反应详情

温度

60 °C

To a solution of 4-Bromo-2-fluorobenzonitrile 11 (800 g, 4 mol, 1 eq), hydroxylamine hydrochloride (695 g, 10 mol, 2.5 eq) in MeOH (2 L, 2.5 vol) was added Et3N (485 g, 4.8 mol, 1.2 eq), then the mixture was stirred at 60° C. for 40 min and checked by HPLC (no nitrile remaining) Reaction was then quenched by H2O (30 L), and lots of off-white solid was separated out, and then filtered, the filter cake was washed with water (10 L×2) and 1350 g wet 4-bromo-2-fluoro-N-hydroxybenzimidamide 24 was obtained with 96% purity

1. customReaction
2. customwas then quenched by H2O (30 L), and lots of off-white solid
3. customwas separated out
4. filtrationfiltered
5. washthe filter cake was washed with water (10 L×2)