A One-Pot Synthesis of the 1-Benzopyrano[2,3-b]pyridine Moiety from 2-(Alkyl/arylamino)-4-oxo-4H-1-Benzopyran-3-Carbaldehyde

[摘要]：2-(Alkyl/arylamino)chromone-3-carbaldehyde reacts with Meldrum's acid, hippuric acid, 4-hydroxy-coumarin, diethyl malonate, ethyl acetoacetate, or ethyl benzoylacetate to produce 1-benzopyrano[2,3b]pyridine-2,5-dione moiety, but ethyl cyanoacetate and malononitrile react differently.

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