反应详情

To a solution of (2S,4R)-2-acetyl-4-methanesulfonyloxy-1-(4-nitrobenzyloxycarbonyl)pyrrolidine (2.5 g) in tetrahydrofuran (80 ml) was added pyridinium bromide perbromide (2.59 g) at 5°-10° C. After stirring at room temperature for 3 hours, the mixture was poured into water (80 ml) and ethyl acetate (160 ml). The separated organic layer was washed with 1N hydrochloric acid, saturated aqueous sodium bicarbonate and brine successively dried over magnesium sulfate, and evaporated in vacuo. The oily residue was subjected to a column chromatography on silica gel (60 g) eluting with a mixture of acetone and dichloromethane (1:20 V/V) to give (2S,4R)-2-bromoacetyl-4-methanesulfonyloxy-1-(4-nitrobenzyloxycarbonyl)pyrrolidine (2.98 g).

1. washThe separated organic layer was washed with 1N hydrochloric acid, saturated aqueous sodium bicarbonate and brine
2. dry with materialsuccessively dried over magnesium sulfate
3. customevaporated in vacuo
4. washeluting with a mixture of acetone and dichloromethane (1:20 V/V)