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Chniti S, Pongrácz P, Kollár L, Bényei A, Dörnyei Á, Takács A. Synthesis of Chroman-2,4-diones via Ring-Opening/Ring-Closing Reaction Involving Palladium-Catalyzed Intramolecular Aryloxycarbonylation. J Org Chem 2024; 89:1175-1183. [PMID: 38193890 PMCID: PMC10804402 DOI: 10.1021/acs.joc.3c02337] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2023] [Revised: 12/06/2023] [Accepted: 12/21/2023] [Indexed: 01/10/2024]
Abstract
Palladium-catalyzed aminocarbonylation of 3-iodochromone was studied in the presence of primary and secondary amines using atmospheric pressure of carbon monoxide as a carbonyl source. This procedure successfully provided a library of chromone-3-carboxamides and 3-substituted chroman-2,4-diones in 40 to 92% isolated yields. The reaction proceeded via highly chemoselective aminocarbonylation (up to 100%) in the presence of secondary amines by using monodentate or bidentate phosphine ligands. The tendency of 3-iodochromone substrate to undergo ANRORC rearrangement with N-nucleophiles was crucial to shift the reaction toward an unprecedented chemoselective carbonylative transformation, where a late-stage carbonyl insertion is favored concomitantly to the last ring-closure step. The proposed aza-Michael addition/ring-opening/intramolecular aryloxycarbonylation sequence showed compatibility, uniquely, to primary amines when XantPhos was used as a ligand. The solid-state structures of chromone-3-carboxamide (2a) and chroman-2,4-dione (3s) were undoubtedly established by single-crystal XRD analysis. A catalytic cycle was proposed to rationalize the formation of the two types of carbonylated compounds.
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Affiliation(s)
- Sami Chniti
- Department
of General and Inorganic Chemistry, Faculty of Sciences, University of Pécs, Ifjúság u. 6., Pécs H-7624, Hungary
| | - Péter Pongrácz
- Department
of General and Inorganic Chemistry, Faculty of Sciences, University of Pécs, Ifjúság u. 6., Pécs H-7624, Hungary
| | - László Kollár
- Department
of General and Inorganic Chemistry, Faculty of Sciences, University of Pécs, Ifjúság u. 6., Pécs H-7624, Hungary
- János
Szentágothai Research Centre, University
of Pécs, Ifjúság
u. 20., Pécs H-7624, Hungary
- HUN-REN-PTE
Research Group for Selective Chemical Syntheses, Ifjúság u. 6., Pécs H-7624, Hungary
| | - Attila Bényei
- Department
of Physical Chemistry, University of Debrecen, Egyetem tér 1., Debrecen H-4032, Hungary
| | - Ágnes Dörnyei
- Department
of Analytical and Environmental Chemistry, Faculty of Sciences, University of Pécs, Ifjúság u. 6., Pécs H-7624, Hungary
| | - Attila Takács
- János
Szentágothai Research Centre, University
of Pécs, Ifjúság
u. 20., Pécs H-7624, Hungary
- HUN-REN-PTE
Research Group for Selective Chemical Syntheses, Ifjúság u. 6., Pécs H-7624, Hungary
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Affiliation(s)
- Gajanan
- Department of Medicinal Chemistry National Institute of Pharmaceutical Education and Research, Sector 67, S. A. S. Nagar Punjab 160 062 India
| | - K. Rathod
- Department of Medicinal Chemistry National Institute of Pharmaceutical Education and Research, Sector 67, S. A. S. Nagar Punjab 160 062 India
| | - Rahul Jain
- Department of Medicinal Chemistry National Institute of Pharmaceutical Education and Research, Sector 67, S. A. S. Nagar Punjab 160 062 India
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