WO2006027243A1 - Verfahren zur reduktion von alkinverbindungen - Google Patents
Verfahren zur reduktion von alkinverbindungen Download PDFInfo
- Publication number
- WO2006027243A1 WO2006027243A1 PCT/EP2005/009655 EP2005009655W WO2006027243A1 WO 2006027243 A1 WO2006027243 A1 WO 2006027243A1 EP 2005009655 W EP2005009655 W EP 2005009655W WO 2006027243 A1 WO2006027243 A1 WO 2006027243A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- zinc
- ammonium
- reduction
- formula
- ammonium salt
- Prior art date
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C403/00—Derivatives of cyclohexane or of a cyclohexene or of cyclohexadiene, having a side-chain containing an acyclic unsaturated part of at least four carbon atoms, this part being directly attached to the cyclohexane or cyclohexene or cyclohexadiene rings, e.g. vitamin A, beta-carotene, beta-ionone
- C07C403/24—Derivatives of cyclohexane or of a cyclohexene or of cyclohexadiene, having a side-chain containing an acyclic unsaturated part of at least four carbon atoms, this part being directly attached to the cyclohexane or cyclohexene or cyclohexadiene rings, e.g. vitamin A, beta-carotene, beta-ionone having side-chains substituted by six-membered non-aromatic rings, e.g. beta-carotene
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C403/00—Derivatives of cyclohexane or of a cyclohexene or of cyclohexadiene, having a side-chain containing an acyclic unsaturated part of at least four carbon atoms, this part being directly attached to the cyclohexane or cyclohexene or cyclohexadiene rings, e.g. vitamin A, beta-carotene, beta-ionone
- C07C403/06—Derivatives of cyclohexane or of a cyclohexene or of cyclohexadiene, having a side-chain containing an acyclic unsaturated part of at least four carbon atoms, this part being directly attached to the cyclohexane or cyclohexene or cyclohexadiene rings, e.g. vitamin A, beta-carotene, beta-ionone having side-chains substituted by singly-bound oxygen atoms
- C07C403/08—Derivatives of cyclohexane or of a cyclohexene or of cyclohexadiene, having a side-chain containing an acyclic unsaturated part of at least four carbon atoms, this part being directly attached to the cyclohexane or cyclohexene or cyclohexadiene rings, e.g. vitamin A, beta-carotene, beta-ionone having side-chains substituted by singly-bound oxygen atoms by hydroxy groups
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C2601/00—Systems containing only non-condensed rings
- C07C2601/12—Systems containing only non-condensed rings with a six-membered ring
- C07C2601/16—Systems containing only non-condensed rings with a six-membered ring the ring being unsaturated
Definitions
- the present invention relates to a novel process for the reduction of alkyne compounds, in particular the invention relates to a process for the preparation of cyclohexene derivatives which are suitable as intermediates for the preparation of carotenoids.
- EP-A-0 005 748 relates to a further process for the preparation of astaxanthin in which the partial reduction of the alkynediol of formula IIIa is also carried out with zinc / acetic acid in methylene chloride.
- a disadvantage of the described zinc / acetic acid reduction is the insufficient selectivity of the method.
- Undesirable by-products such as the formation of spiro compounds, which can not be converted into the desired secondary products in the further course of the synthesis, can lead to significant yield losses.
- Further reduction processes are described, inter alia, in J. Amer. OiI Chem. Soc. 49 (1972) 72, in which the reduction of triple bonds to cis double bonds in long-chain, conjugated fatty acids with zinc takes place in boiling protic solvents.
- This method has the disadvantage that the preparation of the reagent is very expensive and also the reagent must always be freshly prepared.
- EP 1 197 483 A2 describes a process for the catalytic reduction of alkyne compounds, characterized in that the reducing agent used is a mixture of zinc and at least one compound selected from the group consisting of ammonium salts, copper salts, alkali metals and alkaline earth metal salts.
- R 5 is hydrogen, C 1 -C 4 acyl
- R 6 to R 8 are hydrogen, C 1 -C 6 -alkyl, aryl;
- Suitable alkyl radicals for R 3 and R 4 are linear or branched C 1 -C 4 -alkyl chains, for example methyl, ethyl, n-propyl, 1-methylethyl, n-butyl, 1-methylpropyl, 2-methylpropyl and 1, Called 1-dimethylethyl.
- Preferred alkyl radicals are methyl and ethyl.
