反应详情

Lithium aluminium hydride (6.64 g) was added to a solution of ethyl 1-benzyl-3-benzyloxy-1H-pyrazole-4-carboxylate (58.90 g) in tetrahydrofuran (500 ml) at 0° C., and the mixture was stirred at room temperature for 30 minutes. After the reaction mixture was poured into water and the precipitate was removed by filtration, the filtrate was extracted with ethyl acetate. The ethyl acetate layer was washed with saturated aqueous sodium chloride solution, dried (MgSO4), and then concentrated. The residue was subjected to silica gel column chromatography, and (1-benzyl-3-benzyloxy-1H-pyrazol-4-yl)methanol (45.30 g, yield: 88%) was obtained as colorless crystals from the fraction eluted with ethyl acetate. This was recrystallized from ethyl acetate-hexane. Melting point: 79–80° C.

1. customthe precipitate was removed by filtration
2. extractionthe filtrate was extracted with ethyl acetate
3. washThe ethyl acetate layer was washed with saturated aqueous sodium chloride solution
4. dry with materialdried (MgSO4)
5. concentrationconcentrated