反应详情

To a solution of boron trifluoride-diethyl etherate (0.64 g, 4.50 mmol) and 4-(2-fluoropyridin-3-yl)cyclohexanone (0.79 g, 4.09 mmol) in DCM (8 mL) at −25° C. under argon was added (trimethylsilyl)diazomethane (2.25 mL, 5.18 mmol, 2.0 M in hexanes). The reaction was stirred for 2 h at that temperature, water was added, and the mixture was extracted with DCM (2×). The combined organic extracts were washed with 10:1 saturated ammonium chloride/ammonium hydroxide mixture (1×), water (1×), saturated aqueous sodium chloride (1×), and dried over anhydrous magnesium sulfate. The mixture was filtered and the filtrate concentrated in vacuo. The resulting oil was purified by silica gel chromatography to give 4-(2-fluoropyridin-3-yl)cycloheptanone. MS (ESI, pos. ion) m/z: 208.1 (M+1).

1. additionwas added
2. extractionthe mixture was extracted with DCM (2×)
3. washThe combined organic extracts were washed with 10:1 saturated ammonium chloride/ammonium hydroxide mixture (1×), water (1×), saturated aqueous sodium chloride (1×)
4. dry with materialdried over anhydrous magnesium sulfate
5. filtrationThe mixture was filtered
6. concentrationthe filtrate concentrated in vacuo
7. customThe resulting oil was purified by silica gel chromatography