Atom-economical selenation of electron-rich arenes and phosphonates with molecular oxygen at room temperature
作者:Samir Kumar Bhunia、Pritha Das、Ranjan Jana
DOI:10.1039/c8ob02792g
日期:——
An environmentally benign selenation of electron-rich arenes and phosphonates is developed adopting a novel recycle–reuse–reduce strategy for selenol by oxygen.
一种采用新颖的循环-重复利用-减少策略,通过氧气对富电子芳烃和膦酸酯进行环保的硒化反应被开发出来。
Direct, Metal-free C(sp<sup>2</sup>
)−H Chalcogenation of Indoles and Imidazopyridines with Dichalcogenides Catalysed by KIO<sub>3</sub>
作者:Jamal Rafique、Sumbal Saba、Marcelo S. Franco、Luana Bettanin、Alex R. Schneider、Lais T. Silva、Antonio L. Braga
DOI:10.1002/chem.201705404
日期:2018.3.15
synthesis of 3‐Se/S‐indoles and imidazo[1,2‐a]pyridines through direct C(sp2)−H bond chalcogenation of heteroarenes with half molar equivalents of different dichalcogenides, using KIO3 as a non‐toxic, easy‐to‐handle catalyst and a stoichiometric amount of glycerol. The reaction features are high yields, based on atom economy, easy performance on gram‐scale, metal‐ and solvent‐free conditions as well as applicability
本文中,我们报告了一种更环保的协议,该方法通过杂芳烃的直接C(sp 2)-H键硫代半数当量的不同二硫代半乳糖苷合成3-Se / S-吲哚和咪唑并[1,2- a ]吡啶KIO 3是一种无毒,易于操作的催化剂和化学计量的甘油。该反应的特征是基于原子经济性的高收率,在克级,无金属和无溶剂条件下易于操作以及适用于不同类型的N-杂芳烃。
A Solvent- and Metal-Free Synthesis of 3-Chacogenyl-indoles Employing DMSO/I<sub>2</sub> as an Eco-friendly Catalytic Oxidation System
作者:Juliano B. Azeredo、Marcelo Godoi、Guilherme M. Martins、Claudio C. Silveira、Antonio L. Braga
DOI:10.1021/jo5000779
日期:2014.5.2
Herein, we describe a solvent- and metal-free method for the synthesis of 3-chalcogenyl-indoles from indoles and diorganyl dichalcogenides using an equivalent amount of DMSO as an oxidant, under catalysis by molecular iodine. This mild and eco-friendly approach allowed the preparation of a wide range of 3-selenyl- and 3-sulfenyl-indoles in good to excellent yields.
Fe(III)-Catalyzed direct C3 chalcogenylation of indole: The effect of iodide ions
作者:Eduardo Q. Luz、Diego Seckler、Janylson Souza Araújo、Leonardo Angst、David B. Lima、Elise Ane Maluf Rios、Ronny R. Ribeiro、Daniel S. Rampon
DOI:10.1016/j.tet.2019.01.037
日期:2019.3
iron (III)-catalyzed C3 chalcogenylation of indoles has been developed and the role of the iodide ions in this transformation was investigated. EPR experiments revealed the reduction of Fe(III) to Fe(II) under the reaction conditions, supporting the formation of molecular iodine in the system, which in effect catalyze the reaction. The scope of the chalcogenylation was broad and the synthesis of more
Rose Bengal catalysed photo-induced selenylation of indoles, imidazoles and arenes: a metal free approach
作者:Sumbal Saba、Jamal Rafique、Marcelo S. Franco、Alex R. Schneider、Leandro Espíndola、Dagoberto O. Silva、Antonio L. Braga
DOI:10.1039/c7ob03177g
日期:——
In this report, the highly efficient Rose Bengal-catalysed C(sp2)–H selenylation of indoles, imidazoles and arenes was achieved using a half molar equiv. of diorganoyl diselenides. This metal-free, photo-induced protocol resulted in selenylated products in good to excellent yields. The reaction features are high yields, an atom-economic, gram-scalable and metal-free approach, and applicability to different