Dimethylformamide → ethyl (2E)-3-{1-ethyl-3-[(4-{[2-(2-furyl)-5-methyl-1,3-oxazol-4-yl]methoxy}-3-methoxybenzyl)oxy]-1H-pyrazol-4-yl}-2-propenoate

Participants

Reaction Steps

To a mixture of 1-ethyl-3-[(4-{[2-(2-furyl)-5-methyl-1,3-oxazol-4-yl]methoxy}-3-methoxybenzyl)oxy]-1H-pyrazole-4-carbaldehyde (0.50 g), ethyl diethylphosphonoacetate (0.27 g) and N,N-dimethylformamide (10 mL) was added sodium hydride (60% in oil, 0.05 g) at room temperature, and the mixture was stirred at the same temperature for 15 hrs. Water was poured into the reaction mixture, and the precipitated crystals were collected by filtration to give ethyl (2E)-3-{1-ethyl-3-[(4-{[2-(2-furyl)-5-methyl-1,3-oxazol-4-yl]methoxy}-3-methoxybenzyl)oxy]-1H-pyrazol-4-yl}-2-propenoate as colorless crystals (0.51 g, yield 91%). Recrystallization from ethyl acetate-hexane gave colorless prism crystals. melting point: 149-150° C.

Provenance & Evidence