WO2001000592A1 - Verfahren zur herstellung von 4,6-dichlorpyrimidin mit säurechloriden - Google Patents
Verfahren zur herstellung von 4,6-dichlorpyrimidin mit säurechloriden Download PDFInfo
- Publication number
- WO2001000592A1 WO2001000592A1 PCT/EP2000/005400 EP0005400W WO0100592A1 WO 2001000592 A1 WO2001000592 A1 WO 2001000592A1 EP 0005400 W EP0005400 W EP 0005400W WO 0100592 A1 WO0100592 A1 WO 0100592A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- weight
- parts
- methoxypyrimidine
- chloro
- dichloropyrimidine
- Prior art date
Links
- 239000002253 acid Substances 0.000 title claims description 10
- 150000001805 chlorine compounds Chemical class 0.000 title claims description 10
- XJPZKYIHCLDXST-UHFFFAOYSA-N 4,6-dichloropyrimidine Chemical compound ClC1=CC(Cl)=NC=N1 XJPZKYIHCLDXST-UHFFFAOYSA-N 0.000 title abstract description 30
- 238000004519 manufacturing process Methods 0.000 title description 3
- KLJGSQVYUGQOAW-UHFFFAOYSA-N 4-chloro-6-methoxypyrimidine Chemical compound COC1=CC(Cl)=NC=N1 KLJGSQVYUGQOAW-UHFFFAOYSA-N 0.000 claims abstract description 36
- NGNBDVOYPDDBFK-UHFFFAOYSA-N 2-[2,4-di(pentan-2-yl)phenoxy]acetyl chloride Chemical compound CCCC(C)C1=CC=C(OCC(Cl)=O)C(C(C)CCC)=C1 NGNBDVOYPDDBFK-UHFFFAOYSA-N 0.000 claims abstract description 16
- 229910000039 hydrogen halide Inorganic materials 0.000 claims abstract description 15
- 239000012433 hydrogen halide Substances 0.000 claims abstract description 15
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 24
- IXCSERBJSXMMFS-UHFFFAOYSA-N hydrogen chloride Substances Cl.Cl IXCSERBJSXMMFS-UHFFFAOYSA-N 0.000 claims description 24
- 229910000041 hydrogen chloride Inorganic materials 0.000 claims description 24
- 238000000034 method Methods 0.000 claims description 21
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 claims description 8
- 239000000460 chlorine Substances 0.000 claims description 8
- 229910052801 chlorine Inorganic materials 0.000 claims description 8
- 150000001875 compounds Chemical class 0.000 claims description 8
- 238000011065 in-situ storage Methods 0.000 claims description 7
- -1 C r C 10 - alkoxy Chemical compound 0.000 claims description 5
- 238000002360 preparation method Methods 0.000 claims description 5
- 229910052739 hydrogen Inorganic materials 0.000 claims description 4
- 239000001257 hydrogen Substances 0.000 claims description 4
- 125000003545 alkoxy group Chemical group 0.000 claims description 3
- 125000004104 aryloxy group Chemical group 0.000 claims description 3
- 101000939500 Homo sapiens UBX domain-containing protein 11 Proteins 0.000 claims description 2
- 102100029645 UBX domain-containing protein 11 Human genes 0.000 claims description 2
- 125000000217 alkyl group Chemical group 0.000 claims description 2
- 125000003118 aryl group Chemical group 0.000 claims description 2
- 125000005553 heteroaryloxy group Chemical group 0.000 claims description 2
- 125000005842 heteroatom Chemical group 0.000 claims description 2
- 229910052760 oxygen Inorganic materials 0.000 claims description 2
- 229910052717 sulfur Inorganic materials 0.000 claims description 2
- XHXFXVLFKHQFAL-UHFFFAOYSA-N phosphoryl trichloride Chemical compound ClP(Cl)(Cl)=O XHXFXVLFKHQFAL-UHFFFAOYSA-N 0.000 description 22
- 239000011541 reaction mixture Substances 0.000 description 16
- 238000006243 chemical reaction Methods 0.000 description 13
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 description 12
