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.
A Novel Synthesis of Allyl Sulfides and Allyl Selenides via Sm–BiCl3 System in Aqueous Media
作者:Zhuangping Zhan、Genliang Lu、Yongmin Zhang
DOI:10.1039/a807256f
日期:——
Allyl sulfides and allyl selenides are synthesized via the reaction of allyl bromide with disulfides and diselenides promoted by the SmâBiCl3 system in aqueous media in moderate to good yields.
A Novel Synthesis of Allyl and Prop-2-ynyl Selenides Promoted by Tin in the Presence of Water†
作者:Puhong Liao、Weiliang Bao、Yongmin Zhang
DOI:10.1039/a704857b
日期:——
Allylic and prop-2-ynyl (propargyl) bromides react with diorganyl diselenides in the presence of water to give allylic and prop-2-ynyl selenides in moderate to good yields; the reaction rate is faster than for the same reaction in anhydrous organic media.
Rhodium-catalyzed cascade reactions of triazoles with organoselenium compounds – a combined experimental and mechanistic study
作者:Fang Li、Chao Pei、Rene M. Koenigs
DOI:10.1039/d1sc00495f
日期:——
our studies on the reaction of organoselenium compounds with triazoles under thermal conditions using simple Rh(II) catalysts. These reactions do not provide the product of classic rearrangement reactions. Instead two different cascade reactions were uncovered. While allyl selenides react in a cascade of sigmatropic rearrangement and selenium-mediated radical cyclizationreaction to give dihydropyrroles
Al<sub>2</sub>O<sub>3</sub>-Supported Cu-Catalyzed Electrophilic Substitution by PhSeBr in Organoboranes, Organosilanes, and Organostannanes. A Protocol for the Synthesis of Unsymmetrical Diaryl and Alkyl Aryl Selenides
作者:Sukalyan Bhadra、Amit Saha、Brindaban C. Ranu
DOI:10.1021/jo100755g
日期:2010.7.16
Alumina-supported copper sulfate efficiently catalyzes electrophilic substitution in organoborane, organosilanes, and organostannanes by phenylselenium bromide providing a novel and efficient route to the synthesis of unsymmetrical diaryl and alkyl aryl selenides. A series of aryl, alkyl, and heteroaryl phenyl selenides were obtained in high yields. The catalyst is inexpensive, eco- and user-friendly