Diastereomers of 1-(isopropoxycarbonyloxy) ethyl...

Details Diastereomers of 1-(isopropoxycarbonyloxy) ethyl... Diastereomers of 1-(isopropoxycarbonyloxy) ethyl...

C - Chemistry, Metallurgy

07

D

C07D 501/34 (2006.01) A61K 31/545 (2006.01) C07D 501/00 (2006.01)

Patent

CA 2077562

Diastereomers of 1-(isopropoxycarbonyloxy)ethyl 3-cephem- 4-carboxylate and processes for their preparation Enterally absorbable diastereomers of 1-(isopropoxy- carbonyloxy)ethyl (6R,7R)-7-[2-(2-aminothiazol-4-yl)- 2-(Z)-(methoxyimino)acetamido]-3-(methoxymethyl)- 3-cephem-4-carboxylate of the formula I Image and their physiologically acceptable salts and also diastereomerically pure salts of the compounds of the formula II Image where HX is a mono- or polybasic acid and where X is an inorganic or organic physiologically acceptable anion, and a process for the preparation of these compounds of the formula I or II, which comprises first precipitating the more sparingly soluble diastereomer of the formula IV in the mixing together of 1 equivalent of a solution of the diastereomer mixture of the formula III with 0.2-2 equivalents of a solution of the acid component HY and separating it off by filtration, then precipitating the more readily soluble diastereomer of the formula IV from the filtration solution, it being possible for the acid component HY to be identical or different in the consecutive partial steps and any desired sequence of addition of different acid components HY being possible, and optionally further purifying the obtained salts by crystallization, are described.

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