CEPHALOSPORIN ANALOGS AND METHODS FOR PRODUCTION THEREOF

摘要

The present invention relates to a cephalosporin analog of the formula: wherein X represents an amino group, an azido group or a protected amino group, Hal represents a halogen atom and R represents a carboxyl group or a protected carboxyl group, and the salts thereof. These compounds are useful intermediates in the preparation of highly active cephalosporin derivatives.