摘要 描述了一种通过Cu(I)催化的乙烯基硒化物的环化反应获得2-芳基硒基苯并[ b ]硫属元素衍生物的有效方案。关键的乙烯基硒化物可以容易地由适当官能化的1,1-二溴苯乙烯制备,并且该方法允许以中等至优异的产率合成2-芳基硒基呋喃,-噻吩和-硒代苯。 描述了一种通过Cu(I)催化的乙烯基硒化物的环化反应获得2-芳基硒基苯并[ b ]硫属元素衍生物的有效方案。关键的乙烯基硒化物可以容易地由适当官能化的1,1-二溴苯乙烯制备,并且该方法允许以中等至优异的产率合成2-芳基硒基呋喃,-噻吩和-硒代苯。
Synthesis of 2-selenyl(sulfenyl)benzofurans via Cu-catalyzed tandem reactions of 2-(gem-dibromovinyl)phenols with diorganyl diselenides(disulfides)
作者:Jie Liu、Wei Chen、Lei Wang
DOI:10.1039/c3ra23361h
日期:——
An efficient synthesis of 2-selenyl(sulfenyl)benzofurans has been accomplished through a copper(I)-catalyzed tandem reaction of 2-(gem-dibromovinyl)phenols with diorganyl diselenides and disulfides in the presence of CuI/Mg/t-BuOLi in DMSO. Using this protocol, a variety of 2-selenyl(sulfenyl)benzofuran derivatives were obtained in good yields.
UVA Light‐promoted Catalyst‐free Cyclization of Vinyl Selenides: Green and Efficient Synthesis of C3‐Unsubstituted 2‐Selanyl Benzochalcogenophenes
作者:Gelson Perin、Thiago J. Peglow、Filipe Penteado、Patrick C. Nobre、Krigor B. Silva、Guilherme Stach、Thiago Barcellos、Eder J. Lenardão、Juliano A. Roehrs
DOI:10.1002/asia.202101394
日期:2022.4.14
An environmentally friendly protocol to prepare selenium-containing benzo[b]chalcogenophenes by photocyclization of o-chalcogen-substituted selanylalkenes using UVA irradiation is presented.
Electrochemical Generation of Aryl Radicals from Organoboron Reagents Enabled by Pulsed Electrosynthesis
作者:Maxime Boudjelel、Jessica Zhong、Lorenzo Ballerini、Ian Vanswearingen、Rossul Al‐Dhufari、Christian A. Malapit
DOI:10.1002/anie.202406203
日期:2024.7.29
Pulsed electrosynthesis efficiently converts aromatic organoboron reagents to aryl radicals. Mechanistic studies reveal that pulsed electrosynthesis overcomes challenges like radical grafting/passivation, homocoupling, overoxidation, and decomposition. This electro-oxidative method enables straightforward functionalization of aromatic organoboron reagents to form aryl C−P, C−Se, C−Te, and C−S bonds
A convenient and efficient copper-catalyzed synthesis of unsymmetrical and symmetrical diaryl chalcogenides from arylboronic acids in ethanol at room temperature
作者:Amit Kumar、Sangit Kumar
DOI:10.1016/j.tet.2014.01.030
日期:2014.3
A simple and convenient approach for the synthesis of unsymmetrical diaryl chalcogenides (Te, Se, and S) has been developed by copper-catalyzed cross-coupling reaction of organoboronic acid with diaryl dichalcogenide in ethanol using NaBH4 in air or oxygen. The present methodology is highly practical for the synthesis of unsymmetrical diaryl tellurides with various functionalities such as -NO2, -F, -Br, and -COOH that have been obtained in good to excellent yields. Methodology is also effective for the synthesis of unsymmetrical diaryl selenides and sulfides. Moreover, symmetrical diaryl selenides have also been obtained from arylboronic acids using elemental selenium powder under optimized reaction conditions. The use of NaBH4 is the key for the development of milder reaction conditions, which enable the construction of unsymmetrical diaryl chalcogenides from boronic acid substrates in ethanol at room temperature. (C) 2014 Elsevier Ltd. All rights reserved.
Copper-catalyzed C–Se coupling of diphenyl diselenide with arylboronic acids at room temperature
作者:Bo Zheng、Ying Gong、Hua-Jian Xu
DOI:10.1016/j.tet.2013.04.124
日期:2013.7
An efficient synthetic protocol for the Cu-catalyzed cross-coupling of diphenyl diselenide and arylboronic acid at room temperature was described. This catalytic system could tolerate a variety of arylboronic acids with only 3 mol % amount of CuSO4 as the catalyst and inexpensive 1,10-phen. H2O as the ligand. Moreover, this catalytic system used environment-friendly EtOH as the solvent and catalytic amount of Na2CO3 (20 mol %) as the base in the air. (C) 2013 Elsevier Ltd. All rights reserved.