反应详情

温度

50 °C

To a stirred solution of 4-fluorobenzaldehyde (124 g, 979 mmoles) in acetonitrile (620 mL, 5 volumes) and toluene (620 mL, 5 volumes) was added formamide (110 g, 2.45 moles, 2.5 equiv.) followed by chlorotrimethylsilane (119 g, 1.07 moles, 1.1 equiv.). The reaction was heated at 50° C. under nitrogen for 5 hours. To the resulting white slurry was added p-toluenesulfinic acid (230 g, 1.47 moles, 1.5 equiv.) and the reaction was heated at 50° C. for an additional 5 hours then cooled to ambient temperature. Methanol (250 mL) and t-butyl methyl ether (620 mL) were added. After 15 minutes the reaction was poured into water (3 L) pre-cooled to 0° C. After stirring for 30 minutes at 0° C., the product was collected by suction filtration and rinsed with t-butyl methyl ether (250 mL). The product, a white, crystalline solid, was dried to a constant weight at 40° C./<1 mm Hg to afford 270 g (879 mmoles) of desired product (90% yield). 1H NMR (300 MHz, CD3CN) δ7.99 (1H, s), 7.92 (1H, m), 7.71 (2H, d, J=8.3 Hz), 7.49 (2H, dd, J=5.3, 8.8 Hz), 7.39 (2H, d, J=8.1 Hz), 7.16 (2H, t, J=8.8 Hz), 6.31 (1H, d, J=10.6 Hz), 2.42 (3H, s).

1. temperaturethe reaction was heated at 50° C. for an additional 5 hours
2. temperaturethen cooled to ambient temperature
3. temperaturepre-cooled to 0° C
4. filtrationthe product was collected by suction filtration
5. washrinsed with t-butyl methyl ether (250 mL)
6. customThe product, a white, crystalline solid, was dried to a constant weight at 40° C./<1 mm Hg