- 239000000203 mixture Substances 0.000 description 12
- 239000007789 gas Substances 0.000 description 9
- 238000004128 high performance liquid chromatography Methods 0.000 description 9
- 239000002904 solvent Substances 0.000 description 9
- MVPPADPHJFYWMZ-UHFFFAOYSA-N chlorobenzene Chemical compound ClC1=CC=CC=C1 MVPPADPHJFYWMZ-UHFFFAOYSA-N 0.000 description 6
- 238000004821 distillation Methods 0.000 description 6
- 238000003756 stirring Methods 0.000 description 6
- RFFLAFLAYFXFSW-UHFFFAOYSA-N 1,2-dichlorobenzene Chemical compound ClC1=CC=CC=C1Cl RFFLAFLAYFXFSW-UHFFFAOYSA-N 0.000 description 4
- YGYAWVDWMABLBF-UHFFFAOYSA-N Phosgene Chemical compound ClC(Cl)=O YGYAWVDWMABLBF-UHFFFAOYSA-N 0.000 description 4
- 238000005660 chlorination reaction Methods 0.000 description 4
- FAIAAWCVCHQXDN-UHFFFAOYSA-N phosphorus trichloride Chemical compound ClP(Cl)Cl FAIAAWCVCHQXDN-UHFFFAOYSA-N 0.000 description 4
- FYSNRJHAOHDILO-UHFFFAOYSA-N thionyl chloride Chemical compound ClS(Cl)=O FYSNRJHAOHDILO-UHFFFAOYSA-N 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- WEVYAHXRMPXWCK-UHFFFAOYSA-N Acetonitrile Chemical compound CC#N WEVYAHXRMPXWCK-UHFFFAOYSA-N 0.000 description 3
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 3
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 3
- JFDZBHWFFUWGJE-UHFFFAOYSA-N benzonitrile Chemical compound N#CC1=CC=CC=C1 JFDZBHWFFUWGJE-UHFFFAOYSA-N 0.000 description 3
- 239000003054 catalyst Substances 0.000 description 3
- 239000012320 chlorinating reagent Substances 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- CPELXLSAUQHCOX-UHFFFAOYSA-N Hydrogen bromide Chemical compound Br CPELXLSAUQHCOX-UHFFFAOYSA-N 0.000 description 2
- YNAVUWVOSKDBBP-UHFFFAOYSA-N Morpholine Chemical compound C1COCCN1 YNAVUWVOSKDBBP-UHFFFAOYSA-N 0.000 description 2
- JUJWROOIHBZHMG-UHFFFAOYSA-N Pyridine Chemical compound C1=CC=NC=C1 JUJWROOIHBZHMG-UHFFFAOYSA-N 0.000 description 2
- 238000007792 addition Methods 0.000 description 2
- 125000001931 aliphatic group Chemical group 0.000 description 2
- 239000003849 aromatic solvent Substances 0.000 description 2
- 239000000284 extract Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- UAEPNZWRGJTJPN-UHFFFAOYSA-N methylcyclohexane Chemical compound CC1CCCCC1 UAEPNZWRGJTJPN-UHFFFAOYSA-N 0.000 description 2
- 150000007524 organic acids Chemical class 0.000 description 2
- FIQMHBFVRAXMOP-UHFFFAOYSA-N triphenylphosphane oxide Chemical compound C=1C=CC=CC=1P(C=1C=CC=CC=1)(=O)C1=CC=CC=C1 FIQMHBFVRAXMOP-UHFFFAOYSA-N 0.000 description 2
- RIOQSEWOXXDEQQ-UHFFFAOYSA-N triphenylphosphine Chemical compound C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1 RIOQSEWOXXDEQQ-UHFFFAOYSA-N 0.000 description 2
- GETTZEONDQJALK-UHFFFAOYSA-N (trifluoromethyl)benzene Chemical compound FC(F)(F)C1=CC=CC=C1 GETTZEONDQJALK-UHFFFAOYSA-N 0.000 description 1
- DUFGYCAXVIUXIP-UHFFFAOYSA-N 4,6-dihydroxypyrimidine Chemical compound OC1=CC(O)=NC=N1 DUFGYCAXVIUXIP-UHFFFAOYSA-N 0.000 description 1
- ZCYVEMRRCGMTRW-UHFFFAOYSA-N 7553-56-2 Chemical compound [I] ZCYVEMRRCGMTRW-UHFFFAOYSA-N 0.000 description 1
- FXHOOIRPVKKKFG-UHFFFAOYSA-N N,N-Dimethylacetamide Chemical compound CN(C)C(C)=O FXHOOIRPVKKKFG-UHFFFAOYSA-N 0.000 description 1
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 description 1
- 150000001298 alcohols Chemical class 0.000 description 1
- 150000001335 aliphatic alkanes Chemical class 0.000 description 1
