反应详情

温度

80 °C

To a solution of (3R)-3-methanesulfonyloxy-1-(p-nitrobenzyloxycarbonyl)pyrrolidine (7.50 g, 21.8 mmol) (obtained as described in Reference Example 52(2)) in dimethylformamide (225 ml) was added potassium acetate (6.41 g, 65.3 mmol), and the mixture was stirred in an oil bath (80° C.) overnight. After checking the completion of the reaction, the reaction mixture was partitioned between ethyl acetate and saturated aqueous sodium hydrogencarbonate solution. The organic layer was washed successively with 10% aqueous sodium chloride solution and saturated aqueous sodium chloride solution, dried over anhydrous sodium sulfate, filtered and concentrated under reduced pressure. The obtained residue was purified by chromatography on a silica gel column using n-hexane:ethyl acetate (2:1→1:2) as the eluant to afford (3S)-3-acetoxy-1-(p-nitrobenzyloxycarbonyl)pyrrolidine (5.51 g, yield 82%) as white crystals.

1. customthe completion of the reaction
2. customthe reaction mixture was partitioned between ethyl acetate and saturated aqueous sodium hydrogencarbonate solution
3. washThe organic layer was washed successively with 10% aqueous sodium chloride solution and saturated aqueous sodium chloride solution
4. dry with materialdried over anhydrous sodium sulfate
5. filtrationfiltered
6. concentrationconcentrated under reduced pressure
7. customThe obtained residue was purified by chromatography on a silica gel column