PROCESS FOR PREPARING CEPHALOSPORIN DERIVATIVES

摘要

Cephalosporin derivs. of fromula (I) are prepd. by reacting a cpd. of formula (II) with a cpd. of formula (III). In the formulas, X is halogen; A is carbonic acid -protecting gp.; R1 is amino-protecting gp.; R is C1-6 alkyl; asterisk indicates (R), (S) or (RS)-form; n is 0 or 1; n' is 0-3; n2 is 0-3. (I) are useful as antibiotics having a high bactericidal activity.