Regioselective synthesis of functionalized 1,2,3-triazoles via oxidative [3+2]-cycloaddition using Zn(OAc)2 - tBuOOH or ZnO nanoparticle as catalyst system in aqueous medium
The regioselective synthesis of functionalized pyrazole˗1,2,3-triazoles is reported viaoxidative [3 + 2]-cycloaddition reactions of azides with β-nitrostyrenes and chalcone derivatives using Zn(OAc)2 - tBuOOH or ZnO nanoparticles as catalyst system in aqueous medium. The catalyst dependent product selectivity was observed with β-nitrostyrenes to give the triazoles with and without -NO2 group Zn(OAc)2
Copper-Catalyzed [3 + 2] Cycloaddition/Oxidation Reactions between Nitro-olefins and Organic Azides: Highly Regioselective Synthesis of NO<sub>2</sub>-Substituted 1,2,3-Triazoles
作者:Yunfeng Chen、Gang Nie、Qi Zhang、Shan Ma、Huan Li、Qinquan Hu
DOI:10.1021/ol503687w
日期:2015.3.6
A new copper-catalyzed [3 + 2] cycloaddition/oxidation reaction of nitro-olefins with organic azides has been developed to afford 1,4(-NO2),5-trisubstituted 1,2,3-triazoles. This reaction sequence has a broad substrate scope and affords NO2-substituted 1,2,3-triazoles with high regioselectivities and in good to excellent yields. The involved oxidative process overcomes the elimination of HNO2 for general
A tunable route to oxidative and eliminative [3+2] cycloadditions of organic azides with nitroolefins: CuO nanoparticles catalyzed synthesis of 1,2,3-triazoles under solvent-free condition
作者:D. Gangaprasad、J. Paul Raj、T. Kiranmye、R. Sasikala、K. Karthikeyan、S. Kutti Rani、J. Elangovan
DOI:10.1016/j.tetlet.2016.06.004
日期:2016.7
A regioselective and tunable synthesis of 1,5-disubstituted 1,2,3-triazloles from oxidative and eliminative [3+2] cycloadditions of nitroolefins and organic azides under solvent-free condition in the presence and absence of commercially available CuO nanoparticle catalyst is described. In the presence of the catalyst under solvent-free condition, nitro group is retained in the product while it gets eliminated in the absence of the catalyst. (C) 2016 Elsevier Ltd. All rights reserved.
Mechanochemical Access to Functional Clickates with Nitro-Retentive Selectivity via Organocatalyzed Oxidative Azide-Olefin Cycloaddition
作者:Murugan Vadivelu、Abbasriyaludeen Abdul Raheem、John Paul Raj、Jebamalai Elangovan、Kesavan Karthikeyan、Chandrasekar Praveen