反应详情

A solution of 280 mg (5 mmol) of potassium hydroxide in 10 ml of ethanol were added to a solution of 1.37 g (3.8 mmol) of 3(S)-azido-4-phenyl-1-(p-toluenesulphonyloxy)-2(S)-butanol in 50 ml of ethanol and the mixture was stirred at room temperature for 1 hour. The mixture was then evaporated to dryness and the residue was partitioned between water and dichloromethane. The aqueous phase was back-extracted twice with dichloromethane. The organic phases were combined, dried over anhydrous magnesium sulphate and evaporated to give an oil which was purified by flash chromatography on silica gel using n-hexane/ethyl acetate (4:1) for the elution. There was obtained 0.47 g of 2(S)-[1(S)-azido-2-phenylethyl]oxirane; MS: m/e 189 [M]+.

1. customThe mixture was then evaporated to dryness
2. customthe residue was partitioned between water and dichloromethane
3. extractionThe aqueous phase was back-extracted twice with dichloromethane
4. dry with materialdried over anhydrous magnesium sulphate
5. customevaporated
6. customto give an oil which
7. customwas purified by flash chromatography on silica gel
8. washfor the elution