[NH2:1][C:2]1[CH:7]=[CH:6][C:5]([CH:8]([CH2:14][CH:15]([CH3:17])[CH3:16])[C:9]([O:11][CH2:12][CH3:13])=[O:10])=[CH:4][C:3]=1[O:18][CH2:19][C:20]([F:23])([F:22])[F:21].C1C(=O)N([Br:31])C(=O)C1>C(Cl)(Cl)Cl.O>[NH2:1][C:2]1[C:3]([O:18][CH2:19][C:20]([F:21])([F:22])[F:23])=[CH:4][C:5]([CH:8]([CH2:14][CH:15]([CH3:16])[CH3:17])[C:9]([O:11][CH2:12][CH3:13])=[O:10])=[CH:6][C:7]=1[Br:31]To a stirred solution of ethyl 2-(4-amino-3-(2,2,2-trifluoroethoxy)phenyl)-4-methylpentanoate (0.750 g, 2.2 mmol) in dry CHCl3 (100 mL), NBS (0.320 g, 1.8 mmol) was added at 0° C. The reaction mixture was allowed to stir for 3 h at room temperature. The reaction mixture was diluted with water, extracted with DCM (2×50 mL), the combined organic solvents was dried over Na2SO4, filtered and concentrated under reduced pressure. The crude reaction mixture was purified by column chromatography to give ethyl 2-(4-amino-3-bromo-5-(2,2,2-trifluoroethoxy)phenyl)-4-methylpentanoate (700 mg) as a yellow solid.
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