iodide
To a stirred solution of cyclooctyymethanol (5.00g; 35.2 mmol) and Iodine (8.93g; 35.2 mmol) in dry methylene chloride (100 mL) at room temperature was added triphenylphosphine (9.23g; 35.2 mmol) portionwise over a 10 minute period. After lh, the mixture was diluted with methylene chloride, washed with water followed by saturated sodium bisulfite solution and the organic layer dried (magnesium sulfate), filtered and concentrated in vacuo. The crude product was chromatographed (eluent:hexanes) to give 5.35g (60%) of cyclooctylmethyl iodide as an oil.
Step B: 2-(Benzhydrylidene-amino)-3-cyclooctyl-propionic acid tert-butyl ester
To a stirred solution of (Benzhydιylidene-amino)-acetic acid tert-butyl ester (3.00g; 10.1 mmol) in 60 mL of tetrahydrofuran under argon at -78°C was added lithium diisopropylamide solution (11.5 mL; 1.5 M solution in cyclohexane) dropwise. After 30 minutes, a solution of cycloheptylmethyl iodide (Prepared in Step A; 3.83g; 15.2 mmol) was added dropwise via syringe and the mixture allowed to warm to room temperature and stirred for 18 h. The mixture was quenched with saturated sodium bicarbonate solution and most of the tetrahydrofuran was removed in vacuo. The mixture was diluted with water and extracted with methylene chloride. The combined extracts were dried (sodium sulfate) filtered and concentrated in vacuo. The crude product was chromatographed (eluent:4% ethyl acetate/hexanes) to give 3.34g (79%) of 2-(Benzhydrylidene-amino)-3-cyclooctyl-propionic acid tert-butyl ester as a pale yellow oil. Step C: 2-Amino-3-cyclooctyl-propionic acid
To a solution of 2-(Benzhydrylidene-ammo)-3-cyclooctyl-propionic acid tert- butyl ester (2.00g) in methanol (15 mL) was added ION HC1 solution (30 mL) and the mixture heated to reflux. After 20h, the mixture was allowed to cool to room temperature, diluted with 20 mL of water, transferred to a separatory funnel and washed with ethyl acetate. The aqueous layer was then neutralized with ION sodium hydroxide solution and further cooled to 0°C. The white solid was filtered off and air dried to give 590 mg of 2-Amino-3-cyclooctyl-propionic acid.
Step D: 3-Cyclooctyl-2-(l-oxo-l,3-dihydro-isoindol-2-yl)-propionic acid
A solution of phthalic dicarboxaldehyde (349 mg; 2.60 mmol) and 2-Amino-3- cyclooctyl-propionic acid (500 mg; 2.51 mmol) in acetonitrile (20 mL) was heated to reflux for 3h. The mixture was then hot filtered to remove insoluble material and then allowed to cool to room temperature and then further cooled to 0°C. The solid was filtered off, rinsed with cold acetonitrile and air dried to give 480 mg (62%) of 3- Cyclooctyl-2-( 1-oxo- l,3-dihydro-isoindol-2-yl)-propionic acid as a white solid: EI- HRMS m/e calcd for Cι9H25NO3 (M+) 315.1834, found 315.1840.
Step E: 3-Cyclooctyl-2-(l-oxo-l,3-dihydro-isoindol-2-yl)-N-thiazol-2-yl- propionamide BOP coupling of 3-Cyclooctyl-2-(l-oxo-l,3-dihydro-isoindol-2-yl)-propionic acid (prepared in Step D; 200 mg; 0.65 mmol) and 2-aminothiazole (70 mg; 0J0 mmol) in a manner similar to that used for the preparation of (S)-3-cyclohexyl-2-(l- oxo-l,3-dihydro-isoindol-2-yl)-N-thiazol-2-yl-propionamide as outlined in Example 9, Step B) provided after flash chromatography (eluent: 30% ethyl acetate / hexanes) 226 mg (88%) of 3-Cyclooctyl-2-(l-oxo-l,3-dihydro-isoindol-2-yl)-N-thiazol-2-yl- propionamide as a white foam: EI-HRMS m/e calcd for C22H27N3O2S (M+) 397.1824, found 397.1825.
Example 22
(R)-N- (5-Bromo-pyridin-2-yl)-3-cyclohexyl-2- (1-oxo- 1 ,3-dihydro-isoindol-2-yl)- propionamide
Figure imgf000042_0001
BOP coupling of (S)-3-Cyclohexyl-2-(l-oxo-l,3-dihydro-isoindol-2-yl)-propionic acid (prepared in Example 1, Step A; 287 mg; 1.00 mmol) and 2-amino-5- bromopyridine ( 173 mg; 1.00 mmol) in a manner similar to that used for the preparation of (R)-3-cyclohexyl-2-(l-oxo-l,3-dihydro-isoindol-2-yl)-N-thiazol-2-yl- propionamide (outlined in Example 9, Step B) provided after flash chromatography (Merck Silica gel 60, 230-400 mesh, eluent: 30% ethyl acetate / hexanes) 243 mg (55%)of (S)-N-(5-Bromo-pyridin-2-yl)-3-cyclohexyl-2-(l-oxo-l,3-dihydro-isoindol-2-yl)- propionamide as a white foam : EI-HRMS m/e calcd for C22H2 BrN3O2 (M+) 441.1052, found 441.1036. Example 23
23.L (S)-3-Cyclohexyl-2-(4-fluoro-l-oxo-l,3-dihydro-isoindol-2-yl)-N-thiazol-2-yl- propionamide and 23.2. (S)-3-Cyclohexyl-2-(7-fluoro-l-oxo-l,3-dihydro-isoindol-2- yl)-N-thiazol-2-yl-propionamide
Figure imgf000043_0001
BOP coupling of (S)-3-cyclohexyl-2- (4-fluoro- 1-oxo- l,3-dihydro-isoindol-2-yl)- propionic and (S)-3-cyclohexyl-2-(7-fluoro-l-oxo-l,3-dihydro-isoindol-2-yl)- propionic acid (499 mg; 1.63 mmol, as a 1:1 mixture of regioisomers) and 2- aminothiazole (376 mg; 3.64 mmol) in a manner similar to that used for the preparation of (S)-3-cyclohexyl-2-(l-oxo-l,3-dihydro-isoindol-2-yl)-N-thiazol-2-yl-propionamide (outlined in Example 9, Step B) provided after flash chromatography (Biotage 40M; eluent: 30% ethyl acetate / hexanes) (S)-3-Cyclohexyl-2-(4-fluoro-l-oxo-l,3-dihydro- isoindol-2-yl)-N-fhiazol-2-yl-propionamide (221 mg): EI-HRMS m/e calcd for C20H22FN3O2S (M+) 387.1417, found 387.1422; and impure (S)-3-Cyclohexyl-2-(7- fluoro-l-oxo-l,3dihydro-isoindol-2-yl)-N-thiazol-2-yl-propionamide which was further purified by radial chromatography (eluent:35% ethyl acetate / hexanes) providing 48 mg of pure (S)-3-Cyclohexyl-2-(7-fluoro-l-oxo-l,3dihydro-isoindol-2- yl)-N-thiazol-2-yl-propionamideas a white foam: EI-HRMS m/e calcd for C20H22FN3O2S (M+) 387.1417, found 387.1415. Example 24
(S)-3-Cyclohexyl-N-(lH-imidazol-2-yl)-2-(l-oxo-l,3-dihydro-isoindol-2-yl) propionamide
Figure imgf000044_0001
BOP coupling of (S)-3-Cyclohexyl-2-(l-oxo-l,3-dihydro-isoindol-2-yl)-propionic acid (prepared in Example 1, Step A; 287 mg; 1.00 mmol) and 2-aminoimidazole (241 mg; 1.79 mmol) in a manner similar to that used for the preparation of (S)-3- cyclohexyl-2-( 1-oxo- l,3-dihydro-isoindol-2-yl)-N-thiazol-2-yl-propionamide (outlined in Example 1, Step B) provided after flash chromatography (Biotage 40M; eluent: 4% methanol / methylene chloride) 320 mg of (S)-3-Cyclohexyl-N-( lH-imidazol-2-yl)-2- (l-oxo-l,3-dihydro-isoindol-2-yl) propionamide which was then recrystallized from ethyl acetate/ hexanes to give 209 mg of pure material: EI-HRMS m/e calcd for C20H24N4O2 (M+) 352.1899, found 352.1895.
