Copper nanoparticles on activated carbon have been found to effectively catalyze the multicomponent synthesis of 1,2,3-triazoles from different azide precursors, such as organic halides, diazonium salts, anilines and epoxides in water. The first one-pot transformation of an olefin into a triazole is also described. The catalyst is easy to prepare, very versatile and reusable at a low copper loading
An easy-to-prepare, reusable and versatile catalyst consisting of oxidised copper nanoparticles on activated carbon has been fully characterised and found to effectively promote the multicomponent synthesis of 1,2,3-triazoles from organic halides, diazonium salts, and aromatic amines in water at a low copper loading.
Phosphoramidite accelerated copper(i)-catalyzed [3 + 2] cycloadditions of azides and alkynes
作者:Lachlan S. Campbell-Verduyn、Leila Mirfeizi、Rudi A. Dierckx、Philip H. Elsinga、Ben L. Feringa
DOI:10.1039/b822994e
日期:——
Monodentate phosphoramidite ligands are used to accelerate the copper(i)-catalyzed 1,3-dipolar cycloaddition of azides and alkynes (CuAAC) rapidly yielding a wide variety of functionalized 1,4-disubstituted-1,2,3-triazoles; Cu(i) and Cu(ii) salts both function as the copper source in aqueous solution to provide excellent yields.
Ultrasound promoted facile one pot synthesis of triazole derivatives catalyzed by functionalized graphene oxide Cu(I) complex under mild conditions
作者:Hossein Naeimi、Rahele Shaabani
DOI:10.1016/j.ultsonch.2016.05.043
日期:2017.1
A facile onepot three component reaction of alkyl halides, sodium azide with terminal alkynes can be catalyzed by functionalized graphene oxide copper (I) complex under ultrasonic irradiation at room temperature. In this protocol, the 1,4-disubstituted 1,2,3-triazoles were afforded as target pure products in excellent yields and short reaction times. The prepared catalyst has been characterized by
‘Click’ ligand for ‘click’ chemistry: (1-(4-methoxybenzyl)-1-H-1,2,3-triazol-4-yl)methanol (MBHTM) accelerated copper-catalyzed [3+2] azide–alkyne cycloaddition (CuAAC) at low catalyst loading
作者:Rajesh H. Tale、Venkatesh B. Gopula、Gopal K. Toradmal
DOI:10.1016/j.tetlet.2015.09.010
日期:2015.10
1,2,3-triazol-4-yl)methanol (MBHTM) synthesized itself by ‘click’ chemistry shown to promote the dramatic rate enhancement of copper catalyze azide–alkyne cycloaddition (CuAAC) at lowcatalystloading to give diverse 1,4-disustituted 1,2,3-triazoles in high to excellent yields under mild conditions. Using higher catalyst and ligand loading, excellent and 49% yield of the corresponding 1,2,3 triazole
易于获得,具有成本效益,非常稳定且易于调节的基于1,2,3-三唑的配体,(1-(4-甲氧基苄基)-1 - H -1,2,3-三唑-4-基)甲醇(MBHTM)通过“点击”化学反应自行合成的结果表明,在低催化剂负载量下,铜催化叠氮化物-炔烃环加成反应(CuAAC)的速率大大提高,在温和的条件下,可以高产率或优异产率得到各种1,4-废弃的1,2,3-三唑情况。使用较高的催化剂和配体负载量,分别在不到一个小时和几分钟的时间内即可获得相应的1,2,3三唑产物优异的收率和49%的收率,这表明该反应可用于开发快速“点击”反应协议。