反应详情

Imidazole (3.65 g, 53.6 mmol) and TBSCl (6.47 g, 42.9 mmol) were added to the solution of compound 255A (4.00 g, 35.7 mmol) in 50 mL of DMF. The mixture was stirred at rt for 2 h and then the reaction mixture was poured into ether. The ether solution was washed with water (1×), 1 N HCl (1×), water (1×) and brine (1×). The organic layer was dried over Na2SO4 and concentrated under reduced pressure. Purification by flash chromatography on silica gel eluting with 30% CH2Cl2/70% hexane gave 7.4 g (32.7 mmol, 91.7%) of 255B as a colorless oil.

1. washThe ether solution was washed with water (1×), 1 N HCl (1×), water (1×) and brine (1×)
2. dry with materialThe organic layer was dried over Na2SO4
3. concentrationconcentrated under reduced pressure
4. customPurification by flash chromatography on silica gel eluting with 30% CH2Cl2/70% hexane