Dimethylformamide → 5-(3-Dimethylaminoprop-2-en-1-oyl)-1,2-dimethylimidazole

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Reaction Steps

2-Methyl-4-acetylimidazole (Tetrahedron letters 1985, 26 (29), 3423-3426; 129 g, 1.04 mol) was dissolved in a mixture of DMF (900 ml) and DMF.DMA (1.51) and the mixture heated under reflux, under an atmosphere of nitrogen, for 18 hours. The reaction mixture was allowed to cool to ambient temperature the product crystallised. The solid product was collected by filtration, washed with DMF.DMA and then ether and dried under vacuum at 40° C. to give the title compound (115 g, 57%) as a pale brown crystalline solid. NMR: 2.13 (s, 3H), 2.95 (s, 6H), 3.78 (s, 3H), 5.56 (d, 1H), 7.50 (d, 1H), 7.53 (s, 1H); m/z 194.

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