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Kocúrik M, Bartáček J, Drabina P, Váňa J, Svoboda J, Husáková L, Finger V, Hympánová M, Sedlák M. Immobilization of Trifluoromethyl-Substituted Pyridine-Oxazoline Ligand and Its Application in Asymmetric Continuous Flow Synthesis of Benzosultams. J Org Chem 2023; 88:15189-15197. [PMID: 37823216 PMCID: PMC10629231 DOI: 10.1021/acs.joc.3c01671] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2023] [Indexed: 10/13/2023]
Abstract
This study presents an improved synthetic route to ligand (S)-4-(tert-butyl)-2-(5-(trifluoromethyl)pyridin-2-yl)-4,5-dihydrooxazole and its application as a highly active and enantioselective catalyst in the addition of arylboronic acids to cyclic N-sulfonylketimines. Immobilization of such a ligand was achieved using a commercially available starting material and a PS-PEG TentaGel S NH2 support, resulting in a stable heterogeneous catalyst. Although the anchored catalyst exhibited a slight reduction in enantioselectivity and a 4-fold decrease in reaction rate, it displayed remarkable stability, enabling 10 consecutive reaction cycles. Furthermore, the successful transition to a continuous flow system demonstrated even higher turnover numbers compared to batch arrangements. These findings provide valuable insights into the development of efficient flow reactors for continuous synthesis of benzosultams, further advancing the field of asymmetric catalysis.
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Affiliation(s)
- Martin Kocúrik
- Institute
of Organic Chemistry and Technology, Faculty of Chemical Technology, University of Pardubice, Studentská 573, Pardubice, CZ 532 10, Czech Republic
| | - Jan Bartáček
- Institute
of Organic Chemistry and Technology, Faculty of Chemical Technology, University of Pardubice, Studentská 573, Pardubice, CZ 532 10, Czech Republic
| | - Pavel Drabina
- Institute
of Organic Chemistry and Technology, Faculty of Chemical Technology, University of Pardubice, Studentská 573, Pardubice, CZ 532 10, Czech Republic
| | - Jiří Váňa
- Institute
of Organic Chemistry and Technology, Faculty of Chemical Technology, University of Pardubice, Studentská 573, Pardubice, CZ 532 10, Czech Republic
| | - Jan Svoboda
- Institute
of Organic Chemistry and Technology, Faculty of Chemical Technology, University of Pardubice, Studentská 573, Pardubice, CZ 532 10, Czech Republic
| | - Lenka Husáková
- Department
of Analytical Chemistry, Faculty of Chemical Technology, University of Pardubice, Studentská 573, Pardubice, CZ 532 10, Czech Republic
| | - Vladimír Finger
- Faculty
of Pharmacy in Hradec Králové, Charles University, Akademika Heyrovského 1203,
50005, Hradec Králové, CZ 500 05, Czech Republic
- Biomedical
Research Center, University Hospital Hradec Králové, Sokolská 581, Hradec Králové, CZ 500 05, Czech Republic
| | - Michaela Hympánová
- Biomedical
Research Center, University Hospital Hradec Králové, Sokolská 581, Hradec Králové, CZ 500 05, Czech Republic
- Faculty
of Military Health Sciences, University
of Defence, Trebešská
1575, Hradec Králové, CZ 500 01, Czech Republic
| | - Miloš Sedlák
- Institute
of Organic Chemistry and Technology, Faculty of Chemical Technology, University of Pardubice, Studentská 573, Pardubice, CZ 532 10, Czech Republic
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