Copper-Catalyzed Synthesis of 4-Aryl-1H-1,2,3-triazoles from 1,1-Dibromoalkenes and Sodium Azide
作者:Xiaokun Wang、Chunxiang Kuang、Qing Yang
DOI:10.1002/ejoc.201101204
日期:2012.1
A new methodology for the Cu-catalyzed synthesis of 1H-1,2,3-triazoles from1,1-dibromoalkenes and sodiumazide is presented. Aryl dibromoolefins were efficiently converted into the corresponding 1,2,3-triazoles. A comprehensive number of functional groups were compatible with this reaction. 1,2,3-Triazoles were obtained in moderate to excellent yields.
tetrazoles, triazoles, and imidazolines. The magnetic silica sphere grafted sulfonic acid (MSS-SO3H) is suitable for the synthesis of 1,2,3-triazole via the cycloaddition of nitroalkene with NaN3, whereas the zinc-modified silica sphere catalyst (MSS-SO3Zn) is more suitable for the synthesis of tetrazoles. The MSS-SO3Zn catalyst also works well for the synthesis of 2-substituted imidazoline via the condensation
A one‐pot three‐component reaction of aldehydes, nitroalkanes and NaN3 for the synthesis of NH‐1,2,3‐triazoles has been developed. The reaction provides a safe, efficient and step‐economic approach for the synthesis of various NH‐1,2,3‐triazoles in good to excellent yields.
Aluminium(III) Chloride-Catalyzed Three-Component Condensation of Aromatic Aldehydes, Nitroalkanes and Sodium Azide for the Synthesis of 4-Aryl-<i>NH</i>-1,2,3-triazoles
three‐component reaction of aromatic aldehydes, nitroalkanes, and sodium azide has been developed; this reaction sequence can be applied to a broad substrate scope and affords the corresponding 4‐aryl‐NH‐1,2,3‐triazoles in good to excellent yields. The milder reaction conditions and easier operation make this AlCl3‐catalyzed protocol more advantageous for the synthesis of 4‐aryl‐NH‐1,2,3‐triazoles.