three‐component reaction to synthesize 1,4,5‐trisubstituted 1,2,3‐triazoles from readily available building blocks, such as aldehydes, nitroalkanes, and organic azides, is described. The process is enabled by an organocatalyzed Knoevenagelcondensation of the formyl group with the nitro compound, which is followed by the 1,3‐dipolar cycloaddition of the azide to the activated alkene. The reaction features an excellent
A novel and facile synthesis of 1,4,5-trisubstituted 1,2,3-triazoles from benzylic alcohols through a one-pot, three-component system
作者:Davir González-Calderón、Itzel Santillán-Iniesta、Carlos A. González-González、Aydeé Fuentes-Benítes、Carlos González-Romero
DOI:10.1016/j.tetlet.2014.12.019
日期:2015.1
A simple one-pot procedure has been developed to efficiently prepare 1,4,5-trisubstituted1,2,3-triazolesfrom benzylic alcohols. The presence of diphenylphosphoryl azide (DPPA) and active ketones allows for an azide–enolate [3+2] cycloaddition by use of DBU.
Another Example of Organo-Click Reactions: TEMPO-Promoted Oxidative Azide-Olefin Cycloaddition for the Synthesis of 1,2,3-Triazoles in Water
作者:Dasari Gangaprasad、John Paul Raj、Tayyala Kiranmye、Kesavan Karthikeyan、Jebamalai Elangovan
DOI:10.1002/ejoc.201601121
日期:2016.12
The water-mediated, metal-free, 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO) promoted oxidative [3+2] cycloaddition of organic azides with electron-deficient terminal and internal olefins was explored. A library of 1,4-disubstituted and 1,4,5-trisubstituted-1,2,3-triazoles were synthesized in moderate to excellent yields. This method was also found to be compatible not only with open-chain olefins
A straightforward and versatile approach to the synthesis of 1,4,5-trisubstituted 1,2,3-triazoles from alkyl halides via a one-pot, three-component reaction
作者:Davir González-Calderón、José G. Aguirre-De Paz、Carlos A. González-González、Aydeé Fuentes-Benítes、Carlos González-Romero
DOI:10.1016/j.tetlet.2015.02.049
日期:2015.3
The preparation of 1,4,5-trisubstituted1,2,3-triazoles by the coupling of three components (alkyl halides, sodium azide, and active ketones) through an azide–enolate [3+2] cycloaddition (Dimroth cycloaddition) has been developed for the first time. A wide variety of halides (including chlorides, bromides, and iodides as well as primary and secondary derivatives) have demonstrated the versatility of
Metal- and Base-Free Three-Component Reaction of Ynones, Sodium Azide, and Alkyl Halides: Highly Regioselective Synthesis of 2,4,5-Trisubstituted 1,2,3-NH-Triazoles
A base- and metal-free three-component reaction of ynones, sodium azide, and alkyl halides is developed for the regioselective synthesis of 2,4,5-trisubstituted-1,2,3-triazoles. The method is general, convenient, environmentally benign, atom-economical, and high-yielding.