Ethanol → 6-[4-(3,4-Dimethoxybenzoyl)-1-piperazinylcarbony]-3,4-dihydrocarbostyril

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Reaction Steps

To 100 ml of ethanol was added 1.9 g of ethyl 3,4-dimethoxybenzoate, 0.5 g sodium ethylate and 2.4 g of 6-(1-piperazinylcarbonyl)-3,4-dihydrocarbostyril, the mixture was reacted in an autoclave under 110 atmospheric pressure at 140°-150° C. for 6 hours. After the reaction was completed, the reaction mixture was cooled and concentrated under a reduced pressure. The residue thus obtained was dissolved in 200 ml of chloroform and the chloroform solution was washed with 1%-potassium carbonate aqueous solution, a dilute hydrochloric acid and water in this order, then dried with anhydrous sodium sulfate. The solvent was removed by distillation and the residue was treated by means of a silica gel column chromatography (Silica gel: Wako C-200, eluent:chloroform:methanol (volume/volume)=20:1) and the crude crystals was recrystallized from ethanol-chloroform to obtain 250 mg of 6-[4-(3,4-dimethoxybenzoyl)-1-piperazinylcarbonyl]-3,4-dihydrocarbostyril. Colorless granular crystals. Melting point: 238°-239.5° C.

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