7.beta.-Acylamino-3-trifluoromethylsulfonyloxy-1-carba-3-cephem-4-carboxyli c 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.
提供了7.beta.-Acylamino-3-trifluoromethylsulfonyloxy-1-carba-3-cephem-4-carboxylic酸类抗生素化合物、
酯类和盐类,以及相应的7-
氨基和保护的7-
氨基1-羧基
头孢菌素。3-三
氟甲基磺酰氧基取代的1-羧基
头孢菌素也可用于制备3-卤代-1-羧基
头孢菌素的过程,该过程包括在无
水极性溶剂中将3-三甲基磺酰酸酯与
锂卤化物反应。