Example 25
"25.1. (S)-3-Cyclohexyl-2- (4-fluoro- 1-oxo- l,3dihydro-isoindol-2-yl)-N- pyrazin-2-yl- propionamide and 25.2. (S)-3-cyclohexyl-2-(7-fluoro-l-oxo-l,3-dihydro-isoindol-2- yl)-N-pyrazin-2-yl-propionamide
Figure imgf000044_0002
BOP coupling of (S)-3-cyclohexyl-2-(4-fluoro-l-oxo-l,3-dihydro-isoindol-2-yl)- propionic and (S)-3-cyclohexyl-2-(7-fluoro-l-oxo-l,3-dihydro-isoindol-2-yl)- propionic acid (331 mg; 1.08 mmol, as a 1:1 mixture of regioisomers) and 2- aminopyrazine (232 mg; 2.41 mmol) in a manner similar to that used for the preparation of (S)-3-cyclohexyl-2-( l-oxo-l,3-dihydro-isoindol-2-yl)-N-thiazol-2-yl- propionamide (outlined in Example 9, Step B) provided after flash chromatography (Biotage 40M; eluent: 30% ethyl acetate / hexanes) (S)-3-Cyclohexyl-2-(4-fluoro-l-oxo- l,3-dihydro-isoindol-2-yl)-N-thiazol-2-yl-propionamide and (S)-3-Cyclohexyl-2-(7- fluoro- 1 -oxo- 1 ,3dihydro-isoindol-2-yl) -N-thiazol-2-yI-propionamide which were further purified by reverse phase HPLC (Rainin Dynamax SD-1 instrument) using a gradient of 40% acetonitrile/water/0.1% trifluoroacetic acid to 100% acetonitrile on a C18 column to provide 39 mg of pure (S)-3-Cyclohexyl-2-(7-fluoro-l-oxo-l,3dihydro- isoindol-2-yl)-N-thiazol-2-yl-propionamide as a white foam: EI-HRMS m/e calcd for C21H23FN4O2 (M+) 382.1805, found 382.1794 and 43 mg of regioisomer (S)-3- Cyclohexyl-2-(7-fluoro-l-oxo-l,3dihydro-isomdol-2-yl)-N-thiazol-2-yl-propionamide: EI-HRMS m/e calcd for C2ιH23FN4O2 (M+) 382.1805, found 382.1810.
Example 26
(S)-3-Cyclohexyl-2-(l-oxo-l,3-dihydro-isoindol-2-yl)-N-pyridin-2-yl-propionamide
Figure imgf000045_0001
BOP coupling of (S)-3-Cyclohexyl-2-(l-oxo-l,3-dihydro-isoindol-2-yl)-propionic acid (prepared in Example 1, Step A; 287 mg; 1.00 mmol) and 2-aminopyridine (94 mg; 1.00 mmol) in a manner similar to that used for the preparation of (R)-3-cyclohexyl-2- (l-oxo-l,3-dihydro-isoindol-2-yl)-N-thiazol-2-yl-propionamide (outlined in Example 9, Step B) provided after flash chromatography (Merck Silica gel 60, 230-400 mesh, eluent: 45% ethyl acetate / hexanes) 186 mg of (S)- 3-Cyclohexyl-2-( 1-oxo- 1,3-dihydro- isoindol-2-yl)-N-pyridin-2-yl-propionamide as a white foam: EI-HRMS m/e calcd for C22H25N3O2 (M+) 363.1947, found 363.1935. Example 27 (S)-N-3-Cyclohexyl-N-(2-methyl-pyrimidin-4-yl)-2-(l-oxo-l,3-dihydro-isoindol-2- yl)-propionamide
Figure imgf000046_0001
BOP coupling of (S)-3-CyclohexyI-2-(l-oxo-l,3-dihydro-isoindol-2-yl)-propionic acid (prepared in Example 1, Step A; 150 mg; 0.52 mmol) and 2-amino-6- methylpyrimidine (57 mg; 0.52 mmol) in a manner similar to that used for the preparation of (R)-3-cyclohexyl-2-( 1-oxo- l,3-dihydro-isoindol-2-yl)-N-fhiazol-2-yl- propionamide (outlined in Example 9, Step B) provided after flash chromatography (Merck Silica gel 60, 230-400 mesh, eluent: 65% ethyl acetate / hexanes) 109 mg of (S)- 3-Cyclohexyl-N-(2-methyl-pyrimidin-4-yl)-2-(l-oxo-l,3-dihydro-isoindol-2-yl)- propionamide as a white foam: EI-HRMS m/e calcd for C22H26N O2 (M+) 378.2056, found 378.2054.
Example 28
28.1 (S)-3-Cyclohexyl-2-(4-methylsulfonyl-l-oxo-l,3-dihydro-isoindol-2-yl)-N- thiazol-2-yl-propionamide and 28.2. (S)-3-cyclohexyl-2-(7-methylsulfonyl-l-oxo-l,3- dihydro-isoindol-2-yl)-N-thiazol-2-yl-propionamide
Figure imgf000046_0002
Step A: 3-fluorophthalic acid, dimethyl ester
Hydrochloric acid was bubbled into a stirred solution of 3-fluorophthalic acid (2.00 g; 10.9 mmol) in dry methanol at room temperature for 2 minutes. The mixture was warmed to reflux. After lh at at reflux, lmL of concentrated sulfuric acid was added and reflux continued for 22h. The mixture was allowed to cool to room temperature and then neutralized with saturated sodium bicarbonate solution. The resulting mixture was extracted with ethyl acetate. The extracts were dried (sodium sulfate), filtered and concentrated in vacuo to give lJOg of 3-fluorophthalic acid, dimethyl ester as an oil.
Step B: 3-thiomethylphthalic acid
A mixture of 3-fluorophthalic acid, dimethyl ester (2.27g; 10J mmol) and sodium thiomethoxide (6.34g; 85.9 mmol) in DMSO (20 mL) was heated to 50oC. After 24h, crushed ice was added and the resulting mixture acidified with IN HCL. The solution was extracted with ethyl acetate and the extracts were washed with brine, dried (sodium sulfate), filtered and concentrated in vacuo. The crude product was purified by reverse phase HPLC (Rainin Dynamax SD-1 instrument) using a gradient of 0% acetonitrile/water/0.1% trifluoroacetic acid to 100% acetonitrile on a C18 column to provide 802 mg of 3-thiomethylphthalic acid.
