7-ACYLAMINO-(OR 7-AMINO)-3-TRIFLUOROMETHYL-SULFONYLOXY-1-CARBA(1-DETHIA)-3-CEPHEM-4-CARBOXYLIC ACIDS AND ESTERS THEREOF

摘要

7 beta -Acylamino-3-trifluoromethylsulfonyloxy-1-carba-3-cephem-4-carboxylic acid antibiotic compounds, esters and salts thereof, and the corresponding 7-amino and protected 7-amino 1-carbacephalosporins are provided. The 3-trifluoromethylsulfonyloxy-substituted 1-carbacephalosporins also are useful in a process for preparing 3-halo-1-carbacephalosporins which comprises reacting a 3-triflate ester with a lithium halide in an aprotic polar solvent.