Citric Acid → 3-[4-({4-[(3,5-diphenyl-1H-pyrazol-1-yl)methyl]benzyl}amino)phenyl]propanoic acid

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Reaction Steps

To a solution of methyl 3-[4-({4-[(3,5-diphenyl-1H-pyrazol-1-yl)methyl]benzyl}amino)phenyl]propanoate (100 mg, 0.20 mmol) in methanol (5 mL) and tetrahydrofuran (5 mL) was added 1 M aqueous sodium hydroxide solution (2 mL), and the mixture was stirred at room temperature for 2 hr. The reaction mixture was poured into water, and the mixture was weakly acidified with 10% aqueous citric acid solution and extracted with ethyl acetate. The ethyl acetate layer was dried using a Presep Dehydration tube (manufactured by Wako Pure Chemical Industries, Ltd.), and concentrated. The residue was purified by silica gel column chromatography (20%-80% ethyl acetate/hexane) to give the title compound (75 mg, yield 77%) as colorless crystals.

Provenance & Evidence