[C:1]([C:4]1[CH:5]=[C:6]([CH:9]=[CH:10][CH:11]=1)[C:7]#[N:8])(=[O:3])[CH3:2].BrBr.[CH3:14][C:15]1[NH:16][CH:17]=[CH:18][N:19]=1>O1CCOCC1.C(#N)C>[CH3:14][C:15]1[N:16]([CH2:2][C:1]([C:4]2[CH:5]=[C:6]([CH:9]=[CH:10][CH:11]=2)[C:7]#[N:8])=[O:3])[CH:17]=[CH:18][N:19]=13-acetylbenzonitrile (50 g, 0.345 mol) is dissolved in dioxane (600 ml) with stirring at room temperature, bromine (17.7 ml, 0.345 mol) is added in and the mixture is stirred for 30 minutes. The dioxane is removed in vacuo to give a solid which is dissolved in acetonitrile (300 ml). 2-Methylimidazole (28.3 g, 0.345 mol) is added to the solution and the mixture is stirred for 1 hour, the temperature of the mixture rising to 45° C. The precipated solid is filtered off, washed with acetonitrile, and slurried with methanol for 1 hour. After filtering to remove undissolved solid, the filtrate is evaporated in vacuo to leave a solid which is dried in vacuo at 40° C. to give the title compound, m.s. 369 (MH+).
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