反应详情

温度

100 °C

To a solution of 4-amino-2,3-difluorophenol (1.59 g, 7.49 mmol) in DMSO (10 mL) was added potassium tert-butoxide (1.1 g, 8.98 mmol), and the reaction mixture was stirred for 2 hours. Chloride 301 (1.6 g, 4.99 mmol) was added and the reaction mixture was heated at 100° C. for 2 hours. The mixture was cooled down then poured into water (150 mL) at 40-45° C. and stirred for 30 min. The precipitate was collected by filtration, washed with water and dried overnight. The crude product was triturated with EtOAc/Hexane (2/1, 100 mL) for 1 h, to afford title compound 302 (1.7 g, 79% yield) as a pale violet solid. 1H NMR (300 MHz, DMSO-d6) δ (ppm): 8.70 (d, J=2.1 Hz, 1H), 8.53 (d, J=5.4 Hz, 1H), 8.39 (s, 1H), 8.31 (d, J=8.1 Hz, 1H), 7.98 (dd, J=8.1, 2.1 Hz, 1H), 7.10-7.00 (m, 1H), 6.71 (d, J=5.1 Hz, 1H), 6.72-6.61 (m, 1H), 5.90 (s, 1H), 5.64 (s, 2H), 4.16-3.96 (m, 4H).

1. temperatureThe mixture was cooled down
2. stirringstirred for 30 min
3. filtrationThe precipitate was collected by filtration
4. washwashed with water
5. customdried overnight
6. customThe crude product was triturated with EtOAc/Hexane (2/1, 100 mL) for 1 h