C[O:2][C:3]1[CH:4]=[C:5]([NH2:13])[CH:6]=[C:7]([C:9]([F:12])([F:11])[F:10])[CH:8]=1.Br.C(O)(=O)C>O>[NH2:13][C:5]1[CH:4]=[C:3]([OH:2])[CH:8]=[C:7]([C:9]([F:10])([F:11])[F:12])[CH:6]=1To a round bottom flask was added 3-methoxy-5-trifluoromethyl-phenylamine (1.0 g, 5.23 mmol), 10 mL HBr (49% aq.), and 8 mL glacial acetic acid. A reflux condenser was attached and the solution heated to 140° C. for 20 h. The reaction was then diluted with water and neutralized to ˜pH 7 by slow addition of saturated NaHCO2. The aqueous solution was then extracted into EtOAc twice. The organic layers were combined, washed once with brine, dried over Mg2SO4, filtered, and concentrated in vacuo to yield the title compound as a tan solid (750 mg). MS (M+H)+=178; Calc'd 177.12 for C7H6F3NO.
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