反应详情

Lithium aluminium hydride (2.50 g) was added to a solution of ethyl 1-benzyl-5-phenyl-1H-pyrazole-4-carboxylate (20.2 g) in tetrahydrofuran (300 ml) at 0° C., and the mixture was stirred at room temperature for one hour. Sodium sulfate decahydrate (21.23 g) and hexane (100 ml) were added to the reaction mixture, and the mixture was stirred at room temperature for one hour. After the precipitate was removed by filtration, the filtrate was concentrated. The residue was subjected to silica gel column chromatography, and (1-benzyl-5-phenyl-1H-pyrazol-4-yl)methanol (17.4 g, yield: 100%) was obtained as a colorless oily substance from the fraction eluted with ethyl acetate-hexane (1:1, volume ratio). NMR(CDCl3) δ: 4.46(2H, s), 5.25(2H, s), 6.99–7.04(2H, m), 7.23–7.32(5H, m), 7.41–7.45(3H, m), 7.69(1H, s).

1. stirringthe mixture was stirred at room temperature for one hour
2. customAfter the precipitate was removed by filtration
3. concentrationthe filtrate was concentrated