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0 °C

6-Methoxy-3-(trifluoroacetyl)-2,3,4,5-tetrahydro-1H-3-benzazepine (11.5 g, 42.0 mmol) was dissolved in CH2Cl2 (200 mL) and cooled to 0° C. under nitrogen. Boron tribromide (10.0 mL, 0.105 mol) was added via syringe, and the solution was stirred at room temperature for 16 hours. Saturated ammonium chloride was added slowly with stirring over 2 hours. Additional CH2Cl2 was added and the solution was partitioned between CH2Cl2 and water. The resulting mixture was concentrated and repartitioned between ethyl acetate and H2O. The organic layer was concentrated to give a white solid. Crystallization from EtOAc/hexane gave 9.95 g (91%) of the title compound as a white crystalline solid: mp 183–186° C.; 1H NMR (400 MHz, DMSO-d6) δ 6.93 (dt, J=2, 8 Hz, 1 H), 6.71 (dd, J=4, 8 Hz, 1 H), 6.61 (t, J=6 Hz, 1 H), 3.68–3.60 (m, 4 H), 3.00–2.88 (m, 4 H); IR (diffuse reflectance) 3311, 1671, 1466, 1375, 1337, 1313, 1277, 1217, 1199, 1175, 1160, 1147, 949, 785, 739 cm31 1; MS (EI) m/z 259 (M+); Anal. Calcd for C12H12F3N O2: C, 55.60; H, 4.67; N, 5.40; F, 21.99. Found: C, 55.24; H, 4.75; N, 5.36.

1. stirringwith stirring over 2 hours
2. customthe solution was partitioned between CH2Cl2 and water
3. concentrationThe resulting mixture was concentrated
4. concentrationThe organic layer was concentrated
5. customto give a white solid
6. customCrystallization from EtOAc/hexane