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Metal-free catalytic cascade to chromones: direct coupling of salicylaldehydes and activated alkynes triggered by aryloxyl radicals†
Zhongfeng Li,Shengli Cao,Honghua Rao
RSC Advances Pub Date : 12/03/2015 00:00:00 , DOI:10.1039/C5RA24634B
Abstract

The first intermolecular addition reaction of aryloxyl radicals to C[triple bond, length as m-dash]C bonds was disclosed, which can afford biologically important chromone scaffolds via a PhNMe3I-catalyzed direct coupling of readily available salicylaldehydes and activated internal alkynes in only one step, and can tolerate a range of catalytically reactive functional groups.

Graphical abstract: Metal-free catalytic cascade to chromones: direct coupling of salicylaldehydes and activated alkynes triggered by aryloxyl radicals
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