作者:Fehmi Damkaci、Abdulkhaliq Alawaed、Erik Vik
DOI:10.1016/j.tetlet.2016.04.017
日期:2016.5
N-phenyl-2-pyridincarboxamide-1-oxide as a ligand with Cu2O in Ullmann type CN bond formations between aryl halides and N-heteroaryls in common solvents, such as MeCN, DMF, and DMSO at 82–120 °C has been successfully demonstrated. The ligand is effective when only 4% equiv is used relative to the substrate. The reaction provided the corresponding products in coupling of electron-rich, electron poor, and
使用N-苯基-2-吡啶甲酰胺-1-氧化物作为Cu 2 O的配体,在普通溶剂(例如MeCN,DMF和DMSO)中于82- ℃下在芳基卤化物和N-杂芳基之间的Ullmann C型N键形成中120°C已被成功证明。当相对于底物仅使用4%当量时,配体是有效的。该反应以良好或非常好的收率提供了富电子,电子贫乏和邻位取代的芳基卤化物(包括邻位芳基氯化物)偶联的相应产物。当邻位时,在苄基位置选择性地优选N-芳基化-卤化物苄基溴化物与一当量的吡唑反应。然而,当使用2.5当量的吡唑时,以非常高的产率实现二-N-芳基化,从而提供了对偶联反应的化学计量控制。