Synthesis of Unsymmetrical Diorganyl Chalcogenides under Greener Conditions: Use of an Iodine/DMSO System, Solvent- and Metal-Free Approach
作者:Sumbal Saba、Jamal Rafique、Antonio L. Braga
DOI:10.1002/adsc.201500024
日期:2015.5.4
Herein, we report a greeneriodine‐catalyzed protocol to access different types of unsymmetricaldiorganylchalcogenides. This new approach works in the absence of solvent and metal. The desired products were obtained in good to excellent yields using one equivalent of arylboronic acids, half an equivalent of various diorganyl dichalcogenides, iodine (10 mol%) as a catalyst and 2 equivalents of dimethyl
Solvent selective phenyl selenylation and phenyl tellurylation of aryl boronic acids catalyzed by Cu(II) grafted functionalized polystyrene
作者:Susmita Roy、Tanmay Chatterjee、Sk. Manirul Islam
DOI:10.1016/j.tetlet.2014.12.055
日期:2015.2
A solvent-selective methodology for the phenyl selenylation and phenyl tellurylation of aryl boronic acids has been developed for the first time using a polymer supported Cu(II) catalyst. The catalyst was synthesized by anchoring Cu(OAc)(2) onto a functionalized polystyrene with pyridine thiosemicarbazone ligand. It was then characterized properly by SEM, EDAX, FT-IR, TGA, and EPR experiments. The catalyst smoothly catalyzes phenyl selenylation of aryl boronic acids in water and phenyl tellurylation of aryl boronic acids in PEG-600, selectively. Thus a wide variety of unsymmetrical organodiaryl or aryl-heteroaryl selenides and tellurides have been synthesized by this protocol. The catalyst was recycled up to six runs without any appreciable loss of catalytic activity. (C) 2014 Elsevier Ltd. All rights reserved.
Synthesis of symmetrical and unsymmetrical tellurides <i>via</i> silver catalysis
作者:Bruna Goldani、Manoela do Sacramento、Eder J. Lenardão、Ricardo F. Schumacher、Thiago Barcellos、Diego Alves
DOI:10.1039/c8nj01998c
日期:——
cross-coupling reaction of diaryl ditellurides with aryl boronic acids catalyzed by AgNO3. The general applicability and wide substrate scope make this an interesting method for the synthesis of a series of symmetrical and unsymmetrical diaryl tellurides. This silver-catalyzed protocol tolerates a variety of diaryl ditellurides as well as aryl boronic acids by using only 10 mol% of AgNO3 to provide the desired
我们在这里描述了一种简单有效的方法,用于二芳基二碲化物与AgNO 3催化的芳基硼酸的交叉偶联反应。通用性和广泛的底物范围使该方法成为合成一系列对称和不对称二芳基碲化物的有趣方法。该银催化的方案通过仅使用10 mol%的AgNO 3来耐受多种二芳基二碲化物和芳基硼酸,从而以高收率提供所需的产物。通过高分辨率质谱分析提出了该反应机理,并可以检测出活性的(PhTe)2 Ag III中间体。