- radicals R 3 and R 4 may also together with the carbon atom to which they are attached form a cycloheptyl or cyclohexyl ring.
- Suitable substituents for R 5 are linear or branched C 1 -C 4 -acyl chains, for example formyl, acetyl, propionyl, isopropionyl.
- Preferred acyl radical is acetyl.
- a protective group for R 2 which can be converted by hydrolysis into a hydroxy group includes those functional groups which can be converted into the hydroxy group relatively easily. Mention may be made, for example, of ether groups, such as
- Silyl ether groups such as -O-Si (CH 3 ) 3 , -O-Si (CH 2 CHs) 3 , -O-Si (iso-propyl) 3 L -O-Si (CH 3 ) 2 (tert-butyl) and -O-Si (CH 3 ) 2 (n-hexyl) or substituted methyl ether groups, such as the ⁇ -alkoxy-alkyl ether groups of the formulas
- pyranyl ether groups such as the tetrahydropyranyloxy group and the 4-methyl-5,6-dihydro-2H-pyranyloxy group.
- Alkyl radicals for R 6 to R 8 are linear or branched C 1 -C 6 -alkyl chains, for example methyl, ethyl, n-propyl, 1-methylethyl, n-butyl, 1-methylpropyl, 2-methylpropyl, 1, 1 -Dimethylethyl, n-pentyl, 1-methylbutyl, 2-methylbutyl, 3-methylbutyl, 2,2-dimethylpropyl, 1-ethylpropyl, n-hexyl, 1, 1-dimethylpropyl, 1, 2-dimethylpropyl, 1-methylpentyl , 2-methylpentyl, 3-methylpentyl, 4-methylpentyl, 1, 1-dimethylbutyl, 1, 2-dimethylbutyl, 1, 3-dimethylbutyl, 2,2-dimethylbutyl, 2,3-dimethylbutyl, 3,3-dimethylbutyl , 1-ethylbutyl, 2-eth
- a particularly preferred radical for R 6 to R 8 is hydrogen.
- Aryl is to be understood as meaning aromatic rings or ring systems having 6 to 18 carbon atoms in the ring system, for example phenyl or naphthyl optionally containing one or more radicals such as halogen, for example fluorine, chlorine or bromine, amino, C 4 -C 4 -alkylamino, C 1 -C 4 Dialkylamino, hydroxy, C 1 -C 4 -AlkVl, C r C 4 alkoxy or other radicals may be substituted. Preference is given to substituted or unsubstituted phenyl, methoxyphenyl and naphthyl.
- Y ⁇ is generally an anion of an organic or inorganic acid.
- organic acids include aliphatic and aromatic carboxylic acids, spielnem benzoic acid or Ci-Ci 2 alkanoic acids, preferably Ci-C ⁇ -alkanoic acids such as formic acid, acetic acid, propionic acid, butyric acid and caproic acid, particularly preferably acetic acid, or dicarboxylic acids such as oxalic acid, malonic acid or succinic acid.
- Y can also be anions of organic sulfonic acids such as methanesulfonate or para-toluenesulfonate.
- inorganic acids are i.a. Hydrochloric acid, hydrobromic acid, carbonic acid, sulfuric acid, sulfurous acid, nitric acid, nitrous acid and phosphoric acid.
- Formula V selected from the group consisting of ammonium chloride, ammonium carbonate, ammonium bicarbonate, ammonium sulfate and ammonium acetate ver ⁇ used.
- the substituents R 6 to R 8 are in this case together hydrogen.
- ammonium salt ammonium chloride may be mentioned.
- the process according to the invention is particularly suitable for the preparation of the cyclohexene compounds of the formulas Ia and IIa.
- the amount of water is chosen so that the compound B is dissolved or partially dissolved.
- 15 to 500 ml of water preferably 20 to 400 ml, particularly preferably 30 to 250 ml of water are used per mole of zinc used.
- Suitable inert solvents in the process according to the invention are in general all solvents which are inert to the compounds I to IV. Preference is given to working in chlorinated hydrocarbons, for example in dichloromethane, perchlorethylene or in chloroform or in an ethereal solvent, such as dialkyl ethers, tetrahydrofuran or dioxane, in particular in the water-immiscible methyl tert-butyl ether.
- Other solvents include aromatic hydrocarbons, in particular toluene and C 1 -C 3 -alcohols, such as methanol, ethanol or propanol.
- a 10 to 50% by weight solution of the alkynediol in one of the above-mentioned is particularly preferably used a 15 to 30 wt .-% solution of the alkynediol in methylene chloride.
