Intramolecular hydrogen bonding-assisted cyclocondensation of α-diazoketones with various amines: a strategy for highly efficient Wolff 1,2,3-triazole synthesis
A catalytic and highly efficient Wolff's cyclocondensation of α-diazoketones with aromatic and aliphatic amines has been realized for the first time by utilizing the strategy of an intramolecular hydrogen bonding-activating carbonyl group. This approach successfully solved the challenging problem of poor condensation efficiency in Wolff 1,2,3-triazole synthesis, and constitutes a powerful method for the synthesis of highly functionalized 1,2,3-triazoles.
Sonochemistry in organocatalytic enamine-azide [3+2] cycloadditions: A rapid alternative for the synthesis of 1,2,3-triazoyl carboxamides
作者:Daiane M. Xavier、Bruna S. Goldani、Natália Seus、Raquel G. Jacob、Thiago Barcellos、Márcio W. Paixão、Rafael Luque、Diego Alves
DOI:10.1016/j.ultsonch.2016.05.007
日期:2017.1
We described herein the use of sonochemistry in the organocatalytic enamine-azide [3+2] cycloadditions of β-oxo-amides with a range of substituted arylazides. These sonochemical promoted reactions were found to be amenable to a range of β-oxo amides or arylazides, providing an efficient access to new N-aryl-1,2,3-triazoyl carboxamides in good to excellent yields and short times of reaction.
Organocatalytic 1,3-Dipolar Cycloaddition Reaction of β-Keto Amides with Azides - Direct Access to 1,4,5-Trisubstituted 1,2,3-Triazole-4-carboxamides
作者:Xiao Zhou、Xianhong Xu、Kun Liu、Hua Gao、Wei Wang、Wenjun Li
DOI:10.1002/ejoc.201600157
日期:2016.4
Organocatalytic [3+2] 1,3-dipolar cycloaddition reactions of β-keto amides with azides catalyzed by 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) have been developed. This strategy generates 1,4,5-trisubstituted 1,2,3-triazole-4-carboxamides in high yields and regioselectivities at room temperature. The reaction conditions have been optimized, and the scope of the β-keto amide and azide have been investigated