Synthesis 2024; 56(02): 281-292
DOI: 10.1055/a-2193-4701
paper

Copper Nanoparticles on Montmorillonite K-10: A Versatile Catalyst for the One-Pot Synthesis of 3,5-Disubstituted Isoxazoles Using Various Methodologies

Santiago Stabile
,
Esteban E. Bjerg
,
This work was generously supported by the Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET, PIP-2021-2023-1665), Fondo para la Investigación Científica y Tecnológica, Agencia Nacional de Promoción Científica y Tecnológica (ANPCyT, Prest. BID PICT-2018-2471), and Secretaría General de Ciencia y Tecnología, Universidad Nacional del Sur (UNS, PGI 24/Q106) from Argentina. S.S. thanks CONICET for a postdoctoral fellowship and E.E.B. thanks CONICET for a doctoral fellowship.


Abstract

A readily prepared and versatile 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 cycloisomerization of ynones. Additionally, the CuNPs/MK-10 catalyst promoted the in situ formation of the ynones via an acyl Sonogashira coupling. Furthermore, a three-step one-pot methodology was also developed, starting from carboxylic acids and involving the in situ generation of acyl chlorides.

Supporting Information



Publication History

Received: 01 August 2023

Accepted after revision: 17 October 2023

Accepted Manuscript online:
17 October 2023

Article published online:
20 November 2023

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