Research Article
A Facile One-Pot Synthesis of Functionalized 1,5-Dihydro-2H-[1]benzopyrano[2,3-b]pyridin-5-ones
Abbas Ali Esmaeili,
Omid Ghareghani,
Abbas Ali Esmaeili
Department of Chemistry, University of Birjand, P. O. Box 97175/615, Birjand, Iran, (fax: (00 98 561) 2230009)
Search for more papers by this authorOmid Ghareghani
Department of Chemistry, University of Birjand, P. O. Box 97175/615, Birjand, Iran, (fax: (00 98 561) 2230009)
Search for more papers by this authorAbbas Ali Esmaeili,
Omid Ghareghani,
Abbas Ali Esmaeili
Department of Chemistry, University of Birjand, P. O. Box 97175/615, Birjand, Iran, (fax: (00 98 561) 2230009)
Search for more papers by this authorOmid Ghareghani
Department of Chemistry, University of Birjand, P. O. Box 97175/615, Birjand, Iran, (fax: (00 98 561) 2230009)
Search for more papers by this authorAbstract
The highly reactive 1 : 1 intermediate generated in the reaction between dialkyl acetylenedicarboxylate (=but-2-ynedioic acid dialkyl ester) 4 and triphenylphosphine was trapped by 2-amino-4-oxo-4H-1-benzopyran-3-carboxaldehydes 5 to yield highly functionalized dialkyl-1,5-dihydro-5-oxo-1-phenyl-2H-[1]benzopyrano[2,3-b]pyridine-2,3-dicarboxylates in high yield.
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