A MILD AND EFFICIENT METHOD FOR THE ESTERIFICATION OF CEPHALOSPORANIC ACIDS
作者:Rei Matsueda
DOI:10.1246/cl.1978.979
日期:1978.9.5
A mild and efficient method for the preparation of esters of cephalosporanicacids via the 3-nitro-2-pyridinethiol ester, easily prepared by the reaction of cephalosporanicacid salt with 3-nitro-2-pyridinesulfenyl halide and triphenylphosphine, is reported. Pure Δ3-esters of various cephalosporanicacids were prepared in good yields by this method without accompanying isomerization of the thiazine