反应详情

温度

70 °C

27 g of 8-hydroxycarbostyril (VII) and 37 ml of chloroacetyl chloride were dissolved in 250 ml of nitrobenzene, and to the resulting solution was added 85 g of aluminum chloride followed by stirring at 70° C. for 20 hours. 500 ml of 10% aqueous hydrochloric acid was added to the reaction mixture and the nitrobenzene was removed by steam distillation. After cooling the mixture, the precipitated crystals were collected by filtration which were then washed with 300 ml of hot water. Recrystallization from methanol gave 14.0 g of 5-chloroacetyl-8-hydroxycarbostyril (IV) having a melting point of 285°-287° C. (with decomposition) as pale yellow crystals.

1. customthe nitrobenzene was removed by steam distillation
2. temperatureAfter cooling the mixture
3. filtrationthe precipitated crystals were collected by filtration which
4. washwere then washed with 300 ml of hot water
5. customRecrystallization from methanol