Lithium Hydroxide → 1-(6-Chloro-5-(cyclopropylmethoxy)-4'-(trifluoromethyl)biphenyl-3-yl)cyclopentane carboxylic acid

Ethyl 1-(6-chloro-5-(cyclopropylmethoxy)-4′-(trifluoromethyl)biphenyl-3-yl)cyclopentanecarboxylate (80 mg) dissolved in 10 mL of MeOH/THF/H2O (10 mL/10 mL/5 mL) and 57 mg LiOH added. The reaction mixture was stirred at room temperature for 5 h and concentrated under reduced pressure. Water (10 mL) was added and the reaction mixture was extracted with EtOAc (3×10 mL). The combined organic phases were dried over MgSO4, filtered and concentrated under reduced pressure. Purification by column chromatography over silica gel (hexane/EtOAc 9:1) gave 1-(6-chloro-5-(cyclopropylmethoxy)-4′-(trifluoromethyl)biphenyl-3-yl)cyclopentane carboxylic acid (45 mg) as a white solid. 1H-NMR (500 MHz, CDCl3): 7.68 (d, 2H), 7.55 (d, 2H), 6.99 (s, 1H), 6.97 (s, 1H), 3.97 (d, 2H), 2.64 (m, 2H), 1.95 (m, 2H), 1.77 (m, 4H), 1.21 (m, 1H), 0.45 (m, 2H), 0.18 (m, 2H);