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Agafonova A, Sakharov P, Smetanin I, Rostovskii NV, Khlebnikov AF, Novikov M. Stannyl radical-mediated synthesis of 6H-1,3-oxazin-6-ones from 2-acyloxyazirines or whether free radicals can open the azirine ring? Org Chem Front 2022. [DOI: 10.1039/d2qo00783e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A fundamentally new radical cascade reaction of 2-acyloxyazirines underlays an effective one-step method for the preparation of 5-hydroxy-6H-1,3-oxazin-6-ones from methyl 2-acyloxy-2H-azirine-2-carboxylates using Bu3SnH/ACHN system as a source of stannyl radicals....
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Deng R, Zhan S, Li C, Gu Z. Hypervalent‐Iodine‐Mediated Carbon–Carbon Bond Cleavage and Dearomatization of 9
H
‐Fluoren‐9‐ols. Angew Chem Int Ed Engl 2020; 59:3093-3098. [DOI: 10.1002/anie.201913373] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2019] [Revised: 11/23/2019] [Indexed: 12/18/2022]
Affiliation(s)
- Ruixian Deng
- Department of ChemistryCenter for Excellence in Molecular SynthesisHefei National Laboratory for Physical Sciences at the MicroscaleUniversity of Science and Technology of China 96 Jinzhai Road Hefei Anhui 230026 China
| | - Shuming Zhan
- Department of ChemistryCenter for Excellence in Molecular SynthesisHefei National Laboratory for Physical Sciences at the MicroscaleUniversity of Science and Technology of China 96 Jinzhai Road Hefei Anhui 230026 China
| | - Chunyu Li
- Department of ChemistryCenter for Excellence in Molecular SynthesisHefei National Laboratory for Physical Sciences at the MicroscaleUniversity of Science and Technology of China 96 Jinzhai Road Hefei Anhui 230026 China
| | - Zhenhua Gu
- Department of ChemistryCenter for Excellence in Molecular SynthesisHefei National Laboratory for Physical Sciences at the MicroscaleUniversity of Science and Technology of China 96 Jinzhai Road Hefei Anhui 230026 China
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3
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Deng R, Zhan S, Li C, Gu Z. Hypervalent‐Iodine‐Mediated Carbon–Carbon Bond Cleavage and Dearomatization of 9
H
‐Fluoren‐9‐ols. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.201913373] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Affiliation(s)
- Ruixian Deng
- Department of Chemistry Center for Excellence in Molecular Synthesis Hefei National Laboratory for Physical Sciences at the Microscale University of Science and Technology of China 96 Jinzhai Road Hefei Anhui 230026 China
| | - Shuming Zhan
- Department of Chemistry Center for Excellence in Molecular Synthesis Hefei National Laboratory for Physical Sciences at the Microscale University of Science and Technology of China 96 Jinzhai Road Hefei Anhui 230026 China
| | - Chunyu Li
- Department of Chemistry Center for Excellence in Molecular Synthesis Hefei National Laboratory for Physical Sciences at the Microscale University of Science and Technology of China 96 Jinzhai Road Hefei Anhui 230026 China
| | - Zhenhua Gu
- Department of Chemistry Center for Excellence in Molecular Synthesis Hefei National Laboratory for Physical Sciences at the Microscale University of Science and Technology of China 96 Jinzhai Road Hefei Anhui 230026 China
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Duecker FL, Heinze RC, Heretsch P. Synthesis of Swinhoeisterol A, Dankasterone A and B, and Periconiastone A by Radical Framework Reconstruction. J Am Chem Soc 2019; 142:104-108. [DOI: 10.1021/jacs.9b12899] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Fenja L. Duecker
- Institute of Chemistry and Biochemistry, Freie Universität Berlin, Takustraße 3, 14195 Berlin, Germany
| | - Robert C. Heinze
- Institute of Chemistry and Biochemistry, Freie Universität Berlin, Takustraße 3, 14195 Berlin, Germany
| | - Philipp Heretsch
- Institute of Chemistry and Biochemistry, Freie Universität Berlin, Takustraße 3, 14195 Berlin, Germany
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León EI, Martín A, Pérez-Martín I, Suárez E. Reductive Radical Cascades Triggered by Alkoxyl Radicals in the β-Cyclodextrin Framework. Org Lett 2018; 20:3385-3389. [DOI: 10.1021/acs.orglett.8b01308] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Elisa I. León
- Síntesis de Productos Naturales, Instituto de Productos Naturales y Agrobiología del CSIC, Carretera de la Esperanza 3, 38206 La Laguna, Tenerife, Spain
| | - Angeles Martín
- Síntesis de Productos Naturales, Instituto de Productos Naturales y Agrobiología del CSIC, Carretera de la Esperanza 3, 38206 La Laguna, Tenerife, Spain
