Boron tribromide → (2S)-2-(3-[5-(4,5-Dihydro-1,3-oxazol-2-yl)-1H-pyrrol-2-yl]-5-{[6-(methylsulfonyl)pyridin-3-yl]oxy}phenoxy)propan-1-ol

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Reaction Steps

5-{3-[5-(4,5-Dihydro-1,3-oxazol-2-yl)-1H-pyrrol-2-yl]-5-[(1S)-2-methoxy-1-methylethoxy]phenoxy}-2-(methylsulfonyl)pyridine (230 mg, 0.49 mmol) synthesized in Example (78l) was dissolved in methylene chloride (10 mL), and boron tribromide (1.0 mol/L methylene chloride solution, 0.75 mL, 0.75 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 ammonium chloride solution (20 mL) was added, and extraction was carried out with methylene chloride (20 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: methanol/methylene chloride=2%-4%) to afford the desired compound (170 mg, yield 76%) as a white solid.

Provenance & Evidence