反应详情

1-(4-bromo-2,5-difluorophenyl)ethanone (500 mg, 1.042 mmol) was dissolved in ethanol (10 mL), then hydrazine hydrate (57.4 mg, 1.147 mmol) added and stirred at RT for 16 hr. A pale yellow solid was filtered off and the filtrate was concentrated under reduced pressure to obtain the crude title compound as a brown-yellow solid (249 mg, 54% yield); 1H NMR (500 MHz, CHLOROFORM-d)delta 2.13 (3H, d, J=2.99 Hz), 7.28 (1H, dd, J=9.85, 5.60 Hz), 7.34 (1H, dd, J=9.14, 6.62 Hz).

1. filtrationA pale yellow solid was filtered off
2. concentrationthe filtrate was concentrated under reduced pressure