反应详情

Mesyl chloride (0.66 ml) and potassium carbonate (1.38 g) were added to a solution of benzhydryl 7-formamido-3-hydroxy-3-cephem-4-carboxylate (2.05 g) in N,N-dimethylformamide (6 ml) at -30° C. The mixture was stirred at -30°°C. for 30 minutes. Mesyl chloride (0.4 ml) was added to the mixture. The reaction mixture was stirred at -30°C for 20 minutes, poured into ice-water and extracted with ethyl acetate. The extract was washed with water, dried over magnesium sulfate and filtered, and the filtrate was evaporated in vacuo. The residue was dissolved in a small amount of ethyl acetate and the mixture was subjected to column chromatography on silica gel and eluted with a mixture of benzene and ethyl acetate (1:1). The eluent was evaporated in vacuo. The residue was triturated with diisopropyl ether to give benzhydryl 7-formamido-3-mesyloxy-3-cephem-4-carboxylate (0.85 g).

1. stirringThe reaction mixture was stirred at -30°C for 20 minutes
2. extractionextracted with ethyl acetate
3. washThe extract was washed with water
4. dry with materialdried over magnesium sulfate
5. filtrationfiltered
6. customthe filtrate was evaporated in vacuo
7. dissolutionThe residue was dissolved in a small amount of ethyl acetate
8. washeluted with a mixture of benzene and ethyl acetate (1:1)
9. customThe eluent was evaporated in vacuo
10. customThe residue was triturated with diisopropyl ether