反应详情

A dichloromethane (6 mL) solution of 6 (497 mg, 1.03 mmol) was treated with 2,6-lutidine (143 μL, 1.22 mmol) and TBSOTf (0.26 mL, 1.13 mmol). After 1.5 h, 50 mL saturated NaHCO3 was added and the resulting mixture was extracted with 25 mL CH2Cl2. The CH2Cl2 layer was washed with 50 mL 1 M HCl and 50 mL brine. The CH2Cl2 solution was then dried (Na2SO4), filtered and evaporated. Purification by flash chromatography (8% ethyl acetate/hexanes→10%) gave 7 (553 mg, 0.93 mmol, 90%).

1. extractionthe resulting mixture was extracted with 25 mL CH2Cl2
2. washThe CH2Cl2 layer was washed with 50 mL 1 M HCl and 50 mL brine
3. dry with materialThe CH2Cl2 solution was then dried (Na2SO4)
4. filtrationfiltered
5. customevaporated
6. customPurification by flash chromatography (8% ethyl acetate/hexanes→10%)