反应详情

To a mixture of ethyl (2E)-3-{3-[(4-{[2-(2-furyl)-5-methyl-1,3-oxazol-4-yl]methoxy}-3-methoxybenzyl)oxy]-1-phenyl-1H-pyrazol-5-yl}-2-propenoate (0.73 g), tetrahydrofuran (5 mL) and ethanol (5 mL) was added 1N aqueous sodium hydroxide solution (5 mL), and the mixture was heated under reflux for 1 hr. 1N Hydrochloric acid (5 mL) and water were added to neutralize the reaction mixture, and the precipitated crystals were collected by filtration to give (2E)-3-{3-[(4-{[2-(2-furyl)-5-methyl-1,3-oxazol-4-yl]methoxy}-3-methoxybenzyl)oxy]-1-phenyl-1H-pyrazol-5-yl}-2-propenoic acid as colorless crystals (0.65 g, yield 94%). Recrystallization from ethyl acetate-hexane gave colorless prism crystals. melting point: 191-192° C.

1. temperaturethe mixture was heated
2. temperatureunder reflux for 1 hr
3. filtrationthe precipitated crystals were collected by filtration