Boronic Acid Catalysis for Mild and Selective [3+2] Dipolar Cycloadditions to Unsaturated Carboxylic Acids
作者:Hongchao Zheng、Robert McDonald、Dennis G. Hall
DOI:10.1002/chem.200903484
日期:2010.5.10
activation of unsaturated carboxylic acids is applied in several classic dipolar [3+2] cycloadditions involving azides, nitrile oxides, and nitrones as partners. These cycloadditions can be used to produce pharmaceutically interesting, small heterocyclic products, such as triazoles, isoxazoles, and isoxazolidines. These cycloadducts are formed directly and include a free carboxylic acid functionality that can
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
Antiaggregating and Antithrombotic Activities of new 1, 2, 3-Triazolecarboxamides
作者:Anke Cwiklicki、Klaus Rehse
DOI:10.1002/ardp.200300837
日期:2004.3
Twenty five new triazolecarboxamides related to YC‐1 were prepared and tested for their antiplatelet (in vitro) and antithrombotic (in vivo) activities. Five of them inhibited the aggregation of blood platelets (Born test, inducer collagen) with IC50 values between 90 and 130 μM. Nine compounds exhibited significant antithrombotic properties with an inhibition of thrombus formation between 11 and 7%
A three-component 3+2 cycloaddition reaction followed by Suzuki coupling reaction was carried out to synthesize a library of compounds using automation (parallel synthesizer). Scaffolds that are unexplored in literature were used for the synthesis of library. The iodo-triazoles formed by 3+2 cycloaddition reaction were coupled with boronic acids to get tri-substituted triazoles.
Tunable Synthesis of 1,2,3‐Triazoles and Enamines through Deacylative Azide‐Alkene Cycloaddition
作者:R. Rengasamy、J. Paul Raj、K. Vijayalakshmi、N. Punitha、M. Kesavan、M. Vajjiravel、Jebamalai Elangovan
DOI:10.1002/ejoc.202101470
日期:2022.4.27
A [3+2] cycloaddition of activated olefins and organic azides leading to 1,4,5-trisubstituted 1,2,3-triazoles and enamines is reported. Triazoles were achieved in good yields from benzylidene diketones and organic azides by using copper oxide nanoparticles as catalyst while enamines were synthesized in good to excellent yields from benzylidene malonates and organic azides under solvent-free and catalyst-free