反应详情

To a solution of benzhydryl 7β-[2-cyclopropyloxyimino-2-(2-formamidothiazol-4-yl)acetamido]-3-chloromethyl-3-cephem-4-carboxylate (syn isomer) (3 g) in methylene chloride (300 ml) was dropwise added a solution of m-chloroperbenzoic acid (0.79 g, 80% purity) in methylene chloride (10 ml) below 5° C. The mixture was stirred for 1.5 hours below 5° C. to give precipitates. The precipitates were collected, washed with methylene chloride, and dried over phosphorus pentoxide to give benzhydryl 7β-[2-cyclopropyloxyimino-2-(2-formamidothiazol-4-yl)acetamido]-3-chloromethyl-3-cephem-4carboxylate 1-oxide (syn isomer) as a solid.

1. customto give
2. customprecipitates
3. customThe precipitates were collected
4. washwashed with methylene chloride
5. dry with materialdried over phosphorus pentoxide