Verfahren zur Herstellung von 2,2-disubstituierten 3-Acyl-5a-amino-thiazolidin-4-carbonsäuren oder deren funktionellen Derivaten

摘要

Compounds of formula:- (VIIIa) Ac = acyl; X = disubst. C atom of the thiazolidine ring; R' = free or funct. converted COOH. Sub claims indicate that X = where R2, R3 singly = aliphatic, aromatic, araliphatic group or R2 + R3 = bivalent aliphatic hydrocarbon group, phthaloyl, oxo or thiono; R' = free or esterified COOH, CONH2, CN, CON3, CONHNH2, azocarbonyl. Inters for 7-ACA and cephalosporins.