Sodium Hydroxide → [(3-{[4-(2-tert-Butylphenyl)piperazin-1-yl]carbonyl}-1-methyl-1H-pyrazol-5-yl)oxy]acetic acid

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Reaction Steps

A mixture of methyl [(3-{[4-(2-tert-butylphenyl)piperazin-1-yl]carbonyl}-1-methyl-1H-pyrazol-5-yl)oxy]acetate (0.573 g, 1.38 mmol) and 1 M sodium hydroxide solution (5 mL) in tetrahydrofuran (20 mL) and methanol (20 mL) was stirred at room temperature for 3 h. Solvent was removed and 1 M hydrochloric acid solution added to the mixture. The mixture was extracted with ethyl acetate. The organic layer was washed with brine, dried over anhydrous magnesium sulfate, filtered and concentrated under reduced pressure to purify the residue by HPLC (Gilson Preparative HPLC System; column: YMC Combiprep ODS-A, S-5 μm, 50×20 mm; solvent: A; water containing 0.1% TFA, B; acetonitrile containing 0.1% TFA; gradient cycle: 0.00 min (A/B=90/10), 1.00 min (A/B=90/10), 4.20 min (A/B=10/90), 5.40 min (A/B=10/90), 5.50 min (A/B=90/10), 5.60 min (A/B=90/10); flow rate: 25 mL/min; detect: UV 220 nm). Solvent was removed to afford a solid (0.3 g, 54%).

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