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。
Visible-light-induced synthesis of benzothiophenes and benzoselenophenes via the annulation of thiophenols or 1,2-diphenyldiselane with alkynes
作者:Xiao-Feng Xia、Guo-Wei Zhang、Su-Li Zhu
DOI:10.1016/j.tet.2017.03.053
日期:2017.5
An effective metal-free photoredox-mediated tandem addition/cyclization reaction of thiophenols or 1,2-diphenyldiselane with alkynes leads to 2,3-disubstituted benzothiophenes and benzoselenophenes. Blue light irradiation of the organic dye, Mes-Acr-Me+, initiates the photoredox catalysis. A series of functional groups could be tolerated under ambient conditions, and good to excellent yields were generated. (C) 2017 Elsevier Ltd. All rights reserved.
Direct Benzothiophene Formation via Oxygen-Triggered Intermolecular Cyclization of Thiophenols and Alkynes Assisted by Manganese/PhCOOH
作者:Kaisheng Liu、Fan Jia、Hui Xi、Yuanming Li、Xiaojian Zheng、Qiaoxia Guo、Baojian Shen、Zhiping Li
DOI:10.1021/ol400719d
日期:2013.4.19
An intermolecular oxidative cyclization between thiophenols and alkynes for benzothiophene formation has been established. A variety of multifunctional benzothiophenes are synthesized. In addition, we demonstrated that the obtained benzothiophenes can be used for further transformation to give diverse benzothiophene derivatives efficiently and selectively.