the generality of gold versus silver catalyzed intramolecular hydroarylation reactions of 3-[(3-arylprop-2-ynyl)oxy]benzenederivatives in terms of rings substitution were investigated. Only products deriving from 6-endo cyclization were exclusively formed. The features of substituents had a considerable effect on the reaction outcome in the presence of silver catalysis, whereas gold catalysis revealed
Synthesis of 3‐Organoselenyl‐2
<i>H</i>
‐Coumarins from Propargylic Aryl Ethers via Oxidative Radical Cyclization
作者:Jun‐Dan Fang、Xiao‐Biao Yan、Li Zhou、Yu‐Zhao Wang、Xue‐Yuan Liu
DOI:10.1002/adsc.201801565
日期:2019.4.23
A metal‐free oxidative radical cyclization/selenylation of propargylic arylethers with diaryl diselenides was developed. This protocol provided an alternative method to synthesize 3‐organoselenyl‐2H‐coumarins via the formation of C−Se bond, C−C bond, and C=O bond in one step. Moreover, a broad range of functional groups (such as halogen, aldehyde, ketone, cyano, and nitro group) were tolerated.