NEW DERIVATIVES OF CEPHALOSPORINS,THEIR PROCESS OF PREPARATION AND ANTIBIOTIC DRUGS CONTAINING THE SAID DERIVATIVES

摘要

The present invention relates to cephalosporins having the formula: IMAGE (1) in which COOA is an acidic radical, salt or ester, and R1 represents a group: IMAGE in which RA and RB are H or alkyl or together form a cycloalkyl with the carbon to which they are bonded, R2 and R3 are H, alkyl or alkenyl, R4 and R5 are H, alkyl or alkenyl or together form a ring to the nitrogen atom with which they are bonded. This invention also relates to a process for the preparation of these compounds and to drugs containing them.