Copper Nanoparticles on Montmorillonite K-10: A Versatile Catalyst for the One-Pot Synthesis of 3,5-Disubstituted Isoxazoles Using Various Methodologies
作者:Gabriel Radivoy、Santiago Stabile、Esteban E. Bjerg
DOI:10.1055/a-2193-4701
日期:2024.1
heterogeneous catalyst composed of copper nanoparticles supported on montmorillonite K-10 (CuNPs/MK-10) has proven to be highly effective in catalyzing the synthesis of isoxazoles through various one-pot methodologies with high atom economy. These methodologies allow for the use of readily available starting materials, including aldehydes and alkynes through 1,3-dipolar cycloaddition reactions, as well as via
Gold‐Catalyzed Cyclization of Yndiamides with Isoxazoles via α‐Imino Gold Fischer Carbenes
作者:Zixuan Tong、Philip J. Smith、Helena D. Pickford、Kirsten E. Christensen、Edward A. Anderson
DOI:10.1002/chem.202302821
日期:2023.12.14
Gold-catalyzed [3+2] aminative cyclization of yndiamides and isoxazoles affords polysubstituted diaminopyrroles via the intermediacy of an α-imino gold Fischercarbene. The reaction proceeds rapidly under mild conditions; high regioselectivity was achieved via a subtle steric bias between the nitrogen substituents, as supported by DFT calculations. The reaction outcome could be switched to 1,4-oxazepines
A Light-Induced Vinylogous Nazarov-Type Cyclization
作者:Stefan Pusch、Dieter Schollmeyer、Till Opatz
DOI:10.1021/acs.orglett.6b01449
日期:2016.7.1
The first examples of a photochemically induced vinylogous Nazarov-type cyclization forming a cycloheptadienone core are described. The reaction can be included in a three-step cascade consisting of a photochemical isoxazole–azirine ring contraction, cobalt(II)-catalyzed ring expansion, and the photochemical cyclization. Furthermore, the first representative of the hitherto unknown 1-azatricyclo[2