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Sieg G, Pessemesse Q, Reith S, Yelin S, Limberg C, Munz D, Werncke CG. Cobalt and Iron Stabilized Ketyl, Ketiminyl and Aldiminyl Radical Anions. Chemistry 2021; 27:16760-16767. [PMID: 34569676 PMCID: PMC9298351 DOI: 10.1002/chem.202103096] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2021] [Indexed: 01/02/2023]
Abstract
Carbonyl and iminyl based radical anions are reactive intermediates in a variety of transformations in organic synthesis. Herein, the isolation of ketyl, and more importantly unprecedented ketiminyl and aldiminyl radical anions coordinated to cobalt and iron complexes is presented. Insights into the electronic structure of these unusual metal bound radical anions is provided by X‐Ray diffraction analysis, NMR, IR, UV/Vis and Mössbauer spectroscopy, solid and solution state magnetometry, as well as a by a detailed computational analysis. The metal bound radical anions are very reactive and facilitate the activation of intra‐ and intermolecular C−H bonds.
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Affiliation(s)
- Grégoire Sieg
- Fachbereich Chemie, Philipps-Universität Marburg, Hans-Meerwein-Straße 4, 35043, Marburg, Germany
| | - Quentin Pessemesse
- Univ. Lyon, ENS de Lyon, CNRS UMR 5182 Université Claude Bernard Lyon 1, Laboratoire de Chimie, 69342, Lyon, France.,Anorganische Chemie: Koordinationschemie Campus C4.1, Universität des Saarlandes, 66123, Saarbrücken, Germany
| | - Sascha Reith
- Fachbereich Chemie, Philipps-Universität Marburg, Hans-Meerwein-Straße 4, 35043, Marburg, Germany
| | - Stefan Yelin
- Institut für Chemie, Humboldt-Universität zu Berlin, Brook-Taylor-Str. 2, 12489, Berlin, Germany
| | - Christian Limberg
- Institut für Chemie, Humboldt-Universität zu Berlin, Brook-Taylor-Str. 2, 12489, Berlin, Germany
| | - Dominik Munz
- Anorganische Chemie: Koordinationschemie Campus C4.1, Universität des Saarlandes, 66123, Saarbrücken, Germany.,Department Chemie und Pharmazie, Friedrich-Alexander Universität (FAU) Erlangen-Nürnberg, Egerlandstr. 1, D-91058, Erlangen, Germany
| | - C Gunnar Werncke
- Fachbereich Chemie, Philipps-Universität Marburg, Hans-Meerwein-Straße 4, 35043, Marburg, Germany
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Saenko EV, Laikov DN, Baranova IA, Feldman VI. Communication: Stabilization of radical anions with weakly bound electron in condensed media: A case study of diacetonyl radical anion. J Chem Phys 2011; 135:101103. [DOI: 10.1063/1.3638690] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Molander GA, George KM, Monovich LG. Total Synthesis of (+)-Isoschizandrin Utilizing a Samarium(II) Iodide-Promoted 8-Endo Ketyl−Olefin Cyclization. J Org Chem 2003; 68:9533-40. [PMID: 14656077 DOI: 10.1021/jo0347361] [Citation(s) in RCA: 107] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The 13-step synthesis of (+)-isoschizandrin reported herein features a samarium(II) iodide-promoted 8-endo ketyl-olefin coupling to assemble the eight-membered ring present in the target concomitantly with the required functionality and stereochemistry. In constructing (+)-isoschizandrin as a single atropisomer, the synthesis utilizes a kinetic resolution of a seven-membered lactone using a CBS-oxazaborolidine.
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Affiliation(s)
- Gary A Molander
- Roy and Diana Vagelos Laboratories, Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6323, USA.
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An ESR and ab-initio MO study of πCH2–n0 orbital crossover in cycloalkylketone radical cations. Chem Phys Lett 2000. [DOI: 10.1016/s0009-2614(00)00207-4] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Mechanism and stereochemistry of alkali metal reductions of cyclic saturated and unsaturated ketones in protic solvents. Tetrahedron 1986. [DOI: 10.1016/s0040-4020(01)88098-4] [Citation(s) in RCA: 70] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Gloux J, Guglielmi M, Lemaire H. Radicaux libres crées par irradiation gamma en série bicyclo[2,2,1]heptanique. Mol Phys 1970. [DOI: 10.1080/00268977000101851] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Bennett J, Mile B, Thomas A, Ward B. The Study of Free Radicals and their Reactions at Low Temperature Using a Rotating Cryostat. ADVANCES IN PHYSICAL ORGANIC CHEMISTRY 1970. [DOI: 10.1016/s0065-3160(08)60320-2] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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Moorthy PN, Gopinathan C, Rao KN. Effect of acids on the gamma-radiolysis of frozen aqueous systems of some organic compounds. ACTA ACUST UNITED AC 1970. [DOI: 10.1080/00337577008243050] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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