FC(F)(F)C(O)=O.[Cl:8][C:9]1[CH:26]=[CH:25][C:12]([O:13][CH2:14][C@@H:15]([NH:17]C(=O)OC(C)(C)C)[CH3:16])=[C:11]([C:27]([CH3:33])([CH3:32])[C:28]([F:31])([F:30])[F:29])[CH:10]=1.[OH-].[Na+]>ClCCl>[Cl:8][C:9]1[CH:26]=[CH:25][C:12]([O:13][CH2:14][C@@H:15]([NH2:17])[CH3:16])=[C:11]([C:27]([CH3:32])([CH3:33])[C:28]([F:29])([F:30])[F:31])[CH:10]=1Trifluoroacetic acid (5 mL) was added to a solution of tert-butyl {(2S)-1-[4-chloro-2-(1,1,1-trifluoro-2-methylpropan-2-yl)phenoxy]propan-2-yl}carbamate (C49) (600 mg, 1.52 mmol) in dichloromethane (24 mL), and the reaction mixture was stirred for 30 minutes. Aqueous sodium hydroxide solution (1 M, 50 mL) was added, and the mixture was extracted with diethyl ether (3×50 mL). The combined organic layers were dried over magnesium sulfate, filtered, and concentrated in vacuo to afford the product as a light amber oil, which was used without further purification. Yield: 433 mg, 1.46 mmol, 96%. LCMS m/z 296.1, 298.1 (M+1). 1H NMR (400 MHz, CDCl3) δ 1.24 (d, J=6.4 Hz, 3H), 1.67 (br s, 6H), 2.13 (br s, 2H), 3.41-3.50 (m, 1H), 3.79 (dd, half of ABX pattern, J=8.8, 7.2 Hz, 1H), 3.86 (dd, half of ABX pattern, J=8.9, 4.4 Hz, 1H), 6.86 (d, J=8.8 Hz, 1H), 7.23 (dd, J=8.8, 2.5 Hz, 1H), 7.36-7.39 (m, 1H).
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