Novel thioester derivatives of thiazolyl acetic acid and their use in the preparation of cephalosporin compounds

摘要

The present invention provides novel thioester derivatives of thiazolyl acetic acid of the general formula (I), also, the invention provides a method for preparation of the thioester derivatives and reaction of the thioester derivatives with cephem carboxylic acids to produce cephalosporin antibiotic compounds having general formula (II).