Step C: 3-thiomethyl- 1 ,2 -di- (hydroxymethyl) benzene
To a stirred solution of borane.tetrahydrofuran complex (14.0 mL of 1.5 M solution in tetrahydrofuran/diefhyl ether) cooled to 0°C under argon was added a solution of 3-thiomethylphthalic acid (0J39g; 3.48 mmol) in 20 mL tetrahydrofuran. At the end of the addition, the mixture was refluxed for 15h. The mixture was allowed to cool to room temperature, quenched with methanol (20mL), refluxed for 2h and concentrated in vacuo. The residue was partitioned between IN HCL and ethyl acetate. The aqueous layer was further extracted with ethyl acetate and the combined extracts were washed saturated sodium bicarbonate, brine and dried (sodium sulfate), filtered and concentrated in vacuo to give crude 3-thiomethyl- 1,2 -di- (hydroxymethyl) benzene which was purified flash chromatography (Biotage 40M; eluent: 25% - 50% gradient of ethyl acetate/hexanes) to give 454 mg of pure 3-thiomethyl- 1,2 -di- (hydroxymethyl) benzene. Step D: 3-thiomethylphthalic dicarboxaldehyde
To a stirred solution of oxalyl chloride (0.42 mL; 4J2 mmol) in anhydrous methylene chloride (5 mL) under argon at -78°C was added a solution of dimethyl sulfoxide (0.70 mL; 9.67 mmol) in methylene chloride (2 mL) dropwise. The solution was stirred for 10 minutes and then a solution of 3-thiomethyl- 1,2 -di-(hydroxymethyl) benzene (0.415g; 2.25 mmol) dissolved in 3 mL of 1:1 methylene chloride/dimethyl sulfoxide was added dropwise. The resulting mixture was stirred at -78°C for 2 h . Triethylamine (5.5 mL; 17.4 mmol) was added dropwise and then the mixture allowed to gradually warm to room temperature and stirred for 20h. The mixture was poured into ice water the layers were separated. The extract was washed with brine and then dried (sodium sulfate) and concentrated to give crude 3-thiomethylphthalic dicarboxaldehyde which was not further purified.
Step E: (S)-3-cyclohexyl-2-(4-methylthio-l-oxo-l,3-dihydro-isoindol-2-yl)- propionic acid
A mixture of (S)-(+)-α-aminocyclohexanepropionic acid hydrate (0.125 g; 0.70 mmol) and crude 3-thiomethylphthalic dicarboxaldehyde (prepared in StepD; 0.250g; 1.4 mmol) in acetonitrile (5 mL) was heated to reflux under argon for 18h. The mixture was allowed to cool to room temperature and concentrated in vacuo. The crude product was purified by flash chromatography (Biotage 40S; eluent: 5% methanol/methylene chloride) to give 260 mg of (S)-3-cyclohexyl-2-(4-methylthio-l-oxo-l,3-dihydro- isoindol-2-yl)-propionic acid together with regio-isomeric (S)-3-cyclohexyl-2-(7- methylthio-l-oxo-l,3-dihydro-isoindol-2-yl)-propionic acid in a ratio of about 1:1.
Step F: (S)-3-cyclohexyl-2-(4-methylsulfonyl-l-oxo-l,3-dihydro-isoindol-2-yl)- propionic acid
To a solution of (S)-3-cyclohexyl-2-(4-methylthio-l-oxo-l,3-dihydro-isoindol-2- yl)-propionic acid and regio-isomeric (S)-3-cyclohexyl-2-(7-methylthio-l-oxo-l,3- dihydro-isoindol-2-yl)-propionic acid (0J90g; 2.37 mmol; ca.l:l mixture) in formic acid (4mL) at 0°C was added 30% hydrogen peroxide solution (1.3 mL; 12.7 mmol) dropwise. The mixture was allowed to warm to room temperature and stirred for 19h. The mixture was concentrated under a stream of nitrogen to remove the formic acid to give 0.901g of crude (S)-3-cyclohexyl-2-(4-methylsulfonyl-l-oxo-l,3-dihydro-isoindol- 2-yl)-propionic acid and regio-isomeric (S)-3-cyclohexyl-2-(7-methylsulfonyl-l-oxo- l,3-dihydro-isoindol-2-yl)-propionic acid.
Step G: (S)-3-Cyclohexyl-2-(7-methylsuIfonyl-l-oxo-l,3dihydro-isoindoI-2-yl)-N- thiazol-2-yl-propionamide
BOP coupling of (S)-3-cyclohexyl-2-(4-methylsulfonyl-l-oxo-l,3-dihydro- isoindol-2-yl)-propionic acid and regio-isomeric (S)-3-cyclohexyl-2-(7- methylsulfonyl-l-oxo-l,3-dihydro-isoindol-2-yl)-propionic acid (112 mg; 0.31 mmol) and 2-aminothiazole (54 mg; 0.52 mmol) in a manner similar to that used for the preparation of (S)-3-cyclohexyl-2-(l-oxo-l,3-dihydro-isoindol-2-yl)-N-thiazol-2-yl- propionamide (outlined in Example 9, Step B) provided after flash chromatography (Biotage 40M; eluent: ethyl acetate / methylene chloride: gradient 15% - 50% ethyl acetate) provided 51 mg (S)-3-Cyclohexyl-2-(4-methylsulfonyl-l-oxo-l,3dihydro- isoindol-2-yl)-N-thiazol-2-yl-ρroρionamide: EI-HRMS m/e calcd for C^H^NjO^ (Mt 2) 445.1130, found 445.1125 and 39 mg of (S)-3-Cyclohexyl-2-(7-methylsulfonyl-l- oxo-l,3dihydro-isoindol-2-yl)-N-thiazol-2-yl-propionamide: EI-HRMS m/e calcd for C21H25N3O4S2 (MT) 447.1286, found 447.1280.
Example 29 29.1. (S)-3-Cyclohexyl-2-(4-methylsulfonyl-l-oxo-l,3-dihydro-isoindol-2-yl)-N- pyrazin-2-yl-propionamide and 29.2. (S)-3-cyclohexyl-2-(7-methylsulfonyl-l-oxo- l,3-dihydro-isoindol-2-yl)-N-pyrazin-2-yl-propionamide
Figure imgf000049_0001
BOP coupling of (S)-3-cyclohexyl-2-(4-methylsulfonyl-l-oxo-l,3-dihydro- isoindol-2-yl)-propionic acid and regio-isomeric (S)-3-cyclohexyl-2-(7- methylsulfonyl-l-oxo-l,3-dihydro-isoindol-2-yl)-propionic acid (200 mg; 0.55 mmol) and 2-aminopyrazine (88 mg; 0.91 mmol) in a manner similar to that used for the preparation of (S)-3-cyclohexyl-2-(l-oxo-l,3-dihydro-isoindol-2-yl)-N-thiazol-2-yl- propionamide (outlined in Example 9, Step B) provided after flash chromatography (Biotage 40S; eluent: ethyl acetate / methylene chloride, gradient:20% to 60%) a crude mixture that was further purified by reverse phase HPLC (Rainin Dynamax SD-1 instrument) using a gradient of 10% acetonitrile/water/0.1% trifluoroacetic acid to 90% acetonitrile on a C18 column to give 21 mg of (S)-3-Cyclohexyl-2-(4-methylsulfonyl-l- oxo-l,3-dihydro-isoindol-2-yl)-N-pyrazin-2-yl-propionamide: EI-HRMS m/e calcd for C^N .SNa (M*+ Na+) 465.1567, found 465.1570 and 13 mg of (S)-3-Cyclohexyl-2- (7-methylsulfonyl-l-oxo-l,3-dihydro-isoindol-2-yl)-N-pyrazin-2-yl-propionamide: EI- HRMS m/e calcd for C^N .SNa (M"+ Na+) 465.1567, found 465.1568.
Example 30 30.1. (S)-3-Cyclohexyl-2-(4-methyIsulfonyl-l-oxo-l,3-dihydro-isoindol-2-yl)-N- pyrimidin-4-yl-propionamide and 30.2. (S)- 3-Cyclohexyl-2-(7-methylsulfonyl-l- oxo-l,3-dihydro-isoindol-2-yl)-N-pyrimidin-4-yl-propionamide
Figure imgf000050_0001
BOP coupling of (S)-3-cyclohexyl-2-(4-methylsulfonyl-l-oxo-l,3-dihydro- isoindol-2-yl)-propionic acid and regio-isomeric (S)-3-cyclohexyl-2-(7- methylsulfonyl-l-oxo-l,3-dihydro-isoindol-2-yl)-propionic acid (200 mg; 0.55 mmol) and 4-aminopyrimidine (89 mg; 0.91 mmol) in a manner similar to that used for the preparation of (S)-3-cyclohexyl-2-(l-oxo-l,3-dihydro-isoindol-2-yl)-N-thiazol-2-yl- propionamide (outlined in Example 9, Step B) provided after flash chromatography (Biotage 40S; eluent: ethyl acetate / methylene chloride, gradient: 25% to 70% ethyl acetate) to give 83 mg of (S)- 3-Cyclohexyl-2-(4-methylsulfonyl-l-oxo-l,3-dihydro- isoindol-2-yl)-N-pyrimidin-4-yl-propionamide as a foam: EI-HRMS m/e calcd for C22H24N404SNa (M+ Na+) 465.1567, found 465.1568 and 77 mg (S)- 3-Cyclohexyl-2- (7-methylsulfonyl- 1 -oxo- 1 ,3-dihydro-isoindol-2-yl)-N-pyrimidin-4-yl-propionamide as a foam: EI-HRMS m/e calcd for C^N^SNa (M*+ Na+) 465.1567, found 465.1572.
