反应详情

To a solution of 2-tert-butoxycarbonylmethoxyimino-2-(5-amino-1,2,4-thiadiazol-3-yl)acetic acid (syn isomer (20 g) in ethyl acetate (200 ml) and tetrahydrofuran (100 ml) was added dropwise a solution of diphenyldiazomethane in ethyl acetate (0.9 m mole/ml, 80 ml) at ambient temperature, and the mixture was stirred for an hour. The reaction mixture was washed with a saturated aqueous sodium bicarbonate and an aqueous sodium chloride, and then dried over magnesium sulfate. The solution was evaporated to give benzhydryl 2-tert-butoxycarbonylmethoxyimino-2-(5-amino-1,2,4-thiadiazol-3-yl)acetate (syn isomer) (15.0 g), mp 164° C. (dec.).

1. washThe reaction mixture was washed with a saturated aqueous sodium bicarbonate
2. dry with materialan aqueous sodium chloride, and then dried over magnesium sulfate
3. customThe solution was evaporated