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The reaction of 3-methyl-5-nitropyrimidin-4(3H)-one (1) with aliphatic and aromatic primary amines effectively afforded nitroenamines 4 having a carbamoyl group. When 1,2- diaminobenzenes were used, benzimidazoles 10 were obtained besides 4. Synthetic utility of the functionalized nitroenamines was also demonstrated in the conversion of nitroenamine 4b to polysubstituted pyridone 12.

3-Methyl-5-nitropyrimidin-4(3H)-one: An excellent precursor for functionalized nitroenamines