Regioselective synthesis of [1,2,3]-triazoles catalyzed by Cu(I) generated in situ from Cu(0) nanosize activated powder and amine hydrochloride salts
作者:Hernán A. Orgueira、Demosthenes Fokas、Yuko Isome、Philip C.-M. Chan、Carmen M. Baldino
DOI:10.1016/j.tetlet.2005.02.127
日期:2005.4
A straightforward and efficient method for the regioselectivesynthesis of functionalized 1,4-disubstituted [1,2,3]-triazoles, from terminal alkynes and azides, has been established utilizing Cu(0) as the source of the catalytic species. The presumed catalytic Cu(I) species is generated by the combination of 10 mol % copper nanosize activated powder and 1 equiv of an amine hydrochloride salt. The addition
Triazole chelators, synthesized by click chemistry, are convenient ligands for palladium(II) and platinum(II). Conformational changes induced by the complexation of these Pd II and Pt II complexes with guanosine are similar to those of cisplatin. In addition, these complexes behave like cisplatin with regard to the relaxation of supercoiled plasmid DNA.
通过点击化学合成的三唑螯合剂是钯 (II) 和铂 (II) 的方便配体。这些 Pd II 和 Pt II 复合物与鸟苷的复合引起的构象变化与顺铂相似。此外,这些复合物在超螺旋质粒 DNA 的松弛方面表现得像顺铂。
An Abnormal N-Heterocyclic Carbene-Copper(I) Complex in Click Chemistry
作者:Samaresh Chandra Sau、Sudipta Raha Roy、Tamal K. Sen、Dinesh Mullangi、Swadhin K. Mandal
DOI:10.1002/adsc.201300343
日期:2013.10.11
AbstractHerein we report the synthesis of a copper(I) chloro complex using an abnormal N‐heterocyclic carbene (aNHC) salt, 1,3‐bis(2,6‐diisopropylphenyl)‐2,4‐diphenylimidazolium. The CuCl(aNHC) complex efficiently catalyzed Huisgen 1,3‐dipolar cycloaddition reactions (click reactions) of azides with alkynes to give 1,4‐substituted 1,2,3‐triazoles in excellent yields at room temperature within short reaction time under solvent‐free conditions. The catalyst successfully activated benzyl azide and phenylacetylene under the low catalyst loading of 0.005 mol% resulting in a nearly quantitative yield of the product at room temperature with the high TON value of 19,800. The catalyst also exhibits high efficiency in the reaction between sterically hindered azides and alkynes under solvent‐free conditions at room temperature. Furthermore, a number of internal alkynes was successfully tested in this copper‐catalyzed cycloaddition reaction for synthesis of 4,5‐disubstituted triazoles.magnified image