Weak<i>O</i>-Assistance Outcompeting Strong<i>N</i>,<i>N</i>-Bidentate Directing Groups in Copper-Catalyzed C−H Chalcogenation
作者:Gianpiero Cera、Lutz Ackermann
DOI:10.1002/chem.201601821
日期:2016.6.13
copper‐mediated C−H chalcogenation of triazoles has been achieved by weak coordination. The user‐friendly protocol showed high functional‐group tolerance and ample substrate scope, yielding fully substituted 1,2,3‐triazoles with complete positional site‐selectivity. The C−H selenylation could likewise be achieved by means of copper catalysis. Our findings highlight for the first time that weak O‐coordination
三唑的铜介导的CH硫族元素化是通过弱配位实现的。该用户友好型方案显示出较高的官能团耐受性和足够的底物范围,可产生具有完全位置选择性的完全取代的1,2,3-三唑。CH H硒基化同样可以通过铜催化来实现。我们的发现首次突显出弱的O配位可以胜过CH功能化技术中强大的N,N双齿配位模式。