Photoarylation of Pyridines Using Aryldiazonium Salts and Visible Light: An EDA Approach
作者:Aloisio de A. Bartolomeu、Rodrigo C. Silva、Timothy J. Brocksom、Timothy Noël、Kleber T. de Oliveira
DOI:10.1021/acs.joc.9b01879
日期:2019.8.16
A metal-free methodology for the photoarylation of pyridines, in water, is described giving 2 and 4-arylated-pyridines in yields up to 96%. The scope of the aryldiazonium salts is presented showing important results depending on the nature and position of the substituent group in the diazonium salt, that is, electron-donating or electron-withdrawing in the ortho, meta, or para positions. Further heteroaromatics
描述了一种用于在水中使吡啶进行光芳基化的无金属方法,该方法可产生2种和4种芳基化吡啶,产率高达96%。提出的芳基重氮盐的范围显示出重要的结果,这取决于重氮盐中取代基的性质和位置,即在邻位,间位或对位的给电子或吸电子。另外的杂芳族化合物也成功地被光芳基化。进行了机理研究以及我们的方法和类似的金属催化方法之间的比较,表明存在可见光的EDA络合物,该络合物可生成芳基,而无需其他光催化剂。