Methanesulfonic Acid → (5S)-5-Ethyl-2-[5-(3-{[(2S)-1-methoxypropan-2-yl]oxy}-5-[(tripropan-2-ylsilyl)oxy]phenyl)-1H-pyrrol-2-yl]-4,5-dihydro-1,3-oxazole

Participants

Reaction Conditions

Reaction Steps

N-[(2R)-2-Hydroxybutyl]-5-(3-{[(2S)-1-methoxypropan-2-yl]oxy}-5-[(tripropan-2-ylsilyl)oxy]phenyl)-1H-pyrrole-2-carboxamide (1.01 g, 1.95 mmol) synthesized in Example (106d) was dissolved in tetrahydrofuran (40 mL), and anhydrous methanesulfonic acid (600 mg, 3.44 mmol) and triethylamine (1.60 mL, 11.48 mmol) were added, followed by stirring at 50° C. for 8 hours under nitrogen atmosphere. To the reaction solution, a saturated aqueous ammonium chloride solution (50 mL) was added, and extraction was carried out with methylene chloride (80 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/hexane=50%-70%) to afford the desired compound (980 mg, yield 100%) as a yellow solid.

Provenance & Evidence