- the zinc used is used in an amount of about 0.5 to 5, preferably 0.7 to 3, more preferably 1 to 2, most preferably 1, 1 to 1, 5 gram atoms per mole of the alkynediol to be reduced.
- the dosage of the zinc can be carried out in one or more portions.
- the reduction can be carried out at temperatures between 0 ° C. and the boiling point of the corresponding solvent.
- Preferred reaction temperatures are in the range of 10 to 80 0 C, more preferably in the range of 35-45 ° C.
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Catalysts (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA002577044A CA2577044A1 (en) | 2004-09-10 | 2005-09-08 | Method for reducing alkine compounds |
US11/662,440 US20070219383A1 (en) | 2004-09-10 | 2005-09-08 | Method for Reducing Alkyne Compuonds |
EP05785744A EP1794119A1 (de) | 2004-09-10 | 2005-09-08 | Verfahren zur reduktion von alkinverbindungen |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102004044262A DE102004044262A1 (de) | 2004-09-10 | 2004-09-10 | Verfahren zur katalytischen Reduktion von Alkinverbindungen |
DE102004044262.2 | 2004-09-10 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2006027243A1 true WO2006027243A1 (de) | 2006-03-16 |
Family
ID=35262035
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2005/009655 WO2006027243A1 (de) | 2004-09-10 | 2005-09-08 | Verfahren zur reduktion von alkinverbindungen |
Country Status (6)
Country | Link |
---|---|
US (1) | US20070219383A1 (de) |
EP (1) | EP1794119A1 (de) |
CN (1) | CN101014567A (de) |
CA (1) | CA2577044A1 (de) |
DE (1) | DE102004044262A1 (de) |
WO (1) | WO2006027243A1 (de) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2012139891A1 (de) | 2011-04-15 | 2012-10-18 | Bayer Cropscience Ag | Substituierte vinyl- und alkinyl-cyclohexenole als wirkstoffe gegen abiotischen pflanzenstress |
WO2014086751A1 (de) | 2012-12-05 | 2014-06-12 | Bayer Cropscience Ag | Verwendung substituierter 1-(arylethinyl)-, 1-(heteroarylethinyl)-, 1-(heterocyclylethinyl)- und 1-(cyloalkenylethinyl)-cyclohexanole als wirkstoffe gegen abiotischen pflanzenstress |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1197483A2 (de) * | 2000-09-28 | 2002-04-17 | Basf Aktiengesellschaft | Verfahren zur katalytischen Reduktion von Alkinverbindungen |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10140180A1 (de) * | 2001-08-22 | 2003-03-06 | Basf Ag | Verfahren zur selektiven Reduktion von Alkinverbindungen |
-
2004
- 2004-09-10 DE DE102004044262A patent/DE102004044262A1/de not_active Withdrawn
-
2005
- 2005-09-08 CN CNA200580030058XA patent/CN101014567A/zh active Pending
- 2005-09-08 CA CA002577044A patent/CA2577044A1/en not_active Abandoned
- 2005-09-08 WO PCT/EP2005/009655 patent/WO2006027243A1/de active Application Filing
- 2005-09-08 US US11/662,440 patent/US20070219383A1/en not_active Abandoned
- 2005-09-08 EP EP05785744A patent/EP1794119A1/de not_active Withdrawn
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1197483A2 (de) * | 2000-09-28 | 2002-04-17 | Basf Aktiengesellschaft | Verfahren zur katalytischen Reduktion von Alkinverbindungen |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2012139891A1 (de) | 2011-04-15 | 2012-10-18 | Bayer Cropscience Ag | Substituierte vinyl- und alkinyl-cyclohexenole als wirkstoffe gegen abiotischen pflanzenstress |
WO2014086751A1 (de) | 2012-12-05 | 2014-06-12 | Bayer Cropscience Ag | Verwendung substituierter 1-(arylethinyl)-, 1-(heteroarylethinyl)-, 1-(heterocyclylethinyl)- und 1-(cyloalkenylethinyl)-cyclohexanole als wirkstoffe gegen abiotischen pflanzenstress |
Also Published As
Publication number | Publication date |
---|---|
US20070219383A1 (en) | 2007-09-20 |
DE102004044262A1 (de) | 2006-03-16 |
EP1794119A1 (de) | 2007-06-13 |
CA2577044A1 (en) | 2006-03-16 |
CN101014567A (zh) | 2007-08-08 |
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