A one-pot protocol for the synthesis of 1,2,3-triazoles has been developed starting from inactivated alkenes and based on two click reactions: the azidosulfenylation of the carbon–carbon double bond and the copper-catalyzed azide–alkyne cycloaddition (CuAAC). High yields of the β-methylsulfanyl triazoles have been attained using CuNPs/C as catalyst, with other commercial copper catalysts being completely
A new method was developed to synthesize N2-alkyl-substituted 1,2,3-triazoles via gold catalyzed alkylation of vinylethers with mono- and unsubstituted NH-1,2,3-triazoles and benzotriazole. A hydrogen bond between the oxygen atom of the vinylethers, activated via the gold catalyst, and the NH-1,2,3-triazoles was supposed to be generated, which selectively gave the N2-alkylation products.
Organocatalytic Vinyl Azide-Carbonyl [3+2] Cycloaddition: High-Yielding Synthesis of Fully Decorated<i>N</i>-Vinyl-1,2,3-Triazoles
作者:Dhevalapally B. Ramachary、G. Surendra Reddy、Swamy Peraka、Jagjeet Gujral
DOI:10.1002/cctc.201601317
日期:2017.1.23
For the first time, an enolate‐mediated organocatalytic vinyl azide‐carbonyl [3+2] cycloaddition (OrgVACC) of various ketones/aldehydes with vinyl azides is reported. It is an efficient intermolecular reaction with excellent outcomes with reference to rate, yield, selectivity, operational simplicity, substrate scope, catalyst simplicity, and vast applications.
An efficient new method was developed to selectively synthesize N1-vinyl substituted 1,2,3-triazoles via gold catalyzed alkenylation of 1-sulfonyl-1,2,3-triazoles with alkynes.
开发了一种高效的新方法,通过金催化的烯烃化反应,选择性合成N1-乙烯基取代的1,2,3-三唑。
Effect of Resonance on the Clickability of Alkenyl Azides in the Strain-promoted Cycloaddition with Dibenzo-fused Cyclooctynes
The clickabilities of various alkenyl and alkyl azides in the strain-promoted cycloaddition with dibenzo-fused cyclooctynes were investigated. Although alkenyl azides generally exhibited lower clickabilities than those of alkyl azides, a sterically-hindered alkenyl azide showed high reactivity comparable with those of alkyl azides. Theoretical analyses indicated that these unique reactivities are derived from the frontier molecular orbital interactions and distortability of the azido groups.