反应详情

A mixture of CHCl3 (100 mL) with (S)-t-butyl 2-(hydrazinecarbonyl)pyrrolidine-1-carboxylate (4.791 g), 2-((t-butyldiphenylsilyl)oxy)acetic acid (6.28 g), WSC.HCl (4.371 g) and HOBt.H2O (3.081 g) was stirred at room temperature for 15 hours. To the reaction mixture, a saturated aqueous solution of NH4Cl (500 mL) was added, followed by extraction with AcOEt (500 mL). The organic layer was washed successively with saturated aqueous sodium bicarbonate (500 mL) and brine (500 mL), dried (MgSO4), filtered and concentrated to give a crude product, which was further purified by silica gel chromatography (AcOEt/hexane) to give the titled compound (6.42 g, colorless amorphous.)

1. extractionfollowed by extraction with AcOEt (500 mL)
2. washThe organic layer was washed successively with saturated aqueous sodium bicarbonate (500 mL) and brine (500 mL)
3. dry with materialdried (MgSO4)
4. filtrationfiltered
5. concentrationconcentrated
6. customto give a crude product, which
7. customwas further purified by silica gel chromatography (AcOEt/hexane)