Diacylation of coumarins by silver-catalyzed decarboxylative cross-coupling
作者:Hua Wang、Shi-Liu Zhou、Li-Na Guo、Xin-Hua Duan
DOI:10.1016/j.tet.2014.12.029
日期:2015.1
A mild silver-catalyzeddecarboxylative acylation of coumarins has been developed by using α-oxocarboxylicacids as acyl sources. This protocol provides an efficient and straightforward access to aroyl substituted coumarins in moderate to excellent yields with good selectivities. Furthermore, the reaction conditions were also applicable to quinolinones and naphthoquinones, affording the corresponding
Metal-free catalytic cascade to chromones: direct coupling of salicylaldehydes and activated alkynes triggered by aryloxyl radicals
作者:Ping Wang、Zhongfeng Li、Shengli Cao、Honghua Rao
DOI:10.1039/c5ra24634b
日期:——
The first intermolecular addition reaction of aryloxylradicals to CC 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.