| abstract |
Novel 3-vinyl-cephalosporin derivates of the general formula <IMAGE> (I) in the bicyclooct-2-ene or bicyclooct-3-ene form, in which R1 is a protective radical or is a radical of the general formula <IMAGE> (II) in which R5 is hydrogen, alkyl, vinyl or cyanomethyl, or a protective radical, and R6 is hydrogen or a protective radical, and R2 is a protective radical or an enzymatically removable radical, or R1 is an acyl radical, which may carry various substituents, and R2 represents a protective radical, and R3 and R4, which are identical or different, represent alkyl (optionally substituted by hydroxyl, alkoxy, amino, alkylamino or dialkylamino) or phenyl, or form, together with the nitrogen atom, a saturated 5-membered or 6-membered heterocyclic ring optionally containing another hetero-atom, their E- and Z-forms and their mixtures, are useful as intermediates for the preparation of 3-thiovinyl cephalosporins useful as antibacterial agents. |