Sodium borohydride → 6-(1-Hydroxy-4-chlorobutyl)-3,4-dihydrocarbostyril

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Reaction Steps

2.0 Grams of 6-(1-oxo-4-chlorobutyl)-3,4-dihydrocarbostyril was mixed with 100 ml of methanol, and the mixture was stirred at a room temperature. Then 1.0 g of sodium borohydride was added to the mixture gradually. After the reaction mixture was stirred at a room temperature for 2 hours, methanol was removed by distillation under a reduced pressure. The residue was extracted with chloroform and the chloroform layer was washed with water, and dried. Chloroform was removed by distillation under a reduced pressure, then the residue thus obtained was recrystallized from ethanol-water to obtain 1.2 g of 6-(1-hydroxy-4-chlorobutyl)-3,4-dihydrocarbostyril in colorless needle-like crystals. Melting point: 120°-121° C.

Provenance & Evidence