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
![](/cms/asset/968faf64-7a14-47e1-87c3-c460a84bbd8f/lsyc_a_1373822_uf0001_oc.jpg)
Acknowledgment
This paper is dedicated to the memory of our wonderful teacher in Chemistry and Medicinal Chemistry, Professor Abbas Shafiee.