Synthesis of 4, 10??dihydro??4, 10??dioxo??1H??[1]??benzopyrano [3, 2??b] pyridine, 4, 5??Dihydro??4, 5??dioxo??1H??[1]??benzopyrano [2, 3–6] pyridine and 1, 5??Dihydro??1, 5?? …

…, PA Young, M Von Strandtmann

Index: Connor, David T.; Young, Patricia A.; Strandtmann, Maximilian von Journal of Heterocyclic Chemistry, 1981 , vol. 18, p. 697 - 702

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Citation Number: 12

Abstract

Abstract 3-Aminochromone and 3-aminocoumarin were condensed with diethyl ethoxymethylenemalonate and with dimethyl acetylenedicarboxylate to give intermediates, which were thermally cyclized to give 4, 10-dihydro-4, 10-dioxo-lH-[1]-benzopyrano [3, 2-b] pyridinecarboxylates and 1, 5-dihydro-1, 5-dioxo-4H-[1]-benzopyrano-[3, 4-b] pyridinecarboxylates. 2-Aminochromone was converted to 4, 5-dihydro-4, 5-dioxo-1H-[1]- ...