2,2′-Homocoupled Azine <i>N</i>
,<i>N′</i>
-Dioxides or Azine <i>N</i>
-Oxides: CDC- or S<sub>N</sub>
Ar-Controlled Chemoselectivity
作者:Abadh Kishor Jha、Nidhi Jain
DOI:10.1002/ejoc.201700504
日期:2017.9.1
efficiently with a range of N-heterocyclic oxides of pyridine, 2-phenyl pyridine, quinoline, and N-aryl-1,2,3-triazole. It is scalable, offers high regioselectivity, and gives the products in moderate to high yields. The observed chemoselectivity between copper-assisted and copper-free protocols is routed through an oxidative cross-dehydrogenative coupling (CDC), and nucleophilic aromatic substitution of
据报道,空前的Cu(OAc)2和LitOBu介导的嗪N-氧化物均质偶合生成2,2'-嗪N,N'-二氧化物。这是首次使用铜来催化均二聚反应,尤其是使用2-苯基吡啶的N-氧化物催化的情况。在没有催化铜的情况下,该反应遵循另一种途径,并且代替二氧化物而产生2,2'-嗪N-一氧化氮。该协议可与一系列N-杂环氧化物的吡啶,2-苯基吡啶,喹啉和N-芳基-1,2,3-三唑有效地协同工作。它具有可扩展性,具有很高的区域选择性,并能以中等到高产量提供产品。观察到的铜辅助方案和无铜方案之间的化学选择性是通过氧化交叉脱氢偶联(CDC)进行的,