- 150000001350 alkyl halides Chemical class 0.000 description 1
- 150000001408 amides Chemical class 0.000 description 1
- 150000001412 amines Chemical class 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- KCXMKQUNVWSEMD-UHFFFAOYSA-N benzyl chloride Chemical class ClCC1=CC=CC=C1 KCXMKQUNVWSEMD-UHFFFAOYSA-N 0.000 description 1
- 235000013877 carbamide Nutrition 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 150000001924 cycloalkanes Chemical class 0.000 description 1
- ASWXNYNXAOQCCD-UHFFFAOYSA-N dichloro(triphenyl)-$l^{5}-phosphane Chemical compound C=1C=CC=CC=1P(Cl)(C=1C=CC=CC=1)(Cl)C1=CC=CC=C1 ASWXNYNXAOQCCD-UHFFFAOYSA-N 0.000 description 1
- 150000004816 dichlorobenzenes Chemical class 0.000 description 1
- 150000002170 ethers Chemical class 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 229910000042 hydrogen bromide Inorganic materials 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 239000013067 intermediate product Substances 0.000 description 1
- 229910052740 iodine Inorganic materials 0.000 description 1
- 239000011630 iodine Substances 0.000 description 1
- GYNNXHKOJHMOHS-UHFFFAOYSA-N methyl-cycloheptane Natural products CC1CCCCCC1 GYNNXHKOJHMOHS-UHFFFAOYSA-N 0.000 description 1
- 150000007522 mineralic acids Chemical class 0.000 description 1
- 150000002825 nitriles Chemical class 0.000 description 1
- AUONHKJOIZSQGR-UHFFFAOYSA-N oxophosphane Chemical compound P=O AUONHKJOIZSQGR-UHFFFAOYSA-N 0.000 description 1
- QULYNCCPRWKEMF-UHFFFAOYSA-N parachlorobenzotrifluoride Chemical compound FC(F)(F)C1=CC=C(Cl)C=C1 QULYNCCPRWKEMF-UHFFFAOYSA-N 0.000 description 1
- RLOWWWKZYUNIDI-UHFFFAOYSA-N phosphinic chloride Chemical compound ClP=O RLOWWWKZYUNIDI-UHFFFAOYSA-N 0.000 description 1
- 150000003018 phosphorus compounds Chemical class 0.000 description 1
- UHZYTMXLRWXGPK-UHFFFAOYSA-N phosphorus pentachloride Chemical compound ClP(Cl)(Cl)(Cl)Cl UHZYTMXLRWXGPK-UHFFFAOYSA-N 0.000 description 1
- 229920000570 polyether Polymers 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- UMJSCPRVCHMLSP-UHFFFAOYSA-N pyridine Natural products COC1=CC=CN=C1 UMJSCPRVCHMLSP-UHFFFAOYSA-N 0.000 description 1
- 238000007086 side reaction Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000007306 turnover Effects 0.000 description 1
- 238000010626 work up procedure Methods 0.000 description 1
- 239000008096 xylene Substances 0.000 description 1
- 150000003738 xylenes Chemical class 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D239/00—Heterocyclic compounds containing 1,3-diazine or hydrogenated 1,3-diazine rings
- C07D239/02—Heterocyclic compounds containing 1,3-diazine or hydrogenated 1,3-diazine rings not condensed with other rings
- C07D239/24—Heterocyclic compounds containing 1,3-diazine or hydrogenated 1,3-diazine rings not condensed with other rings having three or more double bonds between ring members or between ring members and non-ring members
- C07D239/28—Heterocyclic compounds containing 1,3-diazine or hydrogenated 1,3-diazine rings not condensed with other rings having three or more double bonds between ring members or between ring members and non-ring members with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, directly attached to ring carbon atoms
- C07D239/30—Halogen atoms or nitro radicals
Definitions
- the present invention relates to a process for the preparation of 4,6-dichloropyrimidine from 4-chloro-6-methoxypyrimidine.
