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-4-yl}-2-propenoate (0.66 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 2 hrs. The reaction mixture was neutralized by adding 1N hydrochloric acid and water, 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-4-yl}-2-propenoic acid as pale-yellow crystals (0.56 g, yield 89%). Recrystallization from tetrahydrofuran-hexane gave pale-yellow prism crystals. melting point: 204-205° C.

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