Vesnarinone → 1-Acetyl-6-[4-(3,4-dimethoxybenzoyl)-1-piperazinyl]-3,4-dihydrocarbostyril

Participants

Reaction Steps

Sodium hydride (60% in oil, 263 mg) was suspended in dimethylformamide (DMF) (30 ml). To the suspension was added 6-[4-(3,4-dimethoxybenzoyl)-1-piperazinyl]-3,4-dihydrocarbostyril (2 g) and the mixture was stirred at 70° to 80° C. for 30 minutes. After cooling, to the mixture was added slowly acetyl chloride (0.43 m/g) with stirring and under ice-cooling, and the mixture was stirred at the same temperature for 5 minutes. After completion of reaction, the reaction mixture was poured into ice-water and extracted with chloroform. The chloroform layer was washed successively with water and saturated saline solution and dried over magnesium sulfate. The chloroform extract was evaporated under reduced pressure. The resultant residue was purified by silica-gel column chromatography (eluent:dichloromethane:methanol=100:1) and recrystallized from a mixture of dichloromethane and diethyl ether to give 1-acetyl-6-[4-(3,4-dimethoxybenzoyl)-1-piperazinyl]-3,4-dihydrocarbostyril (700 mg).

Provenance & Evidence