[C:1]([C:5]1[CH:14]=[CH:13][C:8]([C:9]([O:11]C)=[O:10])=[C:7]([O:15][C:16]2[CH:21]=[CH:20][CH:19]=[C:18]([C:22]([F:25])([F:24])[F:23])[N:17]=2)[CH:6]=1)([CH3:4])([CH3:3])[CH3:2].O.[OH-].[Li+].Cl>C1COCC1.O>[C:1]([C:5]1[CH:14]=[CH:13][C:8]([C:9]([OH:11])=[O:10])=[C:7]([O:15][C:16]2[CH:21]=[CH:20][CH:19]=[C:18]([C:22]([F:25])([F:23])[F:24])[N:17]=2)[CH:6]=1)([CH3:4])([CH3:2])[CH3:3]A mixture of methyl 4-tert-butyl-2-(6-(trifluoromethyl)pyridin-2-yloxy)benzoate (0.49 g, 1.4 mmol) and lithium hydroxide hydrate (0.12 g, 2.8 mmol) in THF (5 mL) and water (5 mL) was stirred at room temperature for two days. The reaction was made acidic with 1 M HCl(aq) and extracted with ethyl acetate. The combined extracts were washed with water, dried over sodium sulfate, and evaporated to give 4-tert-butyl-2-(6-(trifluoromethyl)pyridin-2-yloxy)benzoic acid (0.45 g, 95% yield). LC/MS: m/z 340.5 (M+H)+ at 1.89 min (10%-99% CH3CN (0.035% TFA)/H2O (0.05% TFA)). 1H NMR (400 MHz, CDCl3) δ 8.00 (d, J=8.3 Hz, 1H), 7.85-7.81 (m, 1H), 7.36-7.33 (m, 2H), 7.26-7.24 (m, 1H), 7.09 (d, J=8.4 Hz, 1H) and 1.34 (s, 9H) ppm.
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