Abstract
2-{[(5-Hydroxy-2-oxo-2H-chromen-4-yl)methyl]sulfanyl}pyridine-3-carbonitrile derivatives were synthesized in a reaction of 4-chloromethyl-5-hydroxycoumarin with substituted 2-thioxopyridine-3-carbonitriles. The presence in the molecule of spatially adjacent active methylene, nitrile, and hydroxyl groups under the action of a base leads to consecutive intramolecular cyclization reactions with the formation of a novel heterocyclic system pyrano[4″,3″,2″:4′,5′]chromeno[2′,3′:4,5]thieno[2,3-b]pyridine.
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