1-Bromo-2-butanone → 2,3-Dihydro-3-ethylcarbonylmethyl-4-methyl-2-oxo-1-pyrid-3-ylmethyleneamino-1H-imidazole

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Reaction Steps

0.72 g of sodium hydride are added to a suspension of 4.1 g of 2,3-dihydro-4-methyl-2-oxo-1-pyrid-3-ylmethyleneamino-1H-imidazole in 80 ml of N,N-dimethylformamide. The mixture is heated to 50°, treated with a solution of 3.78 g of 1-bromo-2-oxo-butane in 20 ml of N,N-dimethylformamide, and stirred for 30 minutes. The N,N-dimethylformamide is then removed on a rotary evaporator. In a mixer, the residue is mixed intimately with water. The crystals are filtered off, yielding the title compound melting at 183°-184°.

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