Classifications

• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
  • C07C319/00—Preparation of thiols, sulfides, hydropolysulfides or polysulfides
  • C07C319/26—Separation; Purification; Stabilisation; Use of additives
  • C07C319/28—Separation; Purification
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07B—GENERAL METHODS OF ORGANIC CHEMISTRY; APPARATUS THEREFOR
  • C07B57/00—Separation of optically-active compounds

Definitions

• the invention relates to an advanced process for the production of enantiomerically pure biaryl ketocarboxylic acids.
• Biarylketocarboxylic acids in particular substituted biaryl-4-ketocarboxylic acids, are inhibitors for enzymes of the class of the matrix
• Metallo-proteinases By inhibiting the above enzymes e.g. Osteoarthritis, rheumatoid arthritis and metastases are combated.
• the biaryl ketocarboxylic acids are obtained in the synthesis as racemates, and these are described in WO 96/15096.
• the racemates become pharmacologically active
• Enantiomer 50% of which is contained in the racemates, is separated off. It is therefore very desirable to separate the active enantiomer, of which only 50% can theoretically be formed anyway, in the highest possible yield.
• optically active auxiliaries are used which form a diastereomeric salt with the enantiomer to be separated.
• the diastereomeric salt should be less soluble than the other reactants so that it can be easily separated.
• the diastereomeric salt should preferably be obtained in high enantiomeric purity during production, so that as few additional purification steps as possible are subsequently required, as a result of which a high yield is achieved.
• the optically active auxiliary should preferably be in chemically pure form with a defined content, be easily accessible and inexpensive. Preferably only 50% of the optically active auxiliary should be used, so that the diastereomeric salt is formed only with the desired enantiomer.
• Cinchonin is a non-uniform natural product that contains 5 to 30% dihydrocinchonine. Cinchonin can only be obtained in limited quantities and is also very expensive.
• racemate can be subjected to enantiomer separation in situ, i.e. the last chemical step and the resolution of racemates are coupled together as shown in the following reaction scheme.
• Biphenylacrylic acid (1) is reacted with thiophenol in the presence of tetrabutylammonium fluoride to give 4-CMorbiphenyl-4-oxo-2-phenyltomethylene-butanecarboxylic acid (2) and this is isolated with S-phenylethylamine (S-PEA) to give the corresponding S-phenylethylammonium salt ( 3).
• S-PEA S-phenylethylamine
• 3_ can be recrystallized if necessary.
• the desired enantiomer of 4-chlorobiphenyl-4-oxo-2-phenylthiomethylene-butanecarboxylic acid (4) is then released from 3_.
• Solvent (acetone) can be carried out.
• the concentration of the reaction solution can be 2 to 20%, preferably 12 to 16%.
• the concentration of recrystallization can be 2% to saturation; however, much less solvent can be used.
• the ratio of racemate to auxiliary base S-PEA can be 0.45 to 1.00, preferably 0.5 to 0.6.
• ethers such as diethyl ether, THF, dioxane, ethylene glycol dimethyl ether, ethylene glycol monomethyl ether, diethylene glycol dimethyl ether; Ketones such as acetone, methyl ethyl ketone, diethyl ketone, methyl isobutyl ketone; Esters, such as, for example, methyl acetate, ethyl acetate, butyl acetate. THF, ethyl acetate and acetone are preferred, acetone is very particularly preferred.
• the above solvents can also be used as mixtures.
• the same solvent can be used for the addition of thiophenol, for the separation of enantiomers, for the recrystallization of the diastereomeric salts and for the release of the acid from the salt, or different solvents can be used. 1 to 30% water can be added to the water-miscible solvents.
• the moist precipitate is heated to reflux in 4.6 l of acetone (depending on the residual moisture, more acetone may be necessary), cooled to 46 ° C. and inoculated.
• the mixture is stirred for 2 hours (without heating), cooled to 5 ° C. and stirred for a further hour.
• the crystals are filtered off and washed with 250 ml of acetone.
• the moist crystals are semi-concentrated in a mixture of 200 ml of acetone and 55 ml.
• Hydrochloric acid dissolved the solution is brought to pH 1 to 2 with hydrochloric acid, filtered and metered in within 30 minutes to 500 ml of 0.5 N hydrochloric acid cooled to 0 ° to -5 ° C., in which there are seed crystals. It is stirred for a further 15 minutes at this temperature, suction filtered, washed with water and dried.
• Hydrochloric acid dissolved the solution is brought to pH 1 to 2 with hydrochloric acid, filtered and metered in over 30 minutes to 500 ml of 0.5 N hydrochloric acid cooled to 0 to -5 ° C., in which there are seed crystals. The mixture is stirred at this temperature for a further 15 minutes, suction filtered, washed with water and dried. 135 g (40.2% of theory) with an enantiomeric purity of 97 to 99% are obtained.
• Washed acetone The moist precipitate is refluxed in 2.0 l of acetone for 30 min. The mixture is cooled to 5 ° C. and kept at this temperature for 1 hour. The crystals are filtered off and washed with 250 ml of acetone. The moist crystals are semi-concentrated in a mixture of 200 ml of acetone and 55 ml. Hydrochloric acid dissolved, the solution is brought to pH 1 to 2 with hydrochloric acid, filtered and metered in within 30 min to 500 ml of 0.5 N hydrochloric acid cooled to 0 to -5 ° C., in which there are seed crystals. The mixture is stirred at this temperature for a further 15 min, suction filtered, washed with water and dried. 141 g (42.0% of theory) with an enantiomeric unit of over 99% are obtained.

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• Chemical & Material Sciences (AREA)
• Organic Chemistry (AREA)
• Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
• Acyclic And Carbocyclic Compounds In Medicinal Compositions (AREA)
• Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)

Applications Claiming Priority (3)

Publications (1)

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• 1997
  • 1997-04-25 DE DE19717429A patent/DE19717429A1/de not_active Withdrawn
• 1998
  • 1998-04-02 TW TW087104934A patent/TW382622B/zh not_active IP Right Cessation
  • 1998-04-14 TR TR1999/02451T patent/TR199902451T2/xx unknown
  • 1998-04-14 KR KR1019997009828A patent/KR20010020236A/ko not_active Application Discontinuation
  • 1998-04-14 JP JP54653698A patent/JP2001524102A/ja active Pending
  • 1998-04-14 AU AU75251/98A patent/AU730250B2/en not_active Ceased
  • 1998-04-14 WO PCT/EP1998/002176 patent/WO1998049124A1/de not_active Application Discontinuation
  • 1998-04-14 CN CN98804521A patent/CN1253539A/zh active Pending
  • 1998-04-14 CA CA002288107A patent/CA2288107A1/en not_active Abandoned
  • 1998-04-14 BR BR9809418-1A patent/BR9809418A/pt not_active Application Discontinuation
  • 1998-04-14 IL IL13206598A patent/IL132065A0/xx unknown
  • 1998-04-14 SK SK1459-99A patent/SK145999A3/sk unknown
  • 1998-04-14 HU HU0003633A patent/HUP0003633A3/hu unknown
  • 1998-04-14 EP EP98922707A patent/EP0977717A1/de not_active Withdrawn
  • 1998-04-14 PL PL98336323A patent/PL336323A1/xx unknown
  • 1998-04-14 ID IDW991186A patent/ID22701A/id unknown
  • 1998-04-14 US US09/381,597 patent/US6172259B1/en not_active Expired - Fee Related
  • 1998-04-15 AR ARP980101737A patent/AR012440A1/es unknown
  • 1998-04-24 ZA ZA983473A patent/ZA983473B/xx unknown
  • 1998-04-24 CO CO98022781A patent/CO4940428A1/es unknown
• 1999
  • 1999-10-04 BG BG103776A patent/BG103776A/xx unknown
  • 1999-10-13 NO NO994977A patent/NO994977L/no not_active Application Discontinuation

Non-Patent Citations (1)

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