WO1993015038A1 - Preparation of optically active aliphatic carboxylic acids - Google Patents
Preparation of optically active aliphatic carboxylic acids Download PDFInfo
- Publication number
- WO1993015038A1 WO1993015038A1 PCT/US1992/010860 US9210860W WO9315038A1 WO 1993015038 A1 WO1993015038 A1 WO 1993015038A1 US 9210860 W US9210860 W US 9210860W WO 9315038 A1 WO9315038 A1 WO 9315038A1
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- WO
- WIPO (PCT)
- Prior art keywords
- salt
- enantiomer
- solution
- linear
- mixture
- Prior art date
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C51/00—Preparation of carboxylic acids or their salts, halides or anhydrides
- C07C51/42—Separation; Purification; Stabilisation; Use of additives
- C07C51/487—Separation; Purification; Stabilisation; Use of additives by treatment giving rise to chemical modification
Definitions
- This invention relates to an improvement in a process for the preparation of optically active carboxylic acids and the esters thereof. More particularly this invention 5 relates to an improved process for the preparation of aliphatic carboxylic acids and the esters thereof by adding to a mixture of the diastereomeric salts of such materials a solution of the aliphatic carboxylic acid or ester thereof for a time sufficient to cause the crystalline material to increase in the concentration of one of the salts and then separating the diastereomeric salt.
- U. S. Patent No. 5,015,764 discloses and claims a process for increasing the amount of the desired enantiomer obtained from a racemic mixture of C* to C 6 linear or branched aliphatic carboxylic acid or ester thereof.
- the process comprises: (i)
- step (ii) forming a mixture comprising the racemic mixture of the to C 6 linear or branched aliphatic carboxylic acid or ester thereof and an organic or inorganic solvent; (ii) treating said salt solution with a chiral organic nitrogenous base; (iii) precipitating from the reaction solution produced in the treatment of step (ii) a crystalline material that is comprised of greater than 50% of one diastereomeric salt; and (iv) separating said diastereomeric salt.
- reaction steps (i), (ii) and (iii) are carried out as disclosed.
- a two-phase mixture is produced that is essentially the solid diastereomeric salt and the remaining reaction liquid.
- the solid is dispersed in near emulsion form throughout the liquid. It is typically separated by filtration leaving the mother liquor filtrate and solid filtered residue.
- the residue requires numerous recrystallizations before a product of satisfactory purity is obtained. This process of successive crystallization significantly reduces the amount of final product recovery of satisfactory purity.
- the conventional separation processes are inconvenient and time consuming, disadvantageously producing multiple process streams and reducing yield of the product significantly.
- the crystalline material precipitated from the treatment step ii) is a mixture of enantiomeric salts of the carboxylic acids (or esters thereof), the mixture being of greater than 50% concentration in one of the salts.
- the precipitated mixture has a high concentration of the less soluble enantiomer in the solvent used to form the salt solution of step i). The more soluble enantiomer remains in solution.
- the slurry formed from step iii) is an equilibrium mixture of the enantiomeric salts.
- ⁇ rt invention is a purification or optical enrichment process with significantly higher 5 recoveries in yield.
- the solvent used for dissolving the racemic mixture of the aliphatic carboxylic acid or ester thereof is a C 5 to C 12 linear or branched hydrocarbon optionally substituted with one or more halo groups or it is an aromatic hydrocarbon optionally substituted with one or more to C 6 linear
- the solvent is selected from the group consisting essentially of hexanes, heptanes, octane, benzene, toluene, xylenes, methanol, ethanol, propanols, butanols, pentan ⁇ ls, hexanols, linear or branched amides, diamides and substituted amides or mixtures thereof.
