反应详情

A solution of benzhydryl 7-formamido-3-methylenecepham-4-carboxylate (40.8 g) in methylene chloride (300 ml) and methanol (1.2 l) was cooled at -74° C. in a dry ice-acetone bath. A theoretical amount of ozone was blown through the solution at -74° C. for 10 minutes with stirring, and nitrogen gas was blown through the solution at -74° C. for 10 minutes Dimethyl sulfide (20 ml) was added to the solution at -74° C. The mixture was slowly warmed to ambient temperature and evaporated in vacuo. The residue was subjected to column chromatography on silica gel and eluted with ethyl acetate. The eluent was evaporated in vacuo to give benzhydryl 7-formamido-3-hydroxy-3-cephem-4-carboxylate (34.4 g).

1. customevaporated in vacuo
2. washeluted with ethyl acetate
3. customThe eluent was evaporated in vacuo