| | - Inés Pérez-Martín
- Síntesis de Productos Naturales, Instituto de Productos Naturales y Agrobiología del CSIC, Carretera de la Esperanza 3, 38206 La Laguna, Tenerife, Spain
| | - Ernesto Suárez
- Síntesis de Productos Naturales, Instituto de Productos Naturales y Agrobiología del CSIC, Carretera de la Esperanza 3, 38206 La Laguna, Tenerife, Spain
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Affiliation(s)
- Masahiro Murakami
- Department of Synthetic Chemistry and Biological Chemistry, Kyoto University, Katsura, Kyoto 615-8510
| | - Naoki Ishida
- Department of Synthetic Chemistry and Biological Chemistry, Kyoto University, Katsura, Kyoto 615-8510
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7
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Chou TC, Lin GH, Yeh YL, Lin KJ. Synthetic Approach Towards Hexaprismane. A Novel Entry to Homosecohexaprismane Skeleton by Cage Enlargement. J CHIN CHEM SOC-TAIP 2013. [DOI: 10.1002/jccs.199700073] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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8
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Prakash C, Mohanakrishnan AK. Synthesis of Angularly Fused Carbocycles via Tandem Radical Cyclization of α-Carbonyl Radicals. European J Org Chem 2008. [DOI: 10.1002/ejoc.200700986] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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9
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Mohanakrishnan AK, Prakash C, Ramesh N. A simple iodination protocol via in situ generated ICl using NaI/FeCl3. Tetrahedron 2006. [DOI: 10.1016/j.tet.2006.01.067] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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10
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Boto A, Hernández D, Hernández R, Suárez E. beta-Fragmentation of primary alkoxyl radicals versus hydrogen abstraction: synthesis of polyols and alpha,omega-differently substituted cyclic ethers from carbohydrates. J Org Chem 2003; 68:5310-9. [PMID: 12816493 DOI: 10.1021/jo034442f] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The beta-fragmentation of primary alkoxyl radicals, described in many cases as low-yielding and plagued by side reactions, can proceed in satisfactory yields using carbohydrate substrates. The only reaction that can compete significantly with the beta-scission is the intramolecular hydrogen abstraction. The ratio of beta-fragmentation to hydrogen abstraction can be varied according to the reaction conditions, the stereochemistry of the substituents (e.g., alpha- or beta-anomeric substituents), and the protecting groups chosen. The carbohydrate substrates are easily prepared, and the mild reaction conditions are compatible with most functional groups. The beta-scission reaction provides an expedient way toward shorter and less common sugar series and also toward alpha,omega-differently substituted cyclic ethers. These units are useful building blocks and are present in many natural products with interesting biological activity.
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Affiliation(s)
- Alicia Boto
- Instituto de Productos Naturales y Agrobiología del C.S.I.C., Carretera de La Esperanza 3, 38206 La Laguna, Tenerife, Spain
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Martı́n A, Pérez-Martı́n I, Suárez E. Sequential alkoxy radical fragmentation–intermolecular allylation in carbohydrate systems. Tetrahedron Lett 2002. [DOI: 10.1016/s0040-4039(02)00911-5] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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12
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Goto M, Miyoshi I, Ishii Y, Ogasawara Y, Kakimoto YI, Nagumo S, Nishida A, Kawahara N, Nishida M. Novel skeletal rearrangement of hydroindan derivatives into hydroazulenones via an alkoxy radical. Tetrahedron 2002. [DOI: 10.1016/s0040-4020(02)00102-3] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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13
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McCarroll AJ, Walton JC. Programmierung organischer Moleküle: Design und Management organischer Synthesen über radikalische Kaskaden. Angew Chem Int Ed Engl 2001. [DOI: 10.1002/1521-3757(20010618)113:12<2282::aid-ange2282>3.0.co;2-f] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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14
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Moreno I, Tellitu I, Etayo J, SanMartı́n R, Domı́nguez E. Novel applications of hypervalent iodine: PIFA mediated synthesis of benