A Further Decrease in the Catalyst Loading for the Palladium-Catalyzed Direct Intramolecular Arylation of Amides and Sulfonamides
作者:Nerea Conde、Fátima Churruca、Raul SanMartin、María Teresa Herrero、Esther Domínguez
DOI:10.1002/adsc.201401129
日期:2015.5.4
The direct arylation of N‐substituted o‐bromobenzanilides and benzenesulfonamides via CH bond functionalization has been developed using very low catalyst loadings. This novel cost‐effective and more sustainable method relies on a PCN‐type palladium pincer complex as a highly active palladium source, providing a general and efficient access to phenanthridinones, biaryl sultams and related heterocyclic
的直接芳基化Ñ取代ö -bromobenzanilides和苯磺酰胺通过Ç 已使用非常低的催化剂负载量开发了H键官能化。这种新颖的具有成本效益且更可持续的方法依赖于PCN型钯钳夹复合物作为高活性钯源,可提供对菲啶酮,联芳基杜仲和相关杂环系统的通用有效访问。在该方法中已经观察到水作为助溶剂的有益作用,其不受芳烃部分的电子作用或酰胺或磺酰胺氮上的空间上需要的取代基的严重影响。此外,为了理解所用钯配合物在该反应中的作用,已经进行了许多实验(动力学图,中毒试验,TEM,ESI)。