Example 31 (S)-3-Cyclohexyl-2-(l-oxo-l,3-dihydro-isoindol-2-yl)-N-5-methyl-pyridin-2-yl- propionamide
Figure imgf000051_0001
BOP coupling of (S)-3-Cyclohexyl-2-(l-oxo-l,3-dihydro-isoindol-2-yl)-propionic acid (prepared in Example 1, Step A; 287 mg; 1.00 mmol) and 2-amino-5- methylpyridine (143 mg; 1.32 mmol) in a manner similar to that used for the preparation of (S)-3-cyclohexyl-2-(l-oxo-l,3-dihydro-isoindol-2-yl)-N-thiazol-2-yl- propionamide (outlined in Example 1, Step B) provided after flash chromatography (Biotage 40S; eluent: 30% ethyl acetate / hexanes) 352 mg of (S)- 3-Cyclohexyl-2-(l- oxo-l,3-dihydro-isoindol-2-yl)-N-5-methyl-pyridin-2-yl-propionamide as a white foam: EI-HRMS m/e calcd for C23H27N3O2 (M+) 377.2103, found 377.2107.
Example 32 (S)-3-Cyclohexyl-2-(l-oxo-l,3-dihydro-isoindol-2-yl)-N-4-methyl-pyridin-2-yl- propionamide
Figure imgf000052_0001
BOP coupling of (S)-3-Cyclohexyl-2-(l-oxo-l,3-dihydro-isoindol-2-yl)-propionic acid (prepared in Example 1, Step A; 287 mg; 1.00 mmol) and 2-amino-4- methylpyridine (143 mg; 1.32 mmol) in a manner similar to that used for the preparation of (S)-3-cyclohexyl-2-(l-oxo-l,3-dihydro-isoindol-2-yl)-N-thiazol-2-yl- propionamide (outlined in Example 1, Step B) provided after flash chromatography (Biotage 40S; eluent: 30% ethyl acetate / hexanes) 344 mg of (S)- 3-Cyclohexyl-2-(l- oxo-l,3-dihydro-isoindol-2-yl)-N-4-methyl-pyridin-2-yl-propionamide as a white foam: EI-HRMS m/e calcd for C23H27N3O2 (M+) 377.2103, found 377.2106.
Example 33 (S)-3-Cyclohexyl-2-(l-oxo-l,3-dihydro-isoindol-2-yl)-N-5-chloro-pyridin-2-yl- propionamide
Figure imgf000052_0002
BOP coupling of (S)-3-Cyclohexyl-2-( 1-oxo- l,3-dihydro-isoindol-2-yl)-propionic acid (prepared in Example 1, Step A; 287 mg; 1.00 mmol) and 2-amino-5- chloropyridine (129 mg; 1.00 mmol) in a manner similar to that used for the preparation of (S)-3-cyclohexyl-2-(l-oxo-l,3-dihydro-isoindol-2-yl)-N-thiazol-2-yl- propionamide (outlined in Example 1, Step B) provided after flash chromatography (eluent: 25% ethyl acetate / hexanes) 160 mg of (S)- 3-Cyclohexyl-2-(l-oxo-l,3- dihydro-isoindol-2-yl)-N-5-chloro-pyridin-2-yl-propionamide as a white foam: EI- HRMS m/e calcd for C22H24N3O2ClNa(M++Na+) 420.1449, found 420.1451.
Example 34 (S)-3-Cyclohexyl-2-(l-oxo-l,3-dihydro-isoindol-2-yl)-N-(l-oxy-pyridin-2-yl)- propionamide
Figure imgf000053_0001
BOP coupling of (S)-3-Cyclohexyl-2-(l-oxo-l,3-dihydro-isoindol-2-yl)-propionic acid (prepared in Example 1, Step A; 287 mg; 1.00 mmol) and 2-aminopyridine N- Oxide ( 110 mg; 1.00 mmol) in a manner similar to that used for the preparation of (R)- 3-cyclohexyl-2-(l-oxo-l,3-dihydro-isoindol-2-yl)-N-thiazol-2-yl-propionamide (outlined in Example 9, Step B) provided after flash chromatography (Merck Silica gel 60, 230-400 mesh, eluent: 2% methanol / ethyl acetate) 340 mg (55%)of (S)-N-(pyridin- N-oxide-2-yl)-3-cyclohexyl-2-(l-oxo-l,3-dihydro-isoindol-2-yl)-propionamide as an off white foam. The product did not appear to be pure by NMR and so it was further purified by reverse phase HPLC (Rainin Dynamax SD-1 instrument) using a gradient of 10% acetonitrile/water/0.1% trifluoroacetic acid to 100% acetonitrile on a C18 column to provide 188 mg of pure (S-3-Cyclohexyl-2-(l-oxo-l,3-dihydro-isoindol-2-yι)-N-(l- oxy-pyridin-2-yl) -propionamide: ES-LRMS m/e calcd for C22H25N3O3 (M++H+) 380, found 380. Example 35 35.1. (S)-3-Cyclohexyl-2-(4-fluoro-l-oxo-l,3-dihydro-isoindol-2-yl)-N-pyridin-2-yI- propionamide and 35.2. (S)-3-Cyclohexyl-2-(7-fluoro-l-oxo-l,3-dihydro-isoindol-2- yl)-N-pyridin-2-yl-propionamide
Figure imgf000054_0001
BOP coupling of (S)-3-cyclohexyl-2-(4-fluoro- 1-oxo- l,3-dihydro-isoindol-2-yl)- propionic acid (ca. 1:1 mixture of regioisomers, prepared in Example 13, Step C; 501 mg; 1.64 mmol) and 2-aminopyridine (643 mg; 3.64 mmol) in a manner similar to that used for the preparation of (S)-3-cyclohexyl-2-(l-oxo-l,3-dihydro-isoindol-2-yl)-N- thiazol-2-yl-propionamide as outlined in Example 9, Step B) provided after reverse phase HPLC (Rainin Dynamax SD-1 instrument) using a gradient of 40% acetonitrile/water/0.1% trifluoroacetic acid to 70% acetonitrile on a C18 column to give 157 mg of (S)-3-Cyclohexyl-2-(4-fluoro-l -oxo-1, 3-dihydro-isoindol-2-yl)-N-pyridin-2- yl-propionamide: EI-HRMS m/e calcd for C22H24FN3O2Na (TVT+Na+) 404.1745, found 404.1748; and 99 mg of regioisomeric (S)-3-Cyclohexyl-2-(7-fluoro-l-oxo-l,3-dihydro- isoindol-2-yl)-N-pyridin-2-yl-propionamide: EI-HRMS m/e calcd for C22H24FN3O2Na (M++Na+) 404.1745, found 404.1749.