- R- is hydrogen or C- to C 6 linear or branched alkyl or substituted linear or branched alkyl;
- R 2 , R 3 and R 4 are independently the same or different and are hydrogen or C ⁇ to C 6 linear or branched alkyl, e.g., methyl or ethyl; aralkyl, e.g., benzyl; cycloalkyl, e.g., cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl; alkyl substituted cycloalkyl, e.g.,
- C 6 to C 10 aryl e.g., phenyl unsubstituted or substituted with, for example, methyl, dimethyl, butyl especially isobutyl or phenyl substituted with C- to C 4 alkylthio, to C 4 alkoxy, cyano or halo, e.g., fluoro or chloro; to C 6 linear or branched alkoxy, e.g., phenoxy or phenoxy substituted with, for example, methyl dimethyl, butyl or isobutyl or phenoxy substituted with C x to C 4 alkylthio, C* to C 4
- C ⁇ to C 6 alkylthio e.g., methylthio; to C 8 cycloalkyl-thio; C 6 to C 10 arylthio; C 6 to C 10 arylcarbonyl, e.g., benzoyl; C 4 to C 8 cycloalkenyl, e.g., cyclohexenyl; trifluoromethyl; halo, e.g., fluoro or chloro; C 4 to C 5 heteroaryl, e.g., furyl, pyrrolyl, thienyl; or C 10 to C 14 aryl, e.g., naphthyl or naphthyl substituted with C ⁇ to C 4 alkyl, e.g., methyl; C- to C 4 alkoxy, e.g., ethoxy, halo; or biphenyl unsubstituted or substituted with methyl or
- Preferred compounds of formula I are those of the formula
- R l5 R 2 and R 3 are as previously defined and R 5 and R 6 are C, to C 4 linear or branched alkyl, to C 4 linear or branched alkoxy or halo.
- the improved process is particularly applicable to 2-(4-isobutylphenyl)propionic acid and especially in obtaining a preponderance of the S(-) isomer.
- the process is carried out by using a racemic mixture [a mixture of both the ( + ) and (-) or dextro and levo rotorary forms] or a mixture containing a preponderance of one of the enantiomers of these carboxylic acids.
- a racemic mixture a mixture of both the ( + ) and (-) or dextro and levo rotorary forms
- a mixture containing a preponderance of one of the enantiomers of these carboxylic acids is preferred. Because the separation of isomers gives rise to a soluble product largely containing one enantiomer and an insoluble product largely containing the other enantiomer, ⁇ a high purity salt is obtained that requires a minimum number of recrystallizations (usually not more than one) to give a product with exceptional high optical purity at significantly higher yields.
- the purified enantiomeric salt obtained from the process of the present invention may be further treated to produce the free aliphatic carboxylic acid thereof by using any conventional means.
- hydrolysis of the salt with a dilute mineral acid and extraction with a suitable organic solvent produces the purified aliphatic carboxylic acid.
- Further extraction and recrystallization with a suitable solvent can increase the purity to even greater extent.
- the first step in the reaction sequence for the separation of the racemic mixtures used in the present invention is to form a mixture of the aliphatic carboxylic acid with a solvent.
- the solvent employed to form the mixture is preferably a liquid and inert.
- such solvents include the aliphatic hydrocarbon solvents, i.e., C 4 to C 14 hydrocarbons, C ⁇ to C 6 alcohols, nitriles, amides, and halides. Particularly preferred are hexanes, heptanes, octanes and water as such solvent.
- the chiral organic nitrogenous base is next added. It forms a more stable salt with the isomers of the aliphatic carboxylic acid. Further, one of the diastereomeric salts formed from the chiral organic nitrogenous base is more soluble in the reaction solution (the solution formed when the chiral base is added to the salt solution), the other, of course, precipitates. The solid crystalline precipitate is readily separated from the solution by conventional techniques, i.e., centrifugation, filtration and the like. It is this material that is used, as the starting material for the purification process of the present invention. It should be noted that the process of the present invention is particularly adapted to the economical conversion of racemic mixtures to the diastereomeric S- or R- component.
- the method of the present invention essentially provides a solid precipitate enriched in the S-enantiomer and a liquid filtrate enriched in the R- enantiomer.
- Liberation of the desired S-enantiomer from the precipitated salt is readily accomplished by acidification of the salt with, for example, dilute mineral acid or any other inorganic or organic acid conventionally known to hydrolyze salts of this nature.
- This procedure leaves the R-enriched filtrate as a by-product.
- the desired product is the R-isomer
- the filtrate can be treated in a conventional manner to recover the R-isomer.
