ESR studies of nitrogen-centered free radicals. 26. Electron spin resonance spectroscopic study of new persistent nitrogen-centered free radicals: N-(arylthio)-4-toluenesulfonamidyls
Metal-free n-Et<sub>4</sub>NBr-catalyzed radical cyclization of disulfides and alkynes leading to benzothiophenes under mild conditions
作者:Daoshan Yang、Kelu Yan、Wei Wei、Laijin Tian、Qinghe Li、Jinmao You、Hua Wang
DOI:10.1039/c4ra08260e
日期:——
A novel n-Et4NBr-catalyzed method for the synthesis of benzothiophene derivatives via cascade reactions of substituted disulfides with alkynes through S–S bond cleavage and alkenyl radical cyclization reactions has been developed. The reaction has a high functional-group tolerance. The new method is environmental and practical, and the starting materials are readily available. These advantages, relative
已开发出一种新颖的n - Et 4 NBr催化方法,该方法通过取代的二硫化物与炔烃的S–S键断裂和烯基自由基环化反应的级联反应合成苯并噻吩衍生物。该反应具有较高的官能团耐受性。该新方法是环境实用的,并且起始材料容易获得。相对于先前的方法,这些优点为构建各种有用的苯并噻吩基序提供了机会。
Catalytic Oxidative C–H Annulation of Arylthiol Derivatives with 1,3-Diynes toward 3,3′-Bibenzothiophenes