摘要:
Crystalline 2-(aminothiazol-4-yl)-2-(tert.butoxycarbonylmethoxyimino)acetic acid-S-mercapto-benzo-thiazolylester in form of an N,N-dimethylacetamide solvate; a crystalline salt of a 7-[2-(aminothiazol-4-yl)-2-(carboxymethoxyimino)acetamido]-3-vinyl-3-cephem-4-carboxylic acid with an amine of formula N(R1)(R2)(R3), wherein R1, R2, and R3 have various meanings, a crystalline sulphuric acid addition salt of a 7-[2-(2-aminothiazol-4-yl)-2-carboxymethoxyimino)acetamido]-3-vinyl-3-cephem-4-carboxylic acid; and the use of these salts in the production of cefixime, e.g. in form of a trihydrate.
摘要:
The invention relates to a new process for the depletion of 7-amino-3-[(E)-1-propen-1-y1]-3-cephem-4-carboxylic acid in mixtures of 7-amino-3-[(Z)-1-propen-1-y1]-3-cephem-4-carboxylic acid and 7-amino-3-[(E)-1-propen-1-y1]-3-cephem-4-carboxylic acid, by means of the crystalline hydrochloride or a metal or amine salt of 7-amino-3-[(Z/E)-1-propen-1-y1]-3-cephem-4-carboxylic acid or by adsorption chromatography.
摘要:
The novel intermediate compound crystalline 7-[2-(2-fomylaminothiazol-4-yl)-2 -(Z)-(methoxyimino)acetamido]-3-methoxymethyl-3-cephem-4-carboxylic acid-1 -(isopropoxy/crystallization of cefpodoxime proxetil. The crystallization process comprises dissolving or suspending the intermediate in the presence of a nitrile or a ketone or mixtures thereof; at a ratio of 1 gm of the intermediate to 2-15 ml nitrile; or at a ratio of 1 gm of the intermediate to 3-15 ml ketone; in the presence of 5-80 ml water; and thereafter isolating the intermediate in crystalline form and converting the intermediate by splitting off the formyl group from the amino group attached to the thiazolyl group, to obtain the desired product cefpodoxime proxetil, in the form of a diastereoisomeric mixture in a ratio of B/(A+B) of 0.5 to 0.6.
摘要:
A process for the adjustment of the diastereoisomeric ratio of a mixture of diastereoisomers of a compound of formula (I) the diastereoisomers being with respect with the carbon atom marked with a star in formula (I), comprising treating a compound of formula (I) with alcohol and water and use of that process in the production of cefpodoxime proxetil in a desired diastereoisomeric ratio, e.g. 0.5 to 0.6.
摘要:
L'invention se rapporte à un nouveau procédé destiné à l'épuisement de l'acide 7-amino-3-[(E)-1-propen-1-yl]-3-céphem-4-carboxylique dans des mélanges d'acide 7-amino-3-[(Z)-1-propen-1-yl]-3-céphem-1-carboxylique et d'acide 7-amino-3-[(E)-1-propen-1-yl]-3-céphem-4-carboxylique, par l'intermédiaire de l'hydrochlorure cristallin ou d'un sel amine ou métallique d'acide 7-amino-3-[(Z/E)-1-propen-1-yl]-3-céphem-4-carboxylique, ou par chromatographie par absorption.
摘要:
Crystalline 2-(aminothiazol-4-yl)-2-(tert.butoxycarbonylmethoxyimino)acetic acid-S-mercapto-benzo-thiazolylester in form of an N,N-dimethylacetamide solvate; a crystalline salt of a 7-[2-(aminothiazol-4-yl)-2-(carboxymethoxyimino)acetamido]-3-vinyl-3-cephem-4-carboxylic acid with an amine of formula N(R1)(R2)(R3), wherein R1, R2, and R3 have various meanings, a crystalline sulphuric acid addition salt of a 7-[2-(2-aminothiazol-4-yl)-2-carboxymethoxyimino)acetamido]-3-vinyl-3-cephem-4-carboxylic acid; and the use of these salts in the production of cefixime, e.g. in form of a trihydrate.