Hernandez R RA, Burchell-Reyes K, Braga APCA, Lopez JK, Forgione P. Solvent-free synthesis of 3,5-isoxazoles
via 1,3-dipolar cycloaddition of terminal alkynes and hydroxyimidoyl chlorides over Cu/Al
2O
3 surface under ball-milling conditions.
RSC Adv 2022;
12:6396-6402. [PMID:
35424611 PMCID:
PMC8981965 DOI:
10.1039/d1ra08443g]
[Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2022] [Accepted: 02/10/2022] [Indexed: 01/20/2023] Open
Abstract
Scalable, solvent-free synthesis of 3,5-isoxazoles under ball-milling conditions has been developed. The proposed methodology allows the synthesis of 3,5-isoxazoles in moderate to excellent yields from terminal alkynes and hydroxyimidoyl chlorides, using a recyclable Cu/Al2O3 nanocomposite catalyst. Furthermore, the proposed conditions are reproducible to a 1.0-gram scale without further milling time variations.
A practical and scalable mechanochemical 1,3-dipolar cycloaddition between hydroxyimidoyl chlorides and terminal alkynes catalyzed by Cu/Al2O3 allows a quick access to 3,5-isoxazole derivatives.![]()
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