[CH3:1][C:2]1[NH:3][CH:4]=[CH:5][N:6]=1.F[C:8]1[CH:18]=[CH:17][C:11]([C:12]([O:14][CH2:15][CH3:16])=[O:13])=[CH:10][CH:9]=1.C(=O)([O-])[O-].[K+].[K+]>CS(C)=O>[CH3:1][C:2]1[N:3]([C:8]2[CH:18]=[CH:17][C:11]([C:12]([O:14][CH2:15][CH3:16])=[O:13])=[CH:10][CH:9]=2)[CH:4]=[CH:5][N:6]=1A mixture of 2-methylimidazole (50 g, 0.6 mol), ethyl 4-fluorobenzoate (100 g, 0.6 mol) and potassium carbonate (415 g, 3 mol) in dry DMSO (1.5 l ) was heated at 120° C. for 66 hours under a nitrogen atmosphere. After cooling to room temperature, the reaction mixture was poured into ice-cold water (1 l ), and extracted with Et2O (750 ml×2). The organic phase was washed with water (500 ml) and brine (500 ml), dried over MgSO4 and evaporated. The residual solid was recrystallized from ethyl acetate-hexane to give the titled compound (47 g, 33%) as yellow needles.
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