反应详情

To a solution of ethyl 3-[3-ethoxy-1-(4-hydroxy-3-methoxybenzyl]-1H-pyrazol-4-yl]propionate (505 mg) in N,N-dimethylformamide (10 ml), sodium hydride (60%, oily, 58.0 mg) was added at 0° C., and then the solution was stirred at room temperature for 30 minutes. 4-Chloromethyl-5-methyl-2-(2-thienyl)oxazole (310 mg) was added to the reaction mixture, which was stirred at room temperature for one hour. The reaction mixture was poured into water, which was extracted with ethyl acetate. The ethyl acetate layer was washed with water, then, with saturated aqueous sodium chloride solution, and dried (MgSO4) and concentrated. The residue was subjected to silica gel column chromatography, and ethyl 3-[3-ethoxy-1-[3-methoxy-4-[5-methyl-2-(2-thienyl)-4-oxazolylmethoxy]benzyl]-1H-pyrazol-4-yl]propionate (500 mg, yield: 66%) was obtained as a colorless oily substance from the fraction eluted with ethyl acetate-hexane (1:1, volume ratio).

1. stirringwas stirred at room temperature for one hour
2. extractionwas extracted with ethyl acetate
3. washThe ethyl acetate layer was washed with water
4. dry with materialwith saturated aqueous sodium chloride solution, and dried (MgSO4)
5. concentrationconcentrated