反应详情

温度

70 °C

Water (5 mL) and TFA (2 mL) were added to a solution of tert-butyl 3-(2,2-difluoroethoxy)-4,4-dimethoxypiperidine-1-carboxylate obtained in Example (121b) (1.5 g, 4.67 mmol) in THF (30 mL), and the mixture was stirred at 70° C. for one hour. Sodium bicarbonate was added to a pH of about 8, followed by extraction with ethyl acetate. The organic layer was washed with brine, dried over anhydrous magnesium sulfate, and concentrated under reduced pressure. The resulting residue was purified by silica gel column chromatography (elution solvent: hexane/ethyl acetate=10/1, 5/1, 2/1, 1/1) to obtain 1.1 g of the title compound as a light brown oily substance (86%).

1. extractionfollowed by extraction with ethyl acetate
2. washThe organic layer was washed with brine
3. dry with materialdried over anhydrous magnesium sulfate
4. concentrationconcentrated under reduced pressure
5. customThe resulting residue was purified by silica gel column chromatography (elution solvent: hexane/ethyl acetate=10/1, 5/1, 2/1, 1/1)