7.alpha.Methoxycephalosporin derivatives

Abstract

A 7.alpha.-methoxycephalosporin derivative represented by the formula (I): ##STR1## wherein R.sub.1 represents a heterocyclic ring or an --S-- heterocyclic ring; R.sub.2 represents a hydrogen atom, a carboxy group or a --COOR.sub.5 group wherein R.sub.5 represents a lower alkyl group, a dialkylamino-lower alkyl group or a ##STR2## group wherein R.sub.6 represents a lower alkyl group, a lower acyl group or a lower alkoxycarbonyl group and Y represents a hydrogen atom or a lower alkyl group; R.sub.3 represents a hydrogen atom, a carbamoyl group or a lower acyl group; R.sub.4 represents a hydrogen atom, a lower alkyl group, a dialkylamino-lower alkyl group or a ##STR3## group wherein R.sub.6 and Y are defined as above; A and B, which may be the same or different, each represents a straight chain or branched chain alkylene group having 1 to 5 carbon atoms; and x represents 0 or 1; or a pharmaceutically acceptable salt thereof and a process for producing the same.

Dependencies are inferred from the claim text.