A very mild and quantitative oxidation of cephalosporins with dimethyldioxirane
摘要:
The cephalosporins 1-3 and Delta(2)-cephem 4 were oxidized in quantative yields to their sulfones with dimethyldioxirane. While in the case of 2-methylene-cephems (5,6) the exocyclic double bond oxidized simultaneously to the corresponding epoxide, the 3-vinyl derivative (8) or 3-methylene-cephems (7) gave selectively the corresponding vinyl sulfone.