反应详情

(1R)-1-{[(4S)-2-(5-(3-{[(2S)-1-Methoxypropan-2-yl]oxy}-5-{[5-(methylsulfonyl)pyrazin-2-yl]oxy}phenyl)-1H-pyrrol-2-yl]-4,5-dihydro-1,3-oxazol-4-yl}ethanol (213 mg, 0.412 mmol) synthesized in Example (114d) was dissolved in methylene chloride (5.0 mL), and boron tribromide (1.0 mol/L methylene chloride solution, 0.80 mL, 0.80 mmol) was added dropwise at −78° C., followed by stirring at room temperature for 1.5 hours under nitrogen atmosphere. To this reaction solution, a saturated aqueous sodium hydrogencarbonate solution (10 mL) was added, and extraction was carried out with methylene chloride (20 mL). The organic layer was washed with 1N aqueous sodium hydroxide solution (10 mL), 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: methanol/methylene chloride=4%-5%) to afford the desired compound (147 mg, yield 71%) as a white solid.

1. extractionextraction
2. washThe organic layer was washed with 1N aqueous sodium hydroxide solution (10 mL)
3. dry with materialsubsequently dried over anhydrous magnesium sulfate
4. distillationThe solvent was distilled off under reduced pressure
5. customthe resulting residue was purified
6. washsilica gel column chromatography (elution solvent: methanol/methylene chloride=4%-5%)