Tetrahydrofuran → 4'-{[4-(1-Ethylpiperidin-4-yl)-5-oxo-7-propyl-4,5-dihydro[1,2,4]triazolo[1,5-a]pyrimidin-6-yl]methyl}biphenyl-2-carbonitrile

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A mixture of 4′-{[4-(1-benzylpiperidin-4-yl)-5-oxo-7-propyl-4,5-dihydro[1,2,4]triazolo[1,5-a]pyrimidin-6-yl]methyl}biphenyl-2-carbonitrile (4.82 g), 10% palladium-carbon (2.39 g), tetrahydrofuran (30 mL) and ethanol (60 mL) was stirred at room temperature for 2 days under a hydrogen atmosphere. The reaction mixture was filtered, and the solvent was evaporated. The residue was purified by basic silica gel chromatography [eluent: methanol/ethyl acetate=0/100→5/95 (volume ratio)] to give the title compound as a colorless amorphous compound (146 mg, 3%).

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