Triphenylphosphine Oxide → 2-(5-{3-[(1S)-2-Methoxy-1-methylethoxy]-5-[4-(methylsulfonyl)phenoxy]phenyl}-1H-pyrrol-2-yl)-4,5-dihydro-1,3-thiazole

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Reaction Steps

Triphenylphosphine oxide (2.41 g, 8.7 mmol) was dissolved in dichloromethane (20 mL), and trifluoromethanesulfonic anhydride (0.73 mL, 4.3 mmol) was added dropwise slowly at 0° C. After stirring for 10 minutes, a dichloromethane (15 mL) solution of 5-{3-[(1S)-2-methoxy-1-methylethoxy]-5-[4-(methylsulfonyl)phenoxy]phenyl}-N[2-(tritylthio)ethyl]-1H-pyrrole-2-carboxamide synthesized in Example (25b) was added. After reaction solution was stirred at room temperature for 30 minutes, the solvent was distilled off under reduced pressure, a saturated aqueous sodium hydrogencarbonate solution was added, and extraction was carried out with ethyl acetate (200 mL). The organic layer was washed with saturated brine, and 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/hexane=50%-80%) to afford the desired product (636 mg, yield 90%) as a white solid.

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