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0 °C

A mixture of 1-benzyloxy-3-chloro-7-trifluoromethylquinoxalin-2(1H)-one (27 g, 76 mmol) and hydrazine hydrate (14.7 ml, 0.30 mol) in 250 ml of dichloromethane was stirred at 0° C. for 2 h. The precipitate was isolated by filtration, washed with dichloromethane and water and dried to give 22.8 g (76%) of the title compound. M.p. 174°-176° C.

1. customThe precipitate was isolated by filtration
2. washwashed with dichloromethane and water
3. customdried