反应详情

A solution of t-butyl nitrite (3.2 g) in tetrahydrofuran (20 ml) was added dropwise to a solution of benzhydryl 2-tert-butoxycarbonylmethoxyimino-2-(5-amino-1,2,4-thiadiazol-3-yl)acetate (syn isomer) (10 g) in tetrahydrofuran (100 ml) at 50° to 53° C. under stirring, and the mixture was stirred at the same temperature for 25 minutes. The reaction mixture was poured into a mixture of ethyl acetate and water. The separated organic layer was washed with an aqueous sodium chloride and dried over magnesium sulfate. The solution was evaporated and the residue was subjected to column chromatography on silica gel. The elution was carried out with a mixture of benzene and ethyl acetate (19:1) and the eluates containing the object compound were evaporated to give benzhydryl 2-tert-butoxycarbonylmethoxyimino-2-(1,2,4-thiadiazol-3-yl)acetate (syn isomer) (7.1 g), mp. 139° to 141° C.

1. stirringthe mixture was stirred at the same temperature for 25 minutes
2. washThe separated organic layer was washed with an aqueous sodium chloride
3. dry with materialdried over magnesium sulfate
4. customThe solution was evaporated
5. washThe elution
6. additionwas carried out with a mixture of benzene and ethyl acetate (19:1)
7. additionthe eluates containing the object compound
8. customwere evaporated