反应详情

To a mixture of {3-[(4-{[2-(2-furyl)-5-methyl-1,3-oxazol-4-yl]methoxy}-3-methoxybenzyl)oxy]-1-phenyl-1H-pyrazol-4-yl}acetic acid (0.52 g) and tetrahydrofuran (10 mL) was added borane-tetrahydrofuran (1.02 M tetrahydrofuran solution, 2.0 mL) at 0° C., and the mixture was stirred at room temperature for 1 hr. 1N Hydrochloric acid (5 mL) and water were added to the reaction mixture and the mixture was extracted with ethyl acetate. The ethyl acetate layer was washed successively with saturated aqueous sodium hydrogen carbonate and saturated brine, dried over anhydrous magnesium sulfate and concentrated. The residue was subjected to silica gel column chromatography to give 2-{3-[(4-{[2-(2-furyl)-5-methyl-1,3-oxazol-4-yl]methoxy}-3-methoxybenzyl)oxy]-1-phenyl-1H-pyrazol-4-yl}ethanol as colorless crystals (0.31 g, yield 62%) from a fraction eluted with ethyl acetate-hexane (2:1, v/v). Recrystallization from ethyl acetate-hexane gave colorless prism crystals. melting point: 123-124° C.

1. extractionthe mixture was extracted with ethyl acetate
2. washThe ethyl acetate layer was washed successively with saturated aqueous sodium hydrogen carbonate and saturated brine
3. dry with materialdried over anhydrous magnesium sulfate
4. concentrationconcentrated