C[O:2][C:3](=[O:23])[CH2:4][CH2:5][CH2:6][CH2:7][C:8]1[O:9][CH:10]=[C:11]([C:13]2[CH:18]=[CH:17][CH:16]=[CH:15][C:14]=2[C:19]([F:22])([F:21])[F:20])[N:12]=1.C1COCC1.[OH-].[Na+]>CCO>[F:21][C:19]([F:20])([F:22])[C:14]1[CH:15]=[CH:16][CH:17]=[CH:18][C:13]=1[C:11]1[N:12]=[C:8]([CH2:7][CH2:6][CH2:5][CH2:4][C:3]([OH:23])=[O:2])[O:9][CH:10]=1Combine 5-[4-(2-trifluoromethyl-phenyl)-oxazol-2-yl]-pentanoic acid methyl ester (3.35 g, 9.9 mmol) with THF (3 mL), EtOH (3 mL) and 2N NaOH (15 mL) and stir until hydrolysis is complete. Concentrate the mixture, dilute the residue with water and adjust the pH to 3.0-4.0 using aq HCl. Extract the mixture with EtOAc and dry the extracts over Na2SO4 before concentrating. Chromatograph the residue over silica gel (MeOH/CH2Cl2) to allow for recovery of 5-[4-(2-trifluoromethyl-phenyl)-oxazol-2-yl]-pentanoic acid (2.36 g, 76%). MS (ES): (M+1)+ 314.2 m/z.
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