[NH2:1][C:2]1[CH:3]=[C:4]2[C:10](=[CH:11][CH:12]=1)[CH:9]1[CH2:13][CH2:14][CH:5]2[CH2:6][N:7]([C:15](=[O:20])[C:16]([F:19])([F:18])[F:17])[CH2:8]1.C1C(=O)N([Br:28])C(=O)C1>C(Cl)Cl.C(O)(=O)C>[NH2:1][C:2]1[C:3]([Br:28])=[C:4]2[C:10](=[CH:11][CH:12]=1)[CH:9]1[CH2:13][CH2:14][CH:5]2[CH2:6][N:7]([C:15](=[O:20])[C:16]([F:19])([F:17])[F:18])[CH2:8]11-(4-Amino-10-aza-tricyclo[6.3.2.0*2,7*]trideca-2,4,6-trien-10-yl)-2,2,2-trifluoro-ethanone (20 mg, 0.0204 mmol) was placed in CH2Cl2 (3 mL) and acetic acid (0.1 mL). NBS was added. The reaction was stirred for 30 min. and then concentrated under reduced pressure. Purification by silica gel chromatography using a gradient of 0-8% MeOH/CH2Cl2 as the eluting solvent to obtain 1-(4-amino-3-bromo-10-aza-tricyclo[6.3.2.0*2,7*]trideca-2,4,6-trien-10-yl)-2,2,2-trifluoro-ethanone as a yellow film (14.82 mg, 58%). LCMS (m/e) 363 (M+1); 1H-NMR (CDCl3, 400 MHz) δ 7.18 (d, 1H, J=10.6 Hz), 6.57 (d, 1H, J=8.34 Hz), 4.25-4.10 (m, 1H), 4.03 (bs, 2H), 3.90-3.78 (m, 1H), 3.50-3.40 (m, 1H), 3.40-3.26 (m, 1H), 3.12-3.00 (m, 2H), 2.30-1.90 (m, 2H), 1.80-1.65 (m, 2H).
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