Palladium-catalyzed alkynylselenation of acetylenedicarboxylates leading to enyne selenides and application to synthesis of multisubstituted aryl selenides
摘要:
Upon treatment of a mixture of alkynyl selenides and acetylenedicarboxylates with Pd(OAc)(2)/P(o-tol)(3)/K2CO3/H2O-catalytic system, the alkynylselenation of acetylenedicarboxylates takes place to give the corresponding alkynylvinyl selenides. Furthermore, alkynyl selenides undergo the intermolecular [2+2+2] cycloaddition reaction in the presence of PdCl2(PPh3)(2) as a catalyst, affording the corresponding multisubstituted aryl selenides selectively.(C) 2010 Elsevier Ltd. All rights reserved.
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 sulfides and selenides from alkynyl bromides and diorganoyl chalcogenides promoted by copper(I) iodide
作者:Antonio L. Braga、Aurélia Reckziegel、Paulo H. Menezes、Hélio A. Stefani
DOI:10.1016/0040-4039(93)85084-a
日期:1993.1
Alkynyl sulfides and selenides were obtained in good yields by reacting alkynyl bromides with diorganoyl disulfides and diselenides in hexamethylphosphoric triamide (HMPA) in the presence of copper (I) iodide.
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 and general procedure for the synthesis of alkynyl chalcogenides (selenides and tellurides) by alumina-supported Cu(II)-catalyzed reaction of alkynyl bromides and diphenyl dichalcogenides
作者:Sabir Ahammed、Sukalyan Bhadra、Debasish Kundu、Bojja Sreedhar、Brindaban C. Ranu
DOI:10.1016/j.tet.2012.08.046
日期:2012.12
catalyzes the reaction of alkynyl bromides and diphenyldiselenides and ditellurides in presence of Zn dust or indium(I) bromide to provide the corresponding alkynyl selenides and tellurides. The reactions of a wide variety of substituted alkynyl bromides have been addressed. The zinc dust or InBr is required for the cleavage of diphenylselenides/tellurides. The mechanism of the reaction is established
在锌粉或溴化铟(I)的存在下,氧化铝(Al 2 O 3)负载的铜(II)有效催化炔基溴化物与二苯基二硒化物和二碲化物的反应,从而提供相应的炔基硒化物和碲化物。已经解决了多种取代的炔基溴的反应。裂解二苯硒化物/碲化物需要锌粉或InBr。建立了反应机理。产品的产率很高,并且催化剂被回收。
Cryptand-22 as an efficient ligand for the copper-catalyzed cross-coupling reaction of diorgano dichalcogenides with terminal alkynes leading to the synthesis of alkynyl chalcogenides
作者:Elmira Mohammadi、Barahman Movassagh
DOI:10.1016/j.tetlet.2014.01.088
日期:2014.2
A general and efficient method for the cross-coupling reaction of diorgano dichalcogenides with terminal alkynes using copper iodide/cryptand-22 (CuI/C22) has been developed. This protocol gave allcynyl chalcogenides in moderate to excellent yields in the presence of K3PO4 as the base under aerobic conditions. (C) 2014 Elsevier Ltd. All rights reserved.