[CH3:1][C:2]([C:4]1[CH:9]=[CH:8][C:7](Br)=[CH:6][CH:5]=1)=[O:3].[NH:11]1[CH:15]=[N:14][CH:13]=[N:12]1.C([O-])([O-])=O.[Cs+].[Cs+]>CN(C=O)C.O.[Cu]I>[N:11]1([C:7]2[CH:8]=[CH:9][C:4]([C:2](=[O:3])[CH3:1])=[CH:5][CH:6]=2)[CH:15]=[N:14][CH:13]=[N:12]1
To a stirred solution of 4-bromoacetophenone (10 g, 50 mmol) in DMF (100 mL), were added 1,2,4-triazole (5 g, 75 mmol), Cs2CO3 (32.6 g, 100.5 mmol) and CuI (1.4 g, 10.1 mmol) and the resultant reaction mixture was refluxed for 48 h. After completion of the reaction (by TLC), the reaction mixture was cooled to RT and diluted with water (200 mL) and extracted with EtOAc. The combined organic layer was washed with brine and dried over Na2SO4 and concentrated under reduced pressure. Purification by washing with diethyl ether afforded the title compound as a solid (5 g, 96%): 1H NMR (400 MHz, CDCl3) δ 8.71 (s, 1H), 8.16, (s, 1H), 8.13 (d, J=8.6 Hz, 2H), 7.83 (d, J=8.6 Hz, 2H), 2.66 (s, 3H); ESIMS m/z 186.02 ([M−H]−).
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