Air promoted annulation of thiophenols with alkynes leading to benzothiophenes
作者:Yajun Wang、Rui Wu、Shijun Zhao、Zhengjun Quan、Yingpeng Su、Congde Huo
DOI:10.1039/c8ob00010g
日期:——
Air promoted intermolecular annulation of thiophenols with alkynes, leading to complex benzothiophenes, is reported.
空气促进了硫酚与炔烃的分子间环化反应,形成复杂的苯并噻吩化合物。
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。
synthon, have been applied to the synthesis of 12aH-benzo[f]pyrido[1,2-d][1,4]thiazepines and benzo[b]thiophenes. Benzopyridothiazepines were produced through a 1,5-dipolar cycloaddition reaction from pyridinium 1,4-zwitterionic thiolates with arynes, whereas benzothiophenes as side products were generated via a [3 + 2] cascade cyclization reaction. The [5 + 2] reaction mode of pyridinium 1,4-zwitterionic
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.