Keywords
chromeno[2,3-b]pyridines
chromones
heterocyclization
nucleophilic reactions
pyrano[3,2-c]chromenes
pyrano[3′,4′:5,6]pyrano[2,3-b]chromenes
triacetic acid lactone
Abstract
Reaction of 3-formylchromones and triacetic acid lactone proceeds with retention of the chromone skeleton and cyclization into pyrano[3′,4′:5,6]pyrano[2,3-b]chromene system. The crystal structure of the reaction product from unsubstituted 3-formylchromone has been determined from X-ray data. Other chromone analogues bearing CO2H, CO2Me and CN substituents react with triacetic acid lactone affording an o-hydroxychalcone heteroanalogue, pyrano[3,2-c]chromene and chromeno[2,3-b]pyridine derivatives, respectively.
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