反应详情

温度

-78 °C

(5S)-2-(5-{3-[(1S)-2-Methoxy-1-methylethoxy]-5-[4-(methylsulfonyl)phenoxy]phenyl}-1H-pyrrol-2-yl)-5-methyl-4,5-dihydro-1,3-oxazole (280 mg, 0.58 mmol) synthesized in Example (31b) was dissolved in dichloromethane (10 mL) and cooled to −78° C., and a 1.0 mol/l boron tribromide dichloromethane solution (0.61 mL, 0.61 mmol) was added under nitrogen atmosphere. After the temperature was raised naturally and the solution was stirred at room temperature for 30 minutes, a saturated aqueous sodium hydrogencarbonate solution was added to neutralize the reaction solution, followed by extraction with dichloromethane (60 mL). The organic layer was washed with saturated brine, and subsequently dried over anhydrous magnesium sulfate. The solvent was distilled off under reduced pressure, and the resulting residue was purified using silica gel column chromatography (elution solvent: ethyl acetate) to afford the desired product (222 mg, yield 82%) as a white solid.

1. temperatureAfter the temperature was raised naturally
2. extractionfollowed by extraction with dichloromethane (60 mL)
3. washThe organic layer was washed with saturated brine
4. dry with materialsubsequently dried over anhydrous magnesium sulfate
5. distillationThe solvent was distilled off under reduced pressure
6. customthe resulting residue was purified
7. washsilica gel column chromatography (elution solvent: ethyl acetate)