[CH3:1][C:2]1[CH:3]=[C:4]([C:9](=[O:25])[CH2:10][C:11]2[CH:16]=[CH:15][N:14]=[C:13]([O:17][CH2:18][C:19]3[CH:24]=[CH:23][CH:22]=[CH:21][CH:20]=3)[CH:12]=2)[CH:5]=[C:6]([CH3:8])[CH:7]=1.[Br:26]Br>C(O)(=O)C>[BrH:26].[Br:26][CH:10]([C:11]1[CH:16]=[CH:15][N:14]=[C:13]([O:17][CH2:18][C:19]2[CH:20]=[CH:21][CH:22]=[CH:23][CH:24]=2)[CH:12]=1)[C:9]([C:4]1[CH:3]=[C:2]([CH3:1])[CH:7]=[C:6]([CH3:8])[CH:5]=1)=[O:25]1-(3,5-Dimethylphenyl)-2-(2-phenylmethyloxy-4-pyridyl)ethanone (3.3 g, 10 mmol) was dissolved in acetic acid (10 mL) and bromine (0.51 mL, 10 mmol) was added to the solution and stirred at room temperature for 30 minutes. The precipitated crude crystals were collected by filtration and washed with diethyl ether to obtain 4.8 g of the title compound (9.8 mmol, yield 98%).
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