反应详情

温度

80 °C

To a solution of 3-chloro-4-(trifluoromethoxy)benzonitrile (1.0 g, 4.51 mmol) and hydroxylamine hydrochloride (1.5 eq, 0.47 g, 6.77 mmol) in ethanol (10 ml) was added N-ethyl-N-isopropylpropan-2-amine (1.6 eq, 1.26 ml, 7.22 mmol) and refluxed at 80° C. for 12 hours under N2. Allow to cool to rt. Dilute with EtOAc (25 ml), wash with water (25 ml), brine (25 ml), dry, concentrate in vacuo afforded (Z)-3-chloro-N′-hydroxy-4-(trifluoromethoxy)benzimidamide (0.71 g, 62.1%, white solid). Used crude in the next step. HRMS(B) m/z 254.0070

1. temperatureto cool to rt
2. washwash with water (25 ml), brine (25 ml)
3. customdry
4. concentrationconcentrate in vacuo