反应详情

温度

180 °C

A mixture of 37 (4.0 g, 17.6 mmol), 2-fluoro-4-nitrophenol (5.5 g, 35.0 mmol) and K2CO3 (12.1 g, 87.5 mmol) in Ph2O was heated at 180° C. for 5 hours. The mixture was cooled to room temperature, diluted with EtOAc and washed with water. The organic phase was collected, dried over anhydrous sodium sulfate and the solvents were removed under reduced pressure. The residue was purified by flash chromatography using hexane—AcOEt (70:30) as an eluent. The product from the column was re-crystallized from a mixture of ethyl acetate-hexanes to afford 38 (3.6 g, 59% yield) as a white solid. 1H NMR (400 MHz, DMSO-d6) δ(ppm): 8.69 (d, J=5.2 Hz, 1H), 8.47 (dd, J=2.4 and 10.0 Hz, 1H), 8.27 (s, 1H), 7.77 (dd, J=8.0 and 9.2 Hz, 1H), 7.06 (dd, J=0.8 and 5.2 Hz, 1H), 3.93 (s, 3H).

1. temperatureThe mixture was cooled to room temperature
2. washwashed with water
3. customThe organic phase was collected
4. dry with materialdried over anhydrous sodium sulfate
5. customthe solvents were removed under reduced pressure
6. customThe residue was purified by flash chromatography
7. customThe product from the column was re-crystallized from a mixture of ethyl acetate-hexanes