A facile and efficient one-pot synthesis of substituted pyridine-2,4(1H,3H)-diones has been developed. Subjected to N,N-dimethylformamide dimethyl acetal (DMFDMA) in N,N-dimethylformamide at 120 ˚C, a series of acyl(carbamoyl)ketene S,S-acetals were converted into the corresponding substituted pyridine-2,4(1H,3H)-diones in high yields.
Domino Reaction of α-Acetyl-α-carbamoyl Ketene Dithioacetals with Vilsmeier Reagents: A Novel and Efficient Synthesis of 4-Halogenated 2(1<i>H</i>)-Pyridinones
A novel and efficient route to 4-halogenated N-substituted 2(1H)-pyridinones has been developed via a one-pot domino process of readily available α-acetyl-α-carbamoyl ketene dithioacetals with Vilsmeier reagents. These 4-halogenated-2(1H)-pyridinones constitute useful intermediates due to the easy elaboration on either the pyridinone core (by the displacement of the halogen atom) or functionality transformation