反应详情

温度

0 °C

To a solution of the title compound of step (A) (10 g, 50 mmol) in CH2Cl2 (80 ml) cooled at 0° C. was added 2,6-lutidine (7.57 mL, 65 mmol), followed by dropwise addition of tert-butyldimethylsilyl trifluoromethanesulfonate (14.92 mL, 65 mmol). The reaction mixture was stirred at 0° C. for 45 minutes, then quenched with H2O (20 mL) and partitioned between EtOAc (450 mL) and H2O (150 mL). The organic layer was separated and washed with 10% NaHCO3 solution, brine (2×), dried (MgSO4) and concentrated in vacuo to give a yellow syrup, which was chromatographed eluting with 10-50% EtOAc/hexane to afford 13.89 g (88%) of the title compound of this step as a light yellow oil.

1. customquenched with H2O (20 mL)
2. custompartitioned between EtOAc (450 mL) and H2O (150 mL)
3. customThe organic layer was separated
4. washwashed with 10% NaHCO3 solution, brine (2×)
5. dry with materialdried (MgSO4)
6. concentrationconcentrated in vacuo
7. customto give a yellow syrup, which
8. customwas chromatographed
9. washeluting with 10-50% EtOAc/hexane