arylation and aroylation of coumarins with glyoxals in a metal-free manner is presented. The aryl glyoxal is for the first time recognized to serve as an aryl surrogate in addition to its role as an aroyl transfer reagent via a simple switch in reaction conditions. The approach accommodates a broad substrate scope and high yields of the two types of cross-coupling reactions starting from identical starting
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