6-[1-Oxo-4-(4-phenylpiperazinyl)-butyl]-3,4-dihydrocarbostyril → 6-[1-Hydroxy-4-(4-phenyl-1-piperazinyl)butyl]-3,4-dihydrocarbostyril

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Reaction Steps

2.0 Grams of 6-[1-oxo-4-(4-phenylpiperazinyl)-butyl]-3,4-dihydrocarbostyril and 0.5 g of palladium black were dispersed in 80 ml of water and stirred at a room temperature under 2 atmospheric pressure of hydrogen gas for 5 hours. The reaction mixture was filtered for removing the palladium black and the mother liquor was concentrated under a reduced pressure and the residue thus obtained was crystallized from acetone and a small amount of ethanol. The crude crystals thus obtained were collected by filtration and recrystallized from isopropanol to obtain 1.5 g of 6-[1-hydroxy-4-(4-phenyl-1-piperazinyl)butyl]-3,4-dihydrocarbostyril in colorless needle like crystals.

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