反应详情

To a mixture of 3-[(4-{[2-(2-furyl)-5-methyl-1,3-oxazol-4-yl]methoxy}benzyl)oxy]-1-phenyl-1H-pyrazole-4-carbaldehyde (0.50 g), ethyl diethylphosphonoacetate (0.25 g) and N,N-dimethylformamide (20 mL) was added sodium hydride (60% in oil, 0.050 g) under ice-cooling. The mixture was stirred at room temperature for 15 hrs. Water was added to the reaction mixture and the precipitated crystals were collected by filtration to give ethyl (2E)-3-(3-[(4-{[2-(2-furyl)-5-methyl-1,3-oxazol-4-yl]methoxy}benzyl)oxy]-1-phenyl-1H-pyrazol-4-yl}-2-propenoate as colorless crystals (0.48 g, yield 83%). Recrystallization from ethyl acetate-hexane gave colorless prism crystals. melting point: 142-143° C.

1. temperaturecooling
2. filtrationthe precipitated crystals were collected by filtration