- 4,6-dichloropyrimidine is a valuable one
- hydrogen chloride hydrogen bromide and hydrogen iodine.
- Hydrogen chloride is preferred.
- the use of mixtures of hydrogen halides is also possible.
- Hydrogen chloride can e.g. used as such in gaseous form or generated in situ from an excess of acid chloride and a protic compound.
- protic compounds come into question which do not cause any undesirable side reactions in the reaction mixture. Examples include: water, alcohols and organic and inorganic acids.
- Gaseous hydrogen chloride is preferably added or generated in situ. Gaseous hydrogen chloride is particularly preferably used.
- At least 1 mole of acid chloride per mole of 4-chloro-6-methoxypyrimidine is preferably used in the process according to the invention. It is preferred to use 1.1 to 20 mol, particularly preferably 1.5 to 10 mol, of acid chloride per mol of 4-chloro-6-methoxypyrimidine. If the acid chloride is also used as a solvent or as a starting substance for the in-situ generation of hydrogen halide, the preferred minimum amount of the acid chloride is of course correspondingly higher.
- At least 1 mole of hydrogen halide is used per mole of 4-chloro-6-methoxypyrimidine.
- an excess of hydrogen halide is recommended to achieve a high turnover. It is preferred to use 1.1 to 25 moles of hydrogen halide, particularly preferably 2 to 10 moles of hydrogen halide, per mole of 4-chloro-6-methoxypyrimidine.
- the compound is used in amounts such that it produces the above-mentioned amounts of hydrogen halide, i.e. for example, to produce 1 mole of hydrogen chloride, e.g. 0.5 mol of water or 1.0 mol of methanol are used.
- additional amounts of acid chlorides which are equivalent to the amounts of hydrogen chloride to be produced, for example to produce 1 mol of hydrogen chloride, additionally 0.33 mol of phosphorus oxychloride or additionally 0.5 mol of thionyl chloride.
- solvents are suitable which do not negatively influence the reaction to be carried out.
- solvents are aliphatic solvents such as alkanes, cycloalkanes and haloalkanes, aromatic solvents such as benzene, toluene, xylenes, chlorobenzene, chlorotoluenes, dichlorobenzenes, benzotrifluoride and p-chlorobenzotrifluoride, where the aliphatic and aromatic solvents can optionally be further substituted, nitriles such as Acetonitrile and benzonitrile, N-containing solvents such as dimethylformamide, dimethylacetamide, N-methylpyrrolidone and cyclic ureas and ethers and polyethers of all kinds.
- the process of the invention can be used, for example, at temperatures in the. Carry out range 0 to 200 ° C, preferably at 20 to 175 ° C, particularly preferably at 30 to 150 ° C.
- the pressure is not critical. One can, for example, work at 0.1 to 50 bar, preferably at 0.5 to 5 bar. Working at normal pressure is particularly preferred.
- Such catalysts can, for example, in amounts of 0.1 to
- the process according to the invention can be carried out in a wide variety of embodiments, for example batchwise, semi-continuously, continuously or batchwise in batches (for the latter see DE-A 195 31 299).
