反应详情

温度

90 °C

To a 500 mL round bottom flask, 3-bromo-4-fluoraniline (5 g, 0.0261 mol), water (300 mL), chloral hydrate (5.19 g, 0.0314 mol), hydroxylamine hydrochloride (5.8 g, 0.0835 mol) and sodium sulfate (25 g) were added. To this reaction mixture, conc. HCl (7.5 mL) was slowly added. The reaction mixture was stirred at 90° C. for 3 h. The precipitate was formed and was collected by filtration. The solid was dried to get the title compound (4.2 g, 61%). 1H NMR (300 MHz, DMSO-d6): δ 12.28 (s, 1H), 10.51 (s, 1H), 8.12 (dd, J=2.4 Hz, J=2.7 Hz, 1H), 7.68 (m, 2H), 7.36 (t, J=8.7 Hz, 1H); LC-MS (ESI): Calculated mass: 260.0; Observed mass: 259.0 [M−H]+ (RT: 0.88 min).

1. customThe precipitate was formed
2. filtrationwas collected by filtration
3. customThe solid was dried