3-acyloxymethyl-cephem compounds

Details 3-acyloxymethyl-cephem compounds 3-acyloxymethyl-cephem compounds

C - Chemistry, Metallurgy

07

D

260/103, 260/108

C07D 501/16 (2006.01)

Patent

CA 1103236

ABSTRACT An improved process for preparing cephem compounds of the formula: Image [I] , wherein R1 represents hydrogen or an acyl group and R2 stands for a substi- tuted or unsubstituted pyridinium or a residue of a nitrogen containing hetero- cyclic thiol, or a salt thereof, which comprises reacting a compound of the formula; Image [II] , wherein W represents acetonyl or a group represented by -X-COOH or -X-OH (in which X is a divalent carbon chain which is able to form a five- or six- membered ring with Image or Image ,which may include a double bond or such an atom or atoms as oxygen, nitrogen or sulfur therein, and on which carbon chain suitable substituent or substituents may be attached) or a salt thereof with a substituted or unsubstituted pyridine or a nitrogen containing heterocyclic thiol. The procedure, using the above defined compound of formula(II) as starting material results in better yields and/or shorter reaction times.

352064

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