C[O:2][C:3](=[O:20])[CH:4]([C:11]1[CH:16]=[CH:15][C:14]([S:17][CH3:18])=[C:13]([Cl:19])[CH:12]=1)[CH2:5][CH:6]1[CH2:10][CH2:9][CH2:8][CH2:7]1.[OH-].[K+]>C(O)C.O>[Cl:19][C:13]1[CH:12]=[C:11]([CH:4]([CH2:5][CH:6]2[CH2:10][CH2:9][CH2:8][CH2:7]2)[C:3]([OH:20])=[O:2])[CH:16]=[CH:15][C:14]=1[S:17][CH3:18]A solution of 2-(3-chloro-4-methylsulfanyl-phenyl)-3-cyclopentyl-propionic acid methyl ester (4.85 g, 15.50 mol) in ethanol (108 mL) was treated with a solution of potassium hydroxide (4.35 g, 77.50 mmol) in water (25.2 mL). The reaction mixture was stirred at 25° C. for 3 h. The reaction mixture was then concentrated in vacuo to remove ethanol. The resulting aqueous residue was acidified to pH=2 with a 1N aqueous hydrochloric acid solution and then extracted with methylene chloride (3×15 mL). The combined organic layers were then dried over sodium sulfate, filtered, and concentrated in vacuo to afford 2-(3-chloro-4-methylsulfanyl-phenyl)-3-cyclopentyl-propionic acid (4.14 g, 89.4%) as a white solid which was used without further purification.
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