反应详情

Add sec-butyllithium (1.29 mL, 1.8 mmol) dropwise to a solution of (−)-sparteine (0.44 mL, 1.36 mmol) in diethyl ether (10 mL) over 3 min at −78° C. Add N-Boc-pyrrolidine (0.245 mL, 1.4 mmol) in diethyl ether (2 mL) dropwise over 10 min. Stir 2 h, add 2-(S)-dibenzylamino-3-phenylpropionaldehyde (0.69 g, 2.1 mmol) in diethyl ether (1.8 mL) over 5 min and stir 20 min. Add acetic acid (0.16 mL) and warn to room temperature. Add saturated aqueous sodium chloride (20 mL), separate layers, dry (magnesium sulfate), concentrate and purify (silica gel chromatography, eluting with hexanes and ethyl acetate) to give the title compound as a foam (0.421 g, 60%).

1. stirringstir 20 min
2. customwarn to room temperature
3. customAdd saturated aqueous sodium chloride (20 mL), separate layers
4. dry with materialdry (magnesium sulfate)
5. concentrationconcentrate
6. custompurify
7. wash(silica gel chromatography, eluting with hexanes and ethyl acetate)