Lithium Hydroxide → 2-(2-(4-Cyclopentyl-3-(trifluoromethyl)benzyloxy)-6,7,8,9-tetrahydropyrido[1,2-a]indol-9-yl)acetic Acid

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To a solution of ethyl 2-(2-(4-cyclopentyl-3-(trifluoromethyl)benzyloxy)-6,7,8,9-tetrahydropyrido[1,2-a]indol-9-yl)acetate (143 mg, 0.286 mmol) in dioxane (1.5 mL) was added 1 M LiOH aqueous solution (1.15 mL, 1.145 mmol). The reaction mixture was stirred at 45° C. for 3 h. A portion of the solvent was removed in vacuo. The remaining mixture was diluted with water, acidified with 0.5 M aqueous citric acid to pH 4, and extracted with ethyl acetate. The combined organics were washed with water, dried over anhydrous Na2SO4, and concentrated to give the title compound (105 mg). LCMS m/z=472.3 [M+H]+; 1H NMR (400 MHz, CDCl3) δ ppm 1.54-1.66 (m, 3H), 1.67-1.80 (m, 2H), 1.80-1.92 (m, 2H), 2.00-2.24 (m, 5H), 2.64 (dd, J=16.1 and 8.7 Hz, 1H), 3.01 (dd, J=16.1 and 5.3 Hz, 1H), 3.33-3.42 (m, 1H), 3.45-3.55 (m, 1H), 3.85-3.94 (m, 1H), 4.12-4.18 (m, 1H), 5.08 (s, 2H), 6.22 (s, 1H), 6.90 (dd, J=8.8 and 2.4 Hz, 1H), 7.10 (d, J=2.4 Hz, 1H), 7.17 (d, J=8.8 Hz, 1H), 7.47 (d, J=8.1 Hz, 1H), 7.59 (d, J=8.1 Hz, 1H), 7.70 (s, 1H).

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