A general and green procedure for the synthesis of organochalcogenides by CuFe<sub>2</sub>O<sub>4</sub>nanoparticle catalysed coupling of organoboronic acids and dichalcogenides in PEG-400
作者:Debasish Kundu、Nirmalya Mukherjee、Brindaban C. Ranu
DOI:10.1039/c2ra22415a
日期:——
A general and efficient procedure has been developed for the synthesis of organochalcogenides (selenides and tellurides) by a simple reaction of organoboronic acids and dichalcogenides catalysed by CuFe2O4 nanoparticles in PEG-400 without any ligand. This protocol offers the scope for access to a wide spectrum of chalcogenides including diaryl, aryl–heteroaryl, aryl–styrenyl, aryl–alkenyl, aryl–allyl, aryl–alkyl and aryl–alkynyl versions. The catalyst is magnetically separable and recyclable eight times without any loss of appreciable catalytic activity. The products are obtained in high purities after evaporation of solvent followed by filtration column chromatography.
New arylselanylpyrazole-copper catalysts: Highly efficient catalytic system for C Se and C S coupling reactions
作者:Felipe Lange Coelho、Lucielle Codeim Dresch、Rafael Stieler、Leandra Franciscato Campo、Paulo Henrique Schneider
DOI:10.1016/j.catcom.2018.12.009
日期:2019.3
CSe and CS couplingreactions. The performance of these complexes for CSe reactions was investigated in chalcogenoacetylene synthesis. The reactions were carried out under mild and aerobic conditions and afforded selanylalkynes bearing a variety of electron-withdrawing and electron-donating groups. The performance of these catalysts for CS coupling was investigated through the reaction of aryl halides
Alkynyl Sulfonium Salts Can Be Employed as Chalcogen‐Bonding Catalysts and Generate Alkynyl Radicals under Blue‐Light Irradiation
作者:Yu Lu、Qiang Liu、Zhi‐Xiang Wang、Xiang‐Yu Chen
DOI:10.1002/anie.202116071
日期:2022.4.11
Alkynyl sulfonium salts were employed as chalcogen bonding (ChB) catalysts for the first time. They display superior capability in the generation of alkynyl radicals under blue-light irradiation.
Chalcogenoacetylenes Obtained by Indium(III) Catalysis: Dual Catalytic Activation of Diorgano Dichalcogenides and Csp-H Bonds
作者:Daniel S. Rampon、Rodrigo Giovenardi、Tiago L. Silva、Raoní S. Rambo、Aloir A. Merlo、Paulo H. Schneider
DOI:10.1002/ejoc.201101245
日期:2011.12
A new approach for the one-pot synthesis of alkynyl chalcogenides, exemplified mainly by selenides, was developed in which dualactivation of diorganodichalcogenides and terminal acetylenes is achieved by using an indium(III) catalyst. The method has advantages of broad substrate scope, simple operation, mild reaction conditions, and good yields. A plausible reaction mechanism is proposed.
An efficient synthesis of alkynyl selenides and tellurides from terminal acetylenes and diorganyl diselenides or ditellurides catalyzed by recyclable copper oxide nanopowder
作者:Marcelo Godoi、Eduardo W. Ricardo、Tiago E. Frizon、Manuela S.T. Rocha、Devender Singh、Márcio W. Paixão、Antonio Luiz Braga
DOI:10.1016/j.tet.2012.08.086
日期:2012.12
Herein, we report an efficient method for the synthesis of alkynyl selenides and tellurides from terminal alkynes and diorganyl diselenides or ditellurides using CuO nanopowder as a recyclable catalyst. This new methodology furnished the desired products in good to excellent yields. Furthermore, the catalyst was easily recovered and reused for further catalytic reactions without loss of activity.