反应详情

To a suspension of (3R)-3-hydroxypyrrolidine hydrochloride (7.00 g, 56.6 mmol) in methylene chloride (210 ml) were added chloroformic acid p-nitrobenzyl ester (13.4 g, 62.3 mmol) and triethylamine (17.4 ml, 125 mmol) in an ice bath. The mixture was stirred at room temperature for 5 hours. After checking the completion of the reaction, the reaction mixture was partitioned between ethyl acetate and saturated aqueous sodium hydrogencarbonate solution. The obtained organic layer was washed with saturated aqueous sodium chloride solution, dried over anhydrous sodium sulfate, filtered and concentrated under reduced pressure. The residue was purified by chromatography on a silica gel column using n-hexane:ethyl acetate (1:1)→ethyl acetate as the eluant to afford (3R)-3-hydroxy-1-(p-nitrobenzyloxycarbonyl)-pyrrolidine (13.6 g, yield 90%) as a pale yellow solid.

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