process for rpodurre acids tiometil - 3 - 4 - carboxylic cefem replaced as intermediates for cephalosporins

摘要

This disclosure relates to a novel process for producing 7-(substituted)-amino-3-substituted thiomethyl- DELTA 3-cephem-4-carboxylic acids which are intermediate products of cephalosporins being valuable antibacterial compounds for use in mammals including man.