- 4-chloro-6-methoxypyrimidine can be introduced in solid or molten form, acid chloride and, if appropriate, solvent added, and either hydrogen halide introduced or a protic compound metered in at the desired reaction temperature.
- the reaction mixture can be worked up in a manner known per se, for example
- a discontinuous operation in batches can be selected for the re-chlorination according to c). This can be done, for example, by adding 4-chloro-6-methoxypyrimidine and, for example, phosphorus oxychloride, heating to the reaction temperature, introducing hydrogen chloride gas, after a partial conversion, for example 25 to 60 mol%, the corresponding amount of PCI3 or a slight excess
- reaction mixture contains after the
- the process according to the invention represents a fundamentally new method for the production of 4,6-dichloropyrimidine.
- simple acid chlorides such as phosphorus oxychloride react directly with 4-chloro-6-methoxypyrimidine to give 4,6-dichloropyrimidine when in the presence of Hydrogen halide works.
- the process according to the invention can be carried out technically without difficulty.
- the reaction of acid chlorides, in the simplest case phosphorus oxychloride, with 4-chloro-6-methoxypyrimidine to form 4,6-dichloropyrimidine is only possible by introducing a hydrogen halide, in the simplest case hydrogen chloride, or metering in a protic compound, in the simplest case water ,
- a hydrogen halide in the simplest case hydrogen chloride
- protic compound in the simplest case water
- the method according to the invention also represents a significant advance about the in Res. Discl. The above-mentioned prior art is shown.
- HPLC analysis showed 0.46% by weight of 4-chloro-6-methoxypyrimidine and 20.7% by weight of 4,6-dichloropyrimidine. This corresponds to a yield of 4,6-dichloropyrimidine of 93.8% of theory.
- reaction mixture was then extracted 6 times with 80 parts by weight of methylcyclohexane at 55 ° C.
- the combined extracts were spun in and thus 23.0 parts by weight of colorless crystal needles were obtained, which consisted of 4,6-dichloropyrimidine with an HPLC content of 96.9%.
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Low-Molecular Organic Synthesis Reactions Using Catalysts (AREA)
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/019,092 US6441170B1 (en) | 1999-06-26 | 2000-06-13 | Method of producing 4,6-dichloropyrimidine with acid chlorides |
AU54046/00A AU5404600A (en) | 1999-06-26 | 2000-06-13 | Method for producing 4,6-dichloropyrimidine with acid chlorides |
CA002377089A CA2377089A1 (en) | 1999-06-26 | 2000-06-13 | Method for producing 4,6-dichloropyrimidine with acid chlorides |
JP2001507002A JP2003503393A (ja) | 1999-06-26 | 2000-06-13 | 酸クロライドを用いて4,6−ジクロロピリミジンを製造する方法 |
EP00938784A EP1194412A1 (de) | 1999-06-26 | 2000-06-13 | Verfahren zur herstellung von 4,6-dichlorpyrimidin mit säurechloriden |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19929350A DE19929350A1 (de) | 1999-06-26 | 1999-06-26 | Verfahren zur Herstellung von 4,6-Dichlorpyrimidin mit Säurechloriden |
DE19929350.3 | 1999-06-26 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2001000592A1 true WO2001000592A1 (de) | 2001-01-04 |
Family
ID=7912667
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2000/005400 WO2001000592A1 (de) | 1999-06-26 | 2000-06-13 | Verfahren zur herstellung von 4,6-dichlorpyrimidin mit säurechloriden |
