ANALOGOUS COMPOUNDS OF CEPHALOSPORINS, PROCESSES FOR THEIR PREPARATION, AND PHARMACEUTICAL COMPOSITION CONTAINING THEM

摘要

Analogous compounds of cephalosporins of the formula …… wherein R<1> is amino or a substituted amino,… R<2> is hydrogen or lower alkoxy, or… R<1> and R<2> are combined together to form a group of the formula: …… wherein R<6> and R<7> are each hydrogen or lower alkyl, and A is a group of the formula: …… wherein X is -S- or ……-@-,… R<3> is carboxy or a protected carboxy group and R<4> is hydrogon, hydroxy or acyl, and pharmaceutically acceptable salt thereof and process for their preparation, and also a pharmaceutical composition comprising, as an effective ingredient, the above compound in association with a pharmaceutically acceptable, substantially non-toxic carrier or excipient. The invention also relates to the starting compounds