Abstract
The rhodium(III)-catalyzed annulative coupling of coumarin-3-carboxylic acids, prepared easily by condensation of salicylaldehydes with Meldrum’s acid, with alkynes proceeds smoothly through carboxy-directed C4–H bond cleavage. These procedures provide ready access to variously substituted pyrano[3,4-c]chromene-4,5-dione derivatives from readily available starting materials. Keywords: annulation; rhodium catalyst; C–H bond cleavage; fused coumarins
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