Example 36
36.1. (S)-3-Cyclohexyl-2-(4-Chloro-l-oxo-l,3-dihydro-isoindol-2-yl)-N-thiazol-2-yl- propionamide and 36.2. (S)-3-Cyclohexyl-2-(7-Chloro-l-oxo-l,3dihydro-isoindol-2- yl)-N-thiazol-2-yI-propionamide
Figure imgf000054_0002
StepA: 3-chloro-l,2 -di-(hydroxymethyl) benzene
3-chloro-l,2 -di- (hydroxymethyl) benzene was prepared in 97% yield via borane reduction of 3-Chlorophthalic acid in a manner similar to that was used for the preparation of 3-fluoro-l,2 -di- (hydroxymethyl) benzene as described in Example 13, Step A. 3-Chlorophthalic acid was prepared from according to the literature procedure of Fertel, L.B. et al. /. Org. Chem. 1993, 58(1), 261-263.
Step B: 3-chlorophthalic dicarboxaldehyde 3-chlorophthalic dicarboxaldehyde was prepared via oxidation of 3-chloro-l,2 - di-(hydroxymethyl) benzene (prepared in Step A) in a manner similar to that used for the preparation of 3-fluorophthalic dicarboxaldehyde as described in Example 13, Step B and the crude product was used without further purification for the next step.
Step C:(S)-3-cyclohexyl-2-(4-Chloro-l-oxo-l,3-dihydro-isoindol-2-yl)-propionic acid and :(S)-3-cyclohexyl-2-(7-Chloro-l-oxo-l,3-dihydro-isoindol-2-yl)-propionic acid
(S)-3-cyclohexyl-2-(4-Chloro-l-oxo-l,3-dihydro-isoindol-2-yl)-propionic acid and (S)-3-cyclohexyl-2-(7-Chloro-l-oxo-l,3-dihydro-isoindol-2-yl)-propionic acid (approx. 1 : 1 mixture) were prepared by condensation of (S)-(+)-α- aminocyclohexanepropionic acid hydrate with 3-chlorophthalic dicarboxaldehyde (prepared in Step B) in a manner similar to that used for the preparation of (S)-3- cyclohexyl-2-(4-Fluoro-l-oxo-l,3-dihydro-isoindol-2-yl)-propionic acid and (S)-3- cyclohexyl-2-(7-Fluoro-l-oxo-l,3-dihydro-isoindol-2-yl)-propionic acid as described in Example 13, Step C.
Step D: (S)-3-Cyclohexyl-2-(4-Chloro-l-oxo-l,3-d ydro-isomdol-2-yl)-N-thiazol-2-yl- propionamide and (S)-3-Cyclohexyl-2-(7-Chloro-l-oxo-l,3dihydro-isoindol-2-yl)-N- thiazol-2-yl-propionarnide
BOP coupling of (S)-3-cyclohexyl-2-(4-Chloro-l-oxo-l,3-dihydro-isoindol-2-yl)- propionic acid (ca. 1:1 mixture of regioisomers, prepared in Step C; 326 mg; 1.0 mmol) and 2-aminothiazole (231 mg; 2.23 mmol) in a manner similar to that used for the preparation of (S)-3-cyclohexyl-2-(l-oxo-l,3-dihydro-isoindol-2-yl)-N-thiazol-2-yl- propionamide as outlined in Example 9, Step B) provided after chromatography (Biotage 40M column, eluent: 5% to 30% gradient of ethyl acetate / hexanes) 132 mg of (S)-3-Cyclohexyl-2-(4-Chloro-l-oxo-l,3-dihydro-isoindol-2-yl)-N-thiazol-2-yl- propionamide: EI-HRMS m/e calcd for C20H22C1N3O2S (M++Na+) 426.1013, found 426.1016; and 91 mg of regioisomeric (S)-3-Cyclohexyl-2-(7-Chloro- 1-oxo- l,3dihydro- isoindol-2-yl)-N-thiazol-2-yl-propionamide: EI-HRMS m/e calcd for C20H22ClN3O2SNa (M++Na+) 426.1013, found 426.1017.
Example 37
37.1. (S)-N-(5-Chloro-thiazoI-2-yl)-3-cyclohexyl-2-(4-Chloro-l-oxo-l,3-dihydro- isoindol-2-yl)-propionamide and 37.2. (S)-N-(5-Chloro-thiazol-2-yl)-3-cyclohexyl-2- (7-Chloro-l-oxo-l,3-dihydro-isoindol-2-yl)-propionamide
Figure imgf000056_0001
BOP coupling of (S)-3-cyclohexyl-2-(4-Chloro-l-oxo-l,3-dihydro-isoindol-2-yl)- propionic acid (ca. 1:1 mixture of regioisomers, prepared in Example 36, Step C; 151 mg; 0.47 mmol) and 2-amino-5-chlorothiazole hydrochloride(186 mg; 1.05 mmol) in a manner similar to that used for the preparation of (S)-3-cyclohexyl-2-(l-oxo-l,3- dihydro-isoindol-2-yl)-N-thiazol-2-yl-propionamide as outlined in Example 9, Step B) provided after chromatography (Biotage 40M column, eluent: 5% to 20% gradient of ethyl acetate / hexanes) 67 mg of (S)-N-(5-Chloro-thiazol-2-yl)-3-cyclohexyl-2-(4- Chloro-l-oxo-l,3-dihydro-isoindol-2-yl)-propionamide: EI-HRMS m/e calcd for C20H2ιCl2N3O2S (M+) 437.0731, found 437.0727; and 46 mg of regioisomeric S)-N-(5- Chloro-thiazol-2-yl)-3-cyclohexyl-2-(7-Chloro-l-oxo-l,3-dihydro-isoindol-2-yl)- propionamide: EI-HRMS m/e calcd for C20H2ιCl2N3O2S (M*+Na+) 437.0731, found 437.0726. Example 38 38.1. (S)-3-Cyclohexyl-2-(4-Chloro-l-oxo-l,3-dihydro-isoindol-2-yl)-N-pyridin-2- yl-propionamide and 38.2. (S)-3-Cyclohexyl-2-(7-Chloro-l-oxo-l,3dihydro- isoindol-2-yl)-N-pyridin-2-yI-propionamide
Figure imgf000057_0001
BOP coupling of (S)-3-cyclohexyl-2-(4-Chloro-l-oxo-l,3-dihydro-isoindol-2-yl)- propionic acid (ca. 1:1 mixture of regioisomers, prepared in Example 36, Step C; 201 mg; 0.62 mmol) and 2-aminopyridine(132 mg; 1.39 mmol) in a manner similar to that used for the preparation of (S)-3-cyclohexyl-2-(l-oxo-l,3-dihydro-isoindol-2-yl)-N- thiazol-2-yl-propionamide as outlined in Example 9, Step B) provided after chromatography (Biotage 40S column, eluent: 30% ethyl acetate / hexanes) 107 mg of (S)-3-Cyclohexyl-2-(4-Chloro-l-oxo-l,3-dihydro-isoindol-2-yl)-N-pyridin-2-yl- propionamide: EI-HRMS m/e calcd for C22H24ClN3O2 (MX) 397.1557, found 397.1563; and 46 mg of regioisomeric (S)-3-Cyclohexyl-2-(7-Chloro-l-oxo-l,3dihydro-isoindol- 2-yl)-N-pyridin-2-yl-propionamide: EI-HRMS m/e calcd for C22H24ClN3O2 (TVf) 397.1557, found 397.1551.
