Abstract
A facile, efficient, three-component reaction of 2,3,4,9-tetrahydro-1H-carbazol-1-one, malononitrile, and aromatic/heteroaromatic aldehydes in dimethylformamide (DMF) gave pyrano[2,3-a]carbazoles in good yields, at reflux condition, using a catalytic amount of piperidine.
GRAPHICAL ABSTRACT
ACKNOWLEDGMENTS
The authors thank the Indian Institute of Science, Bangalore, for NMR data and the Indian Institute of Chemical Technology, Hyderabad, for mass spectral data.
SUPPLEMENTAL MATERIAL
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