Cuprous oxide on charcoal-catalyzed ligand-free, synthesis of 1,4-disubstituted 1,2,3-triazoles via click chemistry
作者:Susana Rojas-Lima、Heraclio López-Ruiz、José Emilio de la Cerda-Pedro、Susana Rojas-Lima、Imelda Pérez-Pérez、Brianda Viridiana Rodríguez-Sánchez、Rosa Santillán、Oscar Coreño
DOI:10.3998/ark.5550190.0014.312
日期:——
Cuprous oxide on charcoal (Cu2O/C), the preparation of which is described for the first time, catalyzes the formation of 1,4-disubstituted 1,2,3-triazoles from organic azides and terminalalkynes in good to excellent yields (69-94%). These disubstituted triazoles can be equally efficiently generated in a one-pot process from alkyl bromides, sodiumazide, and terminal acetylenes in 50% aqueous isopropanol
Heterogeneous Copper Catalyst for the Cycloaddition of Azides and Alkynes without Additives under Ambient Conditions
作者:In Soo Park、Min Serk Kwon、Youngkwon Kim、Jae Sung Lee、Jaiwook Park
DOI:10.1021/ol702790w
日期:2008.2.1
A new copper catalyst was developed by immobilizing copper nanoparticles in aluminum oxyhydoxide fiber. The catalyst showed high catalytic activity for the (3+2) Huisgencycloaddition of nonactivated alkynes as well as activated ones with various azides at room temperature. The catalyst was recycled five times without significant loss of activity.
Conventional and microwave assisted synthesis of 1,4-disubstituted 1,2,3-triazoles from Huisgen cycloaddition
作者:Juan Ignacio Sarmiento-Sanchez、Adrian Ochoa-Teran、Ignacio A. Rivero
DOI:10.3998/ark.5550190.0012.913
日期:——
In this paper the synthesis of a library of new 1,4-disubstituted1,2,3-triazoles 1, with a variety of additional functional groups on its structure, from an in situ generated benzyl azide 2 and different alkynes and dialkynes 3 is reported. Optimal experimental conditions were established for the conventional click chemistry and for the microwave-assisted synthesis of these 1,2,3triazoles. Comparing
Heterogeneous Copper Nanocatalyst and Manufacturing Methods Thereof
申请人:Park Jai Wook
公开号:US20110172417A1
公开(公告)日:2011-07-14
This invention relates to a heterogeneous copper nanocatalyst composed of copper nanoparticles immobilized on a boehmite support, a method of preparing the same, and the use thereof. The copper nanocatalyst composed of the copper nanoparticles supported on boehmite exhibits excellent performance in a Huisgen cycloaddition reaction and an A3 coupling reaction of aldehyde, amine and alkyne. The copper nanocatalyst is able to be prepared in a large scale and shows superior reactivity even when used in a small amount under mild conditions without an additive in an organic reaction. This heterogeneous catalyst is easy to separate and reuse after the reaction.
Photoredox Catalysis at Copper(II) on Chitosan: Application to Photolatent CuAAC
作者:Oumayma Jennah、Redouane Beniazza、Cédric Lozach、Damien Jardel、Florian Molton、Carole Duboc、Thierry Buffeteau、Abdelkrim El Kadib、Dominique Lastécouères、Mohammed Lahcini、Jean-Marc Vincent
DOI:10.1002/adsc.201800964
日期:2018.12.3
In this article we report the first example of a heterogeneous photolatent catalyst for the copper‐catalyzedazide‐alkynecycloaddition (CuAAC) that is supported on chitosan. The heterogeneous copper(II) precatalyst was easily prepared by reaction of [CuII2(3‐benzoylbenzoate)4(H2O)2] complex 1 with chitosan powder. UV‐vis and EPR spectroscopy studies demonstrated that the Cu(II) ions are effectively
在本文中,我们报告了壳聚糖负载的铜催化的叠氮化物-炔烃环加成反应(CuAAC)的非均相光潜催化剂的第一个示例。通过使[Cu II 2(3-苯甲酰基苯甲酸酯)4(H 2 O)2 ]配合物1与壳聚糖粉末反应,可以轻松制备多相铜(II)预催化剂。UV-vis和EPR光谱研究表明,低强度UVA可有效地将Cu(II)离子光还原。特别地,已表明二苯甲酮光敏剂可以催化量使用,即1。e。相对于Cu 2+为10摩尔%离子,以有效地促进Cu(II)到Cu(I)的光还原过程。可以在光照和无抗坏血酸钠的条件下有效地合成一系列三唑,尤其是那些带有糖部分的三唑。ICP分析没有显示出最终产品中的铜污染,从而证明了壳聚糖粉末上铜的紧密结合。由于其非均相性质,催化剂可以被回收并重复使用几次,而催化活性没有明显降低。该方法的实际应用是在10 mmol规模的合成中以82%的收率分离出抗惊厥药rufinamide。