ABSTRACT
Cu(II)-β-cyclodextrin-catalyzed synthesis of spiro[indoline-3,4′-pyrano[3,2-c]chromene]-3′-carbonitriles through the reaction of isatin derivatives, 4-hydroxycoumarin, and malononitrile in ethanol at room temperature.
GRAPHICAL ABSTRACT
Acknowledgment
This paper is dedicated to the memory of our wonderful teacher in Chemistry and Medicinal Chemistry, Professor Abbas Shafiee.