反应详情

A mixture of (2E)-3-{3-[(4-{[2-(2-furyl)-5-methyl-4-oxazolyl]methoxy}-3-methoxybenzyl)oxy]-1-phenyl-1H-pyrazol-4-yl}-2-propenoic acid (0.30 g), 1-hydroxybenzotriazole ammonia complex (0.17 g), 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide hydrochloride (0.22 g) and N,N-dimethylformamide (15 mL) was stirred at room temperature for 15 hrs. Water was poured into the reaction mixture, and the precipitated crystals were collected by filtration to give (2E)-3-{3-[(4-{[2-(2-furyl)-5-methyl-4-oxazolyl]methoxy}-3-methoxybenzyl)oxy]-1-phenyl-1H-pyrazol-4-yl}-2-propenamide as colorless crystals (0.25 g, yield 83%). Recrystallization from tetrahydrofuran-hexane gave colorless prism crystals. melting point: 187-188° C.

1. filtrationthe precipitated crystals were collected by filtration