ANALOGIFREMGANGSMAADE TIL FREMSTILLING AF CEPHALOSPORINER

Acyl derivatives of the general formula X-S-Y in which X denotes a 3-acetoxymethylcephalosporinyl radical decreased by the acetoxy group and -S-Y denotes the thio group standing instead of the acetoxy group, in which Y represents a 6-membered, optionally substituted, heterocyclic radical having 1 to 3 nitrogen atoms, which is not heteroaromatic and cannot be enolised to give a heteroaromatic radical, where at least one of these nitrogen atoms is substituted and at least one of these nitrogen atoms forms an amide group with an adjacent carbonyl group, or salts of these compounds or hydrates of these salts are antibiotically active products. These products can be prepared by reacting a cephalosporin derivative which carries an easily removable group on the 3-methyl group instead of the acetoxy substituent and whose carboxyl group in position 4 is present in protected form, with a mercapto compound Y-SH and removing the protective group.