反应详情

To a solution of triphenylphosphine (39.5 g, 0.15 mol), (2-((tert-butyldimethylsilyl)-oxy)phenyl)methanol (Ia) (12.23 g, 0.05 mol) and imidazole (10.5 g, 0.15 mol) in acetonitrile and diethyl ether (500 ml, CH3CN/Et2O=1:3, v/v) was added bromine (7.7 mL, 0.15 mol) dropwise at 0° C. with stirring. The reaction mixture was stirred at 0° C. for 20 minutes, during which time a white solid precipitated. The solution was carefully decanted and washed with brine (100 mL). The remaining solid was washed with diethyl ether (2×160 mL). All of the organic solutions were combined and concentrated. Hexane (200 ml) was added to the residue, and the solid was removed by filtration. The hexane solution was concentrated to provide the crude product. The product was purified by vacuum distillation (66-68° C. 0.093 Torr) reduced distillation to provide compound IIa (10.4 g, 67%) as a colorless oil.

1. stirringThe reaction mixture was stirred at 0° C. for 20 minutes, during which time a white solid
2. customprecipitated
3. customThe solution was carefully decanted
4. washwashed with brine (100 mL)
5. washThe remaining solid was washed with diethyl ether (2×160 mL)
6. concentrationconcentrated
7. additionHexane (200 ml) was added to the residue
8. customthe solid was removed by filtration
9. concentrationThe hexane solution was concentrated