| 摘要 |
New 3-vinylcephalosporins of the general formula (I), <IMAGE> (I) in which n=0 or 1, R1 is a radical of the general formula (II), <IMAGE> (II) in which R4 is hydrogen or a protective radical and R5 represents a radical of the general formula (IIa) <IMAGE> (IIa) in which Ra5 and Rb5 are hydrogen or alkyl or together form an alkylene radical and Rc5 is hydrogen or a protective radical, R2 is hydrogen, a protective radical or a radical which can easily be removed by an enzymatic method, and R3 is a halogen atom or a radical R'3SO2O- or R''3CO-O-, in which radicals R'3 and R''3 are substituted or unsubstituted alkyl or phenyl radicals, or alternatively R1 is a hydrogen atom or a radical of the general formula (II) in which R4 is defined as above and R5 is hydrogen, alkyl, vinyl, cyanomethyl or a protective radical, and R2 is defined as above, or R1 is hydrogen or a variously substituted acyl radical and R2 is hydrogen or a protective radical, and R3 is a halogen atom. These new products are useful as intermediates for the preparation of antibiotic cephalosporins.
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