反应详情

Methanol (6.3 mL) and 1N aqueous sodium hydroxide solution (2.6 mL) were added to ethyl 1-{[(5-{3-fluoro-4-[4-(trifluoromethyl)-1-{[2-(trimethylsilyl)ethoxy]methyl}-1H-imidazol-2-yl]phenyl}-4-methylpyridin-2-yl)oxy]methyl}cyclobutanecarboxylate (315 mg) and the mixture was refluxed for 1 hour. Methanol was distilled off under reduced pressure, and the residue was neutralized by 1N hydrochloric acid. The mixture was extracted with ethyl acetate, the organic layer was washed with a saturated brine, and dried over anhydrous magnesium sulfate. After concentrating the mixture under reduced pressure, the obtained residue was purified by silica gel column chromatography (chloroform:methanol=100:0 to 95:5) to obtain 1-{[(5-{3-fluoro-4-[4-(trifluoromethyl)-1-{[2-(trimethylsilyl)ethoxy]methyl}-1H-imidazol-2-yl]phenyl}-4-methylpyridin-2-yl)oxy]methyl}cyclobutanecarboxylic acid (308 mg).

1. temperaturethe mixture was refluxed for 1 hour
2. distillationMethanol was distilled off under reduced pressure
3. extractionThe mixture was extracted with ethyl acetate
4. washthe organic layer was washed with a saturated brine
5. dry with materialdried over anhydrous magnesium sulfate
6. concentrationAfter concentrating the mixture under reduced pressure
7. customthe obtained residue was purified by silica gel column chromatography (chloroform:methanol=100:0 to 95:5)