Synthesis of Some New Coumarin-Quinolone Carboxylic Acids

摘要

Aminocoumarin derivatives 3-10 were condensed with diethyl ethoxymethylenemalonate to give intermediates 11-18. Thermal cyclizations of intermediates give benzopyranopyridinecarboxylates 19-26. These esters were hydrolyzed to the corresponding benzopyranopyridine carboxylic acids 27-34.