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
Synthesis of functionalized 1,2,3-triazoles using Bi<sub>2</sub>WO<sub>6</sub> nanoparticles as efficient and reusable heterogeneous catalyst in aqueous medium
The regioselective synthesis of functionalized triazoles is achieved using a combination of Bi2WO6 nanoparticles (10 mol%) and click conditions from β-nitrostyrenes, phenylacetylene and chalcones with azides.
Nickel-Catalyzed Azide–Alkyne Cycloaddition To Access 1,5-Disubstituted 1,2,3-Triazoles in Air and Water
作者:Woo Gyum Kim、Mi Eun Kang、Jae Bin Lee、Min Ho Jeon、Sungmin Lee、Jungha Lee、Bongseo Choi、Pedro M. S. D. Cal、Sebyung Kang、Jung-Min Kee、Gonçalo J. L. Bernardes、Jan-Uwe Rohde、Wonyoung Choe、Sung You Hong
DOI:10.1021/jacs.7b06338
日期:2017.9.6
Herein, we report a method to access 1,5-disubstituted 1,2,3-triazoles using a Cp2Ni/Xantphos catalytic system. The reaction proceeds both in water and organic solvents at room temperature. This protocol is simple and scalable with a broad substrate scope including both aliphatic and aromatic substrates. Moreover, triazoles attached with carbohydrates or amino acids are prepared via this cycloaddition
the presence of a catalytic amount of Ce(OTf)3, both benzyl and phenyl azides react with a broad range of aryl nitroolefins containing a range of functionalities selectively producing 1,5-disubstituted1,2,3-triazoles in good to excellent yields.
A magnetically separable ruthenium catalyst was synthesized through immobilizing a pentamethylcyclopentadienyl ruthenium complex on iron oxide nanoparticles. The catalyst is highly active and selective for the synthesis of 1,5-disubstituted 1,2,3-trizoles via cycloaddition of alkynes and organic azides and can be recycled at least 5 times.