Sodium Hydroxide → 2-[3-(4-fluorophenyl)-1-(2-hydroxyethyl)-4-(4-pyridinyl)-1H-pyrazol-5-yl]cyclopropanecarboxylic acid

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Reaction Steps

To a solution of ethyl 2-[3-(4-fluorophenyl)-1-(2-hydroxyethyl)-4-(4-pyridinyl)-1H-pyrazol-5-yl]cyclopropanecarboxylate prepared in accordance with Example A-196 (0.21 g, 0.00045 mol) in 10 mL of methanol was added a solution of sodium hydroxide (0.09 g, 0.0022 mol) in 2 mL of water. The reaction mixture was stirred at reflux for 6 hours. After the solvent was removed, the residue was dissolved with 10 mL of 1N HCl and stirred for 30 minutes. The pH was then adjusted to 5–6 by addition of 1N sodium hydroxide solution and then extracted with ethyl acetate. The organic layer was washed with brine, dried over magnesium and filtered. The filtrate was concentrated and the crude was purified by recrystallization from ethanol and ether to give 0.1 g of product, 2-[3-(4-fluorophenyl)-1-(2-hydroxyethyl)-4-(4-pyridinyl)-1H-pyrazol-5-yl]cyclopropanecarboxylic acid, as a white solid (60% yield), mp: 253–255° C.; 1H NMR (CD3OD): δ 8.46 (m, 2H), 7.32 (m, 2H), 7.25 (m, 2H), 7.04 (m, 2H), 4.39 (t, J=5.0 Hz, 2H), 4.03 (m, 2H), 2.60 (m, 1H), 1.51 (m, 2H), 0.97 (m, 2H); Anal. Calc'd For C20H18FN3O3: C, 65.39; H, 4.94; N, 11.44. Found: C, 64.92; H, 4.77; N, 11.20.

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