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

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Reaction Conditions

Reaction Steps

t-Butyl 2-{3-[(1S)-2-methoxy-1-methylethoxy]-5-[4-(methylsulfonyl)phenoxy]phenyl}-5-(1,3-thiazol-2-yl)-1H-pyrrole-1-carboxylate (7.16 g, 12.2 mmol) synthesized in Example (1h) was dissolved in dichloromethane (15 mL), and cooled to 0° C. Trifluoroacetic acid (30 mL) was added dropwise with stirring under nitrogen atmosphere. Stirring was carried out at room temperature for 30 minutes, followed by further stirring at 40° C. for 30 minutes. The solvent was distilled off under reduced pressure followed by dilution with ethyl acetate (300 mL), a saturated aqueous sodium hydrogencarbonate solution (200 mL) was added, and the solution was separated. The organic layer was washed with saturated brine, and subsequently dried over sodium 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=30%-50%) to afford the desired compound (5.21 g, yield 88%) as a pale yellow solid.

Provenance & Evidence