Hydrogen chloride-ethyl acetate → HCID 67152742, compound

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Reaction Steps

To a solution of tert-butyl [(4-fluoro-5-(2-fluoropyridin-3-yl)-1-{[3-(hydroxymethyl)phenyl]sulfonyl}-1H-pyrrol-3-yl)methyl]methylcarbamate (207 mg) in ethyl acetate (3 mL) and 2-propanol (2 mL) was added 4 mol/L hydrogen chloride-ethyl acetate solution (6 mL), and the mixture was stirred at room temperature for 2 hr. The solvent was concentrated under reduced pressure, diluted with ethyl acetate, and washed with saturated aqueous sodium hydrogen carbonate solution. The separated aqueous layer was extracted again with ethyl acetate. The combined organic layer was washed with saturated brine, dried over anhydrous magnesium sulfate, and concentrated under reduced pressure. The residue was purified by basic silica gel column chromatography (eluent: hexane-ethyl acetate=4:1→ethyl acetate:methanol=32:1) (basic TLC:Rf=0.1 (ethyl acetate)) to give a free base of the title compound as a pale-yellow oil (yield 82.6 mg). A solution of the obtained free base in ethyl acetate (1 mL) was added dropwise to a solution of fumaric acid (24 mg) in ethanol (1 mL) and the mixture was concentrated under reduced pressure. The residue was recrystallized from ethanol to give the title compound as a white solid (yield 69 mg, 36%).

Provenance & Evidence