Example 39
39.1. (S)-3-Cyclohexyl-2-(4-chloro-l-oxo-l,3-dihydro-isoindol-2-yl)-N-pyrazin-2-yl- propionamide and 39.2. (S)-3-Cyclohexyl-2-(7-chloro-l-oxo-l,3-dihydro-isoindol-2- yl)-N-pyrazin-2-yl-propionamide
Figure imgf000057_0002
BOP coupling of (S)-3-cyclohexyl-2-(4-Chloro-l-oxo-l,3-dihydro-isoindol-2-yl)- propionic acid (ca. 1:1 mixture of regioisomers, prepared in Example 36, Step C; 243 mg; 0.76 mmol) and 2-aminopyrazine(170 mg; 1J7 mmol) in a manner similar to that used for the preparation of (S)-3-cyclohexyl-2-(l-oxo-l,3-dihydro-isoindol-2-yl)-N- thiazol-2-yl-propionarnide as outlined in Example 9, Step B) provided after chromatography (Biotage 40M column, eluent: 20% ethyl acetate / hexanes) 53 mg of (S)-3-Cyclohexyl-2-(4-Chloro-l-oxo-l,3-dihydro-isoindol-2-yl)-N-pyrazin-2-yl- propionamide: EI-HRMS m/e calcd for C2ιH23ClN O2 (M+) 398.1510, found 398.1520; and 41 mg of regioisomeric (S)-3-Cyclohexyl-2-(7-Chloro-l-oxo-l,3dihydro-isoindol- 2-yl)-N-ρyrazin-2-yl-propionamide: EI-HRMS m/e calcd for C21H23ClN O2 (M+) 398.1510, found 398.1507.
Biological Activity Examples
All of the compounds of this invention which include the compounds set forth in the Examples activated glucokinase in vitro by the procedure of Biological Activity
Example A. In this manner, they increase the flux of glucose metabolism which causes increased insulin secretion. Therefore, the compounds of formula I are glucokinase activators useful for increasing insulin secretion.
Biological Activity Example A: In Vitro Glucokinase Activity
Glucokinase Assay: Glucokinase (GK) was assayed by coupling the production of glucose-6-phosphate to the generation of NADH with glucose-6-phosphate dehydrogenase (G6PDH, 0.75-1 kunits/mg; Boehringer Mannheim, Indianapolis, IN) from Leuconostoc mesenteroides as the coupling enzyme (Scheme 2). Recombinant
GK G6PΩH
D-Qucose+ATP *- Gucose-ό-Fhos prAhiaattcc Λ.. >> 6-HιosrfaoglιιconolactθDe
NAD NADH
Scheme 2 Human liver GK1 was expressed in E. coli as a glutathione S-transferase fusion protein (GST-GK) [Liang et al, 1995] and was purified by chromatography over a gluta hione-Sepharose 4B affinity column using the procedure provided by the manufacturer (Amersham Pharmacia Biotech, Piscataway, NJ). Previous studies have demonstrated that the enzymatic properties of native GK and GST-GK are essentially identical (Liang et al, 1995; Neet et al., 1990).
The assay was conducted at 25° C in a flat bottom 96-well tissue culture plate from Costar (Cambridge, MA) with a final incubation volume of 120 μl. The incubation mixture contained: 25 mM Hepes buffer (pH, 7.1), 25 mM KC1, 5 mM D- glucose, ImM ATP, 1.8 mM NAD, 2 mM MgCl2, 1 μM sorbitol-6-phosphate, 1 mM dithiothreitol, test drug or 10% DMSO, 1.8 unit/ml G6PDH, and GK (see below). All organic reagents were >98 % pure and were from Boehringer Mannheim with the exceptions of D-glucose and Hepes that were from Sigma Chemical Co, St Louis, MO. Test compounds were dissolved in DMSO and were added to the incubation mixture minus GST-GK in a volume of 12 μl to yield a final DMSO concentration of 10%. This mix was preincubated in the temperature controlled chamber of a SPECTRAmax 250 microplate spectrophotometer (Molecular Devices Corporation, Sunnyvale, CA) for 10 minutes to allow temperature equilibrium and then the reaction was started by the addition of 20 μl GST-GK.
After addition of enzyme, the increase in optical density (OD) at 340 nm was monitored over a 10 minute incubation period as a measure of GK activity. Sufficient GST-GK was added to produce an increase in OD340 of 0.08 to 0.1 units over the 10 minute incubation period in wells containing 10% DMSO, but no test compound. Preliminary experiments established that the GK reaction was linear over this period of time even in the presence of activators that produced a 5-fold increase in GK activity. The GK activity in control wells was compared with the activity in wells containing test GK activators, and the concentration of activator that produced a 50% increase in the activity of GK, i.e., the SC1.5, was calculated.
All of the compounds of this invention described in the Synthesis Examples had an S .5 less than 30 μM with the exception of Example 9, which had an SC1.5. of 36 μM. These results indicate GK activator activity. References for Biological Activity Example A
Liang, Y., Kesavan, P., Wang, L., Niswender, K., Tanizawa, Y., Permut, M. A., Magnuson, M., and Matschinsky, F. M. Variable effects of maturity-onset-diabetes-of- youth (MODY) -associated glucokinase mutations on the substrate interactions and stability of the enzyme. Biochem. J. 309: 167-173, 1995.
Neet, K., Keenan, R. P., and Tippett, P.S. Observation of a kinetic slow transition in monomeric glucokinase. Biochemistry 29;770-777, 1990.
Biological Activity Example B: In Vivo Activity
Glucokinase Activator in vivo Sσeen Protocol: C57BL/6J mice are orally dosed via gavage with Glucokinase (GK) activator at 50 mg/kg body weight following a two hour fasting period. Blood glucose determinations are made five times during the six hour post-dose study period.
Mice (n=6) are weighed and fasted for a two hour period prior to oral treatment. GK activators are formulated at 6.76 mg/ml in Gelucire vehicle (Ethanol:Gelucire44/14:PEG400q.s. 4:66:30 v/w/v. Mice are dosed orally with 7.5μl formulation per gram of body weight to equal a 50 mg/kg dose. Immediately prior to dosing, a pre dose (time zero) blood glucose reading is acquired by snipping off a small portion of the animals tail (~lmm) and collecting 15μl blood into a heparinized capillary tube for analysis. Following GK activator administration, additional blood glucose readings are taken at 1, 2, 4 and 6 hours post dose from the same tail wound. Results are interpreted by comparing the mean blood glucose values of six vehicle treated mice with six GK activator treated mice over the six hour study duration. Compounds are considered active when they exhibit a statistically significant (p ≤ 0.05) decrease in blood glucose compared to vehicle for two consecutive assay time points.
The compounds of Examples 1, 18, 22, 23.1, 25.1, 26, 14, 15, 31, 33 were tested and found to have excellent glucokinase activator in vivo activity when administered orally in accordance with the assay described in Biological Activity Example B. Example A Tablets containing the following ingredients can be produced in a conventional manner:
Ingredients mg per tablet
Compound of formula I 10.0 - 100.0
Lactose 125.0
Corn starch 75.0
Talc 4.0 Magnesium stearate 1.0
Example B Capsules containing the following ingredients can be produced in a conventional manner:
Ingredients mg per capsule
Compound of formula I 25.0
Lactose 150.0
Corn starch 20.0
Talc 5.0

Claims

Claims
1. A compound comprising an amide of the formula:
Figure imgf000062_0001
wherein
A is unsubstituted phenyl or phenyl which may be mono- or di-substituted with halo or mono-substituted with lower alkyl sulfonyl, lower alkyl thio or nitro;
R1 is cycloalkyl having from 3 to 9 carbon atoms or lower alkyl having from 2 to 4 carbon atoms;
R2 is an unsubstituted or mono-substituted five- or six-membered heteroaromatic ring connected by a ring carbon atom to the amine group shown, which five- or six- membered heteroaromatic ring contains from 1 to 3 heteroatoms selected from sulfur, oxygen or nitrogen, with one heteroatom being nitrogen which is adjacent to the connecting ring carbon atom, which ring is monocyclic ring or fused with phenyl at two of its ring carbons, said mono-substituted heteroaromatic ring being monosubstituted at a position on a ring carbon atom other than adjacent to said connecting carbon atom with a substituent selected from the group consisting of halo, lower alkyl, nitro, cyano, perfluoro-lower alkyl; hydroxy, -(CH2)n-OR3, -
(CH2)n-C(O)-OR3, -(CH2)n-C(O)-NH-R3, -C(O)C(O)-OR3, or -(CH2)n-NHR3:
R is hydrogen or lower alkyl; and
n is O, 1, 2, 3 or 4;
or a pharmaceutically acceptable salts or N-oxides thereof.
