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A facile one-pot synthesis of substituted pyridine-2,4(1H,3H)-diones from acyl(carbamoyl)ketene S,S-acetals

Yunhui Li,Wenliang Li,Rui Zhang,Yang Zhou,Dewen Dong

SYNTHESIS-STUTTGART（2008）

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Abstract
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 degrees C, a series of acyl(carbamoyl)ketene S,S-acetals were convened into the corresponding substituted pyridine-2,4(1H,3H)-diones in hi-h yields.
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Key words
annulation,N,N-dimethylformamide dimethyl acetal,Michael addition,alpha-oxoketene S,S-acetals,pyridine-2,4(1H,3H)-diones
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