ChemInform Abstract: Fused Polycyclic Nitrogen-Containing Heterocycles. Part 24. Three-Component Condensation of Diethyl 2,4,6-Trioxoheptanedicarboxylate with Salicylaldehydes and Ammonium Acetate as a New Method for the Synthesis of 7- and 9-Substituted Benzo[e]pyrano[4,3-b]pyridines.

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