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Abstract
A capable manner for the preparation of chromeno-pyrano[2,3-b]quinoline compounds is outlined. Pyrano[3,2-c]chromene-3-carbonitriles are synthesized via the one pot three-component reaction of aryl aldehydes, malononitrile and 4-hydroxycoumarin in the presence of silica sodium carbonate (SSC) as a heterogeneous basic catalyst. Next, the prepared pyrano[3,2-c]chromene-3-carbonitrile is reacted with cyclohexanone by using silica-supported molybdic acid (SSMA) as a worthy and recyclable catalyst for producing recognized and unrecognized chromeno-pyrano[2,3-b]quinoline derivatives under solvent-free conditions in good to excellent yields.
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