Country Status (7)
Country | Link |
---|---|
US (1) | US6441170B1 (de) |
EP (1) | EP1194412A1 (de) |
JP (1) | JP2003503393A (de) |
AU (1) | AU5404600A (de) |
CA (1) | CA2377089A1 (de) |
DE (1) | DE19929350A1 (de) |
WO (1) | WO2001000592A1 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0371997B1 (de) * | 1987-09-03 | 1993-07-21 | Den Norske Stats Oljeselskap As | Konstruktionsmethode für betonpfeiler für eine plattform oder ähnliche konstruktionen |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103073505B (zh) * | 2013-01-28 | 2015-11-18 | 泰州百力化学股份有限公司 | 4-氯-6-甲氧基嘧啶合成4,6-二氯嘧啶的方法 |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1995029166A1 (en) * | 1994-04-26 | 1995-11-02 | Zeneca Limited | Process for the preparation of 4,6-dichloropyrimidine |
EP0745593A2 (de) * | 1995-06-02 | 1996-12-04 | DSM Chemie Linz GmbH | Verfahren zur Herstellung von reinem 4,6-Dichlorpyrimidin |
EP0761653A1 (de) * | 1995-08-25 | 1997-03-12 | Bayer Ag | Verfahren zur Herstellung von 4,6-Dichlorpyrimidinen |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4429466A1 (de) | 1994-08-19 | 1996-02-22 | Bayer Ag | Verfahren zur Herstellung von Polychlorpyrimidinen |
WO1996023776A1 (en) | 1995-01-30 | 1996-08-08 | Zeneca Limited | Process for preparing 4,6-dichloro-pyrimidine |
GB9709810D0 (en) | 1997-05-14 | 1997-07-09 | Zeneca Ltd | Chemical process |
-
1999
- 1999-06-26 DE DE19929350A patent/DE19929350A1/de not_active Withdrawn
-
2000
- 2000-06-13 JP JP2001507002A patent/JP2003503393A/ja active Pending
- 2000-06-13 EP EP00938784A patent/EP1194412A1/de not_active Withdrawn
- 2000-06-13 WO PCT/EP2000/005400 patent/WO2001000592A1/de not_active Application Discontinuation
- 2000-06-13 CA CA002377089A patent/CA2377089A1/en not_active Abandoned
- 2000-06-13 AU AU54046/00A patent/AU5404600A/en not_active Abandoned
- 2000-06-13 US US10/019,092 patent/US6441170B1/en not_active Expired - Fee Related
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1995029166A1 (en) * | 1994-04-26 | 1995-11-02 | Zeneca Limited | Process for the preparation of 4,6-dichloropyrimidine |
EP0745593A2 (de) * | 1995-06-02 | 1996-12-04 | DSM Chemie Linz GmbH | Verfahren zur Herstellung von reinem 4,6-Dichlorpyrimidin |
EP0761653A1 (de) * | 1995-08-25 | 1997-03-12 | Bayer Ag | Verfahren zur Herstellung von 4,6-Dichlorpyrimidinen |
Non-Patent Citations (2)
Title |
---|
"CHLORINATION OF PYRIMIDINES", RESEARCH DISCLOSURE,GB,INDUSTRIAL OPPORTUNITIES LTD. HAVANT, no. 391, 1 November 1996 (1996-11-01), pages 690 - 691, XP000680903, ISSN: 0374-4353 * |
SHIAO MIN-JEN: "A convenient synthesis of halogenated 2-chloropyridines by transfor- mation of halogenated 2-methoxypyridines under Vilsmeier-Haack conditions", SYNTHETIC COMMUNICATIONS., vol. 20, no. 19, 1990, MARCEL DEKKER, INC., BASEL., CH, pages 2971 - 2977, XP000960608, ISSN: 0039-7911 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0371997B1 (de) * | 1987-09-03 | 1993-07-21 | Den Norske Stats Oljeselskap As | Konstruktionsmethode für betonpfeiler für eine plattform oder ähnliche konstruktionen |
Also Published As
Publication number | Publication date |
---|---|
JP2003503393A (ja) | 2003-01-28 |
US6441170B1 (en) | 2002-08-27 |
EP1194412A1 (de) | 2002-04-10 |
DE19929350A1 (de) | 2000-12-28 |
AU5404600A (en) | 2001-01-31 |
CA2377089A1 (en) | 2001-01-04 |
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