Lithium Hydroxide → 2-(4-(1-(4-(trifluoromethoxy)phenyl)-1H-1,2,4-triazol-3-yl)phenyl)acetic acid

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To a 100 mL round bottomed flask, equipped with a magnetic stir bar, was added methyl 2-(4-(1-(4-(trifluoromethoxy)phenyl)-1H-1,2,4-triazol-3-yl)phenyl)acetate (C3) (3.45 g, 9.14 mmol) and lithium hydroxide.hydrate (1.15 g, 27.4 mmol) as solids. These solids were diluted with tetrahydrofuran (24 mL), methanol (24 mL), and water (12 mL). The reaction was stirred at room temperature for 2 hours. The reaction mixture was then concentrated to dryness. The resulting solid was then diluted with water, and the resulting suspension was adjusted to pH 2.9. The subsequent precipitate was extracted with ethyl acetate (5×100 mL). The combined organic extracts were dried over anhydrous magnesium sulfate, filtered, and concentrated to afford the title compound as a white solid (3.27 g, 96%): 1H NMR (400 MHz, DMSO-d6) δ 12.41 (s, 1H), 9.40 (s, 1H), 8.15-8.03 (m, 4H), 7.63 (dq, J=7.9, 1.0 Hz, 2H), 7.49-7.36 (m, 2H), 3.66 (s, 2H); 19F NMR (376 MHz, DMSO-d6) δ −56.98; ESIMS m/z 364 ([M+H]+).

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