反应详情

温度

80 °C

A mixture of N-Methyl-2-fluoro-4-aminobenzamide (Formula 39) (62 mg, 0.37 mmol), cyclopentanone (0.07 mL, 0.74 mmol) and TMSCN (0.1 mL, 0.74 mmol) was heated to 80° C. and stirred for 13 h. To the medium was added ethyl acetate (2×20 mL) and then washed with water (2×20 mL). The organic layer was dried over MgSO4 and concentrated and the residue was purified with silica gel column chromatography (dichloromethane:acetone, 95:5) to give N-Methyl 2-fluoro-4-(1-cyanocyclopentyl)aminobenzamide (Formula 43) (61 mg, 63%) as a white solid. 1H NMR δ 7.95 (dd, 1H, J=8.8, 8.8 Hz), 6.65 (br s, 1H), 6.59 (dd, 1H, J=8.8, 2.3 Hz), 6.50 (dd, 1H, J=14.6, 2.3 Hz), 4.60 (br s, 1H), 2.99 (dd, 3H, J=4.8, 1.1 Hz), 2.36-2.45 (m, 2H), 2.10-2.18 (m, 2H), 1.82-1.95 (m, 4H).

1. washwashed with water (2×20 mL)
2. dry with materialThe organic layer was dried over MgSO4
3. concentrationconcentrated
4. customthe residue was purified with silica gel column chromatography (dichloromethane:acetone, 95:5)