Convergent Domino Knoevenagel Hetero-Diels-Alder and Domino Oxidation Hetero-Diels-Alder Reactions Encountered in an Unexpected Formation of Novel 5-Aryl-1H-pyrano[2,3-d]pyrimidine-2,4(3H,5H)-diones and 5-Aryl-2,3-dihydro-2-thioxo-1H-pyrano[2,3-d]pyrimidin-4(5H)-ones

[摘要]：Convergent domino Knoevenagel hetero-Diels-Alder and domino oxidation hetero-Diels-Alder reactions, in which both diene and dienophile are formed under the same reaction conditions in situ, are described for the first time, and their application is demonstrated by a one-pot synthesis of novel 5-aryl-1H-pyrano[2,3-d]pyrimidine-2,4(3H,5H)-diones and 5-aryl-2,3-dihydro-2-thioxo-1H-pyrano[2,3-d]pyrimidin-4(5H)-ones.

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