2. A compound according to claim 1, wherein said compound is said amide or a pharmaceutically acceptable salts thereof.
3. A compound according to claim 2, wherein A is unsubstituted phenyl or phenyl which maybe substituted with fluoro, lower alkyl sulfonyl or lower alkyl thio at position 4 or 7, or with chloro at position 5 or 6 or 5 and 6, or with bromo or nitro at position 5 or 6.
4. A compound according to any of claims 1 to 3, wherein the amide is in the S configuration at the asymmetric carbon shown.
5. A compound according to any of claims 1, 2 or 4, wherein A is unsubstituted phenyl or phenyl which may be mono- or di-substituted with halo or mono-substituted with lower alkyl sulfonyl or nitro.
6. A compound according to any of claims 1, 2 or 4, wherein A is unsubstituted phenyl or phenyl monosubstituted by halo.
7. A compound according to any of claims 1 to 6, wherein R1 is cycloalkyl having from 3 to 9 carbon atoms.
8. A compound according to any of claims 1 to 6, wherein R1 is cyclopentyl or cyclohexyl.
9. A compound according to any of claims 1 to 8, wherein R2 is an unsubstituted or mono-substituted five- or six-membered heteroaromatic ring connected by a ring carbon atom to the amine group shown, which five- or six-membered heteroaromatic ring contains 1 or 2 heteroatoms selected from sulfur, oxygen or nitrogen, with one heteroatom being nitrogen which is adjacent to the connecting ring carbon atom, which ring is a monocyclic ring or fused with phenyl at two of its ring carbons, said mono- substituted heteroaromatic ring being monosubstituted at a position on a ring carbon atom other than adjacent to said connecting carbon atom with a substituent selected from the group consisting of halo or lower alkyl.
10. A compound according to any of claims 1 to 8, wherein R2 is a heteroaromatic ring selected from thiazolyl, quinolinyl, pyridyl, pyrimidyl, pyrazinyl, imidazolyl, benzoimidazolyl, benzothiazolyl or benzooxazolyl, said heteroaromatic ring being optionally monosubstituted by halo or lower alkyl.
11. A compound according to any of claims 1 to 8, wherein R2 is a heteroaromatic ring selected from thiazolyl, pyrimidyl, pyrazinyl or pyridyl, said heteroaromatic ring being optionally monosubstituted by halo or lower alkyl.
12. A compound according to any of claims 1 to 8, wherein R2 is an unsubstituted heteroaromatic ring selected from thiazolyl, pyrimidyl, pyrazinyl or pyridyl or a monosubstituted heteroaromatic ring selected from thiazolyl substituted by chloro or pyridyl substituted by chloro, bromo or lower alkyl.
13. A compound according to claim 1, wherein A is unsubstituted phenyl or phenyl which may be mono- or di-substituted with halo or mono-substituted with lower alkyl sulfonyl or nitro; R1 is cycloalkyl having from 5 to 8 carbon atoms; R2 is an unsubstituted or mono-substituted five- or six-membered heteroaromatic ring connected by a ring carbon atom to the amine group shown, which five- or six- membered heteroaromatic ring contains 1 or 2 heteroatoms selected from sulfur, oxygen or nitrogen, with one heteroatom being nitrogen which is adjacent to the connecting ring carbon atom, which ring is a monocyclic ring or fused with phenyl at two of its ring carbons, said mono-substituted heteroaromatic ring being monosubstituted at a position on a ring carbon atom other than adjacent to said connecting carbon atom with a substituent selected from the group consisting of halo or lower alkyl.
14. A compound of any of claims 1 to 13 selected from the group consisting of:
(S) -3-cyclohexyl-2- ( 1 -oxo- 1 ,3-dihydro-isoindol-2-yl) -N-pyridin-2-yl-propionamide,
(S)-3-cyclohexyl-2-(4-fluoro-l-oxo-l,3-dihydro-isoindol-2-yl)-N-pyridin-2-yl- propionamide,
(S)-3-cyclohexyl-2-(7-fluoro-l-oxo-l,3-dihydro-isoindol-2-yl)-N-pyridin-2-yl- propionamide,
(S)-3-cyclohexyl-2-(4-chloro-l-oxo-l,3-dihydro-isoindol-2-yl)-N-pyridin-2-yl- propionamide,
(S)-3-cyclohexyl-2-(7-chloro-l-oxo-l,3dihydro-isoindol-2-yl)-N-pyridin-2-yl- propionamide, (R)-N-(5-bromo-p7ridin-2-7l)-3-cyclohexyl-2-(l-oxo-l,3-dihydro-isoindol-2-7l)- propionamide,
(S)-3-cyclohex7l-2-(l-oxo-l,3-dihydro-isoindol-2-yl)-N-5-chloro-pyridin-2-7l- propionamide,
(S)-3-c7clohex7l-2-(l-oxo-l,3-dih7dro-isoindol-2-7l)-N-4-meth7l-pτridin-2-7l- propionamide,
(S)-3-cyclohexyl-2-(l-oxo-l,3-dihydro-isoindol-2-yl)-N-5-methyl-pyridin-2-yl- propionamide,
3-cyclohexyl-2-(l-oxo-l,3-dihydro-isoindol-2-yl)-N-pyrimidin-4-yl-propionamide,
(S)-3-cyclohexyl-2-(4-methylsulfonyl-l-oxo-l,3-dihydro-isoindol-2-yl)-N-pyrimidin- 4-yl-propionamide,
(S)- 3-cyclohexyl-2-(7-methylsulfonyl-l-oxo-l,3-dihydro-isoindol-2-yl)-N-pyrimidin- 4-yl-propionamide,
(S)-N-3-cyclohexyl-N-(2-methyl-pyrimidin-4-yl)-2-(l-oxo-l,3-dihydro-isoindol-2-yl)- propionamide,
(S)-3-cyclohexyl-2-(l-oxo-l,3-dihydro-isoindol-2-yl)-N-thiazol-2-yl-propionamide,
(R)-3-cyclohexyl-2-(l-oxo-l,3-dihydro-isoindol-2-yl)-N-thiazol-2-yl-propionamide,
(S)-3-cyclohexyl-2-(5,6-dichloro-l-oxo-l,3-dihydro-isoindol-2-yl)-N-thiazol-2-yl- propionamide,
(S)-3-cyclohexyl-2-(4-chloro-l-oxo-l,3-dihydro-isoindol-2-yl)-N-thiazol-2-yl- propionamide,
(S)-3-cyclohexyl-2-(4-fiuoro-l-oxo-l,3-dihydro-isoindol-2-yl)-N-thiazol-2-yl- propionamide,
(S)-3-cyclohexyl-2-(7-fluoro-l-oxo-l,3-dihydro-isoindol-2-yl)-N-thiazol-2-yl- propionamide,
(S)-3-cyclohexyl-2-(4-methylsulfonyl-l-oxo-l,3-dihydro-isoindol-2-yl)-N-thiazol-2-yl- propionamide, (S)-3-cyclohexyl-2-(7-methylsulfonyl-l-oxo-l,3-dihydro-isoindol-2-yl)-N-thiazol-2-yl- propionamide,
(S)-3-cyclohexyl-2-(5-nitro-l-oxo-l,3-dihydro-isoindol-2-yl)-N-thiazol-2-yl - propionamide,
(S)-3-cyclohexyl-2-(6-nitro-l-oxo-l,3-dihydro-isoindol-2-yl)-N-thiazol-2-yl- propionamide,
(S)-N-(5-chloro-thiazol-2-yl)-3-cyclohexyl-2-(l-oxo-l,3-dihydro-isoindol-2-yl) propionamide,
(S)-N-(5-bromo-thiazol-2-yl)-3-cyclohexyl-2-(l-oxo-l,3-dihydro-isoindol-2-yl)- propionamide,
(S)-N-(5-chloro-thiazol-2-yl)-3-cyclohexyl-2-(5,6-dichloro-l-oxo-l,3-dihydro- isoindol-2-yl)-propionamide,
(S)-N-(5-bromo-thiazol-2-yl)-3-cyclohexyl— 2-(5,6-dichloro-l-oxo-l,3-dihydro- isoindol-2-yl)-propionamide,
(S)-N-(5-chloro-thiazol-2-yl)-3-cyclohexyl-2-(4-chloro-l-oxo-l,3-dihydro-isoindol-2- yl) -propionamide,
(S)-N-(5-chloro-thiazol-2-yl)-3-cyclohexyl-2-(7-chloro-l-oxo-l,3-dihydro-isoindol-2- yl)-propionamide,
(S)-N-(5-chloro-thiazol-2-yl)-3-cyclohexyl-2-(5-nitro-l-oxo-l,3-dihydro-isoindol-2- yl) -propionamide,
(S)-N-(5-chloro-thiazol-2-yl)-3-cyclohexyl-2-(6-nitro-l-oxo-l,3-dihydro-isoindol-2- yl) -propionamide,
(S)-N-(5-chloro-thiazol-2-yl)-3-cyclohexyl-2-(4-fluoro-l-oxo-l,3-dihydro-isoindol-2- yl) -propionamide,
(S)-N-(5-chloro-thiazol-2-yl)-3-cyclohexyl-2-(7-fluoro-l-oxo-l,3-dihydro-isoindol-2- yl) -propionamide, (S)-3-cyclohexyl-2-(4-fluoro-l-oxo-l,3dihydro-isoindol-2-yl)-N- pyrazin-2-yl- propionamide,
(S)-3-cyclohexyl-2-(7-fluoro-l-oxo-l,3-dihydro-isoindol-2-yl)-N-pyrazin-2-yl- propionamide,
(S)-3-cyclohexyl-2-(4-methylsulfonyl-l-oxo-l,3-dihydro-isoindol-2-yl)-N-pyrazin-2- yl-propionamide,
(S)-3-cyclohexyl-2-(7-methylsulfonyl-l-oxo-l,3-dihydro-isoindol-2-yl)-N-pyrazin-2- yl-propionamide,
(S)-3-cyclohexyl-2-(l-oxo-l,3-dihydro-isoindol-2-yl)-N-pyrazin-2-yl-propionamide,
(S)-3-cyclohexyl-2-(4-chloro-l-oxo-l,3-dihydro-isoindol-2-yl)-N-pyrazin-2-yl- propionamide,
(S)-3-cyclohexyl-N-(lH-imidazol-2-yl)-2-(l-oxo-l,3-dihydro-isoindol-2-yl) propionamide,
3-cyclopentyl-2-(l-oxo-l,3-dihydro-isoindol-2-yl)-N-thiazol-2-yl-propionamide,
N-(5-chloro-thiazol-2-yl)-3-cyclopentyl-2-(l-oxo-l,3-dihydro-isoindol-2-yl)- propionamide,
3-cycloheptyl-2-(l-oxo-l,3-dihydro-isoindol-2-yl)-N-thiazol-2-yl-propionamide,
N- (5-chloro-thiazol-2-yl) -3-cycloheptyl-2- ( 1 -oxo- l,3-dihydro-isoindol-2-yl)- propionamide,
3-cyclooctyl-2-(l-oxo-l,3-dihydro-isoindol-2-yl)-N-thiazol-2-yl-propionamide,
(S)-N-benzothiazol-2-yl-3-cyclohexyl-2-(l-oxo-l,3-dihydro-isoindol-2-yl)- propionamide,
(S)-N-(lH-benzoimidazol-2-yl)-3-cyclohexyl-2-(l-oxo-l,3-dihydro-isoindol-2-yl)- propionamide,
(S)-N-benzooxazol-2-yl-3-cyclohexyl-2-(l-oxo-l,3-dihydro-isoindol-2-yl)- propionamide, (S)-3-cyclohexyl-2-(l-oxo-l,3-dihydro-isoindol-2-yl)-N-quinolin-2-yl-propionamide,
(S)-3-Cyclohexyl-2-(7-chloro-l-oxo-l,3-dihydro-isoindol-2-yl)-N-pyrazin-2-yl- propionamide,
(S)-3-cyclohexyl-2-(l-oxo-l,3-dihydro-isoindol-2-yl)-N-(l-oxy-pyridin-2-yl)- propionamide, and
(S)-3-cyclohexyl-2-(7-cUoro-l-oxo-l,3dihydro-isoindol-2-yl)-N-thiazol-2-yl- propionamide.
15. A compound of any of claims 1 to 13 selected from the group consisting of:
3-Cyclohexyl-2-(l-oxo-l,3-dihydro-isoindol-2-yl)-N-pyrimidin-4-yl-propionamide,
N-(5-Chloro-thiazol-2-yl)-3-cyclopentyl-2-(l-oxo-l,3-dihydro-isoindol-2-yl)- propionamide,
(S)-3-Cyclohexyl-2-(l-oxo-l,3-dihydro-isoindol-2-yl)-N-5-chloro-pyridin-2-yl- propionamide,
(S)-3-Cyclohexyl-2-(4-fluoro-l-oxo-l,3dihydro-isoindol-2-yl)-N- pyrazin-2-yl- propionamide,
(S)-3-Cyclohexyl-2-(4-fluoro-l-oxo-l,3-dihydro-isoindol-2-yl)-N-thiazol-2-yl- propionamide,
(S)-3-Cyclohexyl-2-(l-oxo-l,3-dihydro-isoindol-2-yl)-N-pyrazin-2-yl-propionamide,
(S)-3-Cyclohexyl-2-(l-oxo-l,3-dihydro-isoindol-2-yl)-N-pyridin-2-yl-propionamide,
(S)-3-cyclohexyl-2-(l-oxo-l,3-dihydro-isoindol-2-yl)-N-thiazol-2-yl-propionamide,
(S)-3-Cyclohexyl-2-(l-oxo-l,3-dihydro-isoindol-2-yl)-N-5-methyl-pyridin-2-yl- propionamide, and
(R)-N-(5-Bromo-pyridin-2-yl)-3-cyclohexyl-2-(l-oxo-l,3-dihydro-isoindol-2-yl)- propionamide.
16. A pharmaceutical composition comprising a compound of any of claims 1 to 15 and a pharmaceutically acceptable carrier and/or adjuvant.
17. A process for the preparation of a pharmaceutical composition of claim 16 comprising combining a compound of formula I according to any one of claims 1 to 15 with a pharmaceutically acceptable carrier and/or adjuvant.
18. The compounds according to any of claims 1 to 15 for use as a therapeutic active substance.
19. The use of the compounds according to any of claims 1 to 15 for the treatment or prophylaxis of type II diabetes.
20. The use of a compound according to any of claims 1 to 15 for the preparation of a medicament for the treatment or prophylaxis of type II diabetes.
21. A method for the prophylactic or therapeutic treatment of type II diabetes, which method comprises administering a compound of any of claims 1 to 15 to a human being or an animal.
22. A process for the preparation of a compound according to any of claims 1 to 15, said process comprising:
coupling a compound of the formula 3:
Figure imgf000069_0001
wherein A and R1 are as defined in claim 1;
with a suitable heteroaromatic amine of the formula
H2N-R2 wherein R2 is as defined in claim 1;
under conventional reaction conditions for amide bond formation to obtain a compound of formula I:
Figure imgf000070_0001
wherein *, A, R1 and R2 are as defined in claim 1.
23. A compound prepared by the processes according to claim 22.
24. The invention as hereinbefore defined.
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BR0116169-5A BR0116169A (en) 2000-12-13 2001-12-07 Compound, pharmaceutical composition comprising such compound, process for preparing a pharmaceutical composition, use of the compounds, process for the prophylactic or therapeutic treatment of type ii diabetes and process for the preparation of the compound.
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