- the filtrate as such, can be racemized via conventional methods and recycled. This mixture can then be reused in the process of the present invention, using the chiral organic base recovered from the above conversion step.
- the process of the present invention lends itself readily to a recycling-type of procedure.
- Example 2 Using part of the procedure of Example 1, the salt of ibuprofen and S- methylbenzyl amine (161.5 grams, 75% S-enantiomer) was prepared. This was dissolved in 475 mL of methanol at 75 ° C. Upon cooling to -10 ° C, the precipitated solids were filtered, washed with cold methanol, dried and analyzed. (111.4 grams, 90% S- enantiomer). These solids represent a 69% yield based on S-methylbenzyl amine.
- Example 2 Using part of the procedure outlined in Example 1, 161.5 grams of ibuprofen and S-methylbenzyl amine salt were prepared (75% S-enantiomer). These solids were slurried in 1,700 mL of hexane and to this mixture were added 102 grams of racemic ibuprofen. The contents were heated to 68 ° C and agitated for 4 hours and then cooled to 25 ° C and filtered. The solids were washed with hexane, dried (155 grams) and analyzed (91% S-enantiomer). The yield was 96%.
- EXAMPLE 5 Using part of the procedure outlined in Example 4, 161.5 grams of ibuprofen and S-methylbenzyl amine salt were prepared (75% S-enantiomer). These solids were slurried in 1,700 mL of hexane and to this mixture were added 102 grams 75% S- enantiomeric ibuprofen. The contents were heated to 68 ° C and agitated for 4 hours and then cooled to 25 ° C and filtered. The solids were washed with hexane, dried (155 grams) and analyzed (95% S-enantiomer). The yield was 96%.
- Example 4 The procedure of Example 4 was repeated with the following variations: 300 mL of methanol were used as solvent and the final slurry was cooled to -10 ° C. The filtered solids were dried (139.5 grams) and analyzed (92% S-enantiomer). The yield was 86%.
- Example 7 The procedure of Example 4 was repeated with the following variations: 50 mL of triethylamine and 450 mL of water were used as solvent and the final slurry was cooled to 20 " C. The filtered solids were dried (154 grams) and analyzed (91% S-enantiomer). The yield was 95.3%.
- the filtrate from Example 4 was concentrated to 1,000 mL. 100 mL of 1 N HCl were used to wash the concentrate. The concentrate was washed twice with 50 mL portions of water. The hexane layer was evaporated to dryness to recover 105.5 grams of ibuprofen (37% S-enantiomer).
- the filtrate from Example 4 was concentrated to 1,000 mL to which 100 mL of triethylamine were added. The whole was heated to 140° C under pressure for 4 hours. Upon cooling, the reaction mass was washed with 1,000 mL of 1 N HCl followed by two 100 mL portions of water. The hexane layer was evaporated to dryness and
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE69219363T DE69219363T2 (en) | 1992-01-24 | 1992-12-16 | METHOD FOR PRODUCING OPTICALLY ACTIVE ALIPHATIC CARBONIC ACIDS |
JP5513205A JPH07507539A (en) | 1992-01-24 | 1992-12-16 | Preparation of optically active aliphatic carboxylic acids |
EP93901273A EP0623107B1 (en) | 1992-01-24 | 1992-12-16 | Preparation of optically active aliphatic carboxylic acids |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US825,055 | 1992-01-24 | ||
US07/825,055 US5220053A (en) | 1992-01-24 | 1992-01-24 | Preparation of optically active aliphatic carboxylic acids |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1993015038A1 true WO1993015038A1 (en) | 1993-08-05 |
Family
ID=25243009
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US1992/010860 WO1993015038A1 (en) | 1992-01-24 | 1992-12-16 | Preparation of optically active aliphatic carboxylic acids |
Country Status (6)
Country | Link |
---|---|
US (1) | US5220053A (en) |
EP (1) | EP0623107B1 (en) |
JP (1) | JPH07507539A (en) |
CA (1) | CA2128519A1 (en) |
DE (1) | DE69219363T2 (en) |
WO (1) | WO1993015038A1 (en) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE69231359T2 (en) | 1991-05-13 | 2001-02-08 | The Boots Co., Plc | PHARMACEUTICAL COMPOSITION CONTAINING IBUPROFEN SALT |
JP3010816B2 (en) * | 1991-08-22 | 2000-02-21 | ダイセル化学工業株式会社 | Method for recovering optical isomer and solvent in optical resolution, method for recycling solvent, and method for reusing optical isomer |
US5874614A (en) * | 1997-12-11 | 1999-02-23 | Albemarle Corporation | Sodium (S)-2-(6-methoxy-2-naphthyl)propionate monohydrate |
US5859292A (en) * | 1997-12-11 | 1999-01-12 | Albemarle Corporation | Preparation of high purity sodium (S)-2(6-methoxy-2-naphthyl)propionate |
AT410545B (en) * | 2001-11-07 | 2003-05-26 | Dsm Fine Chem Austria Gmbh | METHOD FOR PRODUCING CHIRAL ALPHA HYDROXYCARBOXYLIC ACIDS |
ATE319668T1 (en) * | 2003-04-09 | 2006-03-15 | Servier Lab | METHOD FOR SYNTHESIS OF (2S)-INDOLIN-2-CARBOXIC ACID, AND USE IN THE SYNTHESIS OF PERINDOPRIL |
US7223351B2 (en) | 2003-04-17 | 2007-05-29 | Great Lakes Chemical Corporation | Fire extinguishing mixtures, methods and systems |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0095901A1 (en) * | 1982-05-27 | 1983-12-07 | Syntex Pharmaceuticals International Limited | Process for the preparation of (d) 2-(d-methoxy-2-naphthyl) propionic acid and pharmaceutically acceptable salts thereof and new intermediates therefor |
US5015764A (en) * | 1990-06-18 | 1991-05-14 | Ethyl Corporation | Preparation of optically active aliphatic carboxylic acids |
WO1992018455A1 (en) * | 1991-04-15 | 1992-10-29 | Ethyl Corporation | Resolution of ketoprofen |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
IT1203605B (en) * | 1985-04-18 | 1989-02-15 | Alfa Chem Ital | PROCESS FOR THE OPTICAL RESOLUTION OF MIXTURES OF ACIDS AND NAFTYLPROPIONICS |
JPH0684332B2 (en) * | 1985-06-20 | 1994-10-26 | 住友化学工業株式会社 | Method for optical resolution of a-isopropyl-p-chlorophenylacetic acid |
DE3814887C1 (en) * | 1988-05-02 | 1989-09-21 | Medice Chem.-Pharm. Fabrik Puetter Gmbh & Co Kg, 5860 Iserlohn, De |
-
1992
- 1992-01-24 US US07/825,055 patent/US5220053A/en not_active Expired - Fee Related
- 1992-12-16 CA CA002128519A patent/CA2128519A1/en not_active Abandoned
- 1992-12-16 DE DE69219363T patent/DE69219363T2/en not_active Expired - Fee Related
- 1992-12-16 WO PCT/US1992/010860 patent/WO1993015038A1/en active IP Right Grant
- 1992-12-16 JP JP5513205A patent/JPH07507539A/en active Pending
- 1992-12-16 EP EP93901273A patent/EP0623107B1/en not_active Expired - Lifetime
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0095901A1 (en) * | 1982-05-27 | 1983-12-07 | Syntex Pharmaceuticals International Limited | Process for the preparation of (d) 2-(d-methoxy-2-naphthyl) propionic acid and pharmaceutically acceptable salts thereof and new intermediates therefor |
US5015764A (en) * | 1990-06-18 | 1991-05-14 | Ethyl Corporation | Preparation of optically active aliphatic carboxylic acids |
WO1992018455A1 (en) * | 1991-04-15 | 1992-10-29 | Ethyl Corporation | Resolution of ketoprofen |
Also Published As
Publication number | Publication date |
---|---|
JPH07507539A (en) | 1995-08-24 |
US5220053A (en) | 1993-06-15 |
DE69219363D1 (en) | 1997-05-28 |
EP0623107B1 (en) | 1997-04-23 |
EP0623107A1 (en) | 1994-11-09 |
DE69219363T2 (en) | 1997-08-07 |
CA2128519A1 (en) | 1993-08-05 |
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