反应详情

24.3 g of 8-hydroxy-3,4-dihydrocarbostyril (VII) and 68 g of chloroacetyl chloride were added to 130 ml of carbon disulfide, and 200 g of aluminum chloride was added slowly to the mixture while stirring and cooling in ice-water. The mixture was stirred for 6 hours at a temperature of 60° to 70°C and carbon disulfide was distilled off. The resulting residue was poured into 500 ml of ice-water. The precipitated crystals were filtered, washed with water and recrystallized twice from methanol to give 8.0 g of 5-chloroacetyl-8-hydroxy-3,4-dihydrocarbostyril (IV) as light yellow crystals having a melting point of 189° to 191°C.

1. additionwas added slowly to the mixture
2. distillationwas distilled off
3. additionThe resulting residue was poured into 500 ml of ice-water
4. filtrationThe precipitated crystals were filtered
5. washwashed with water
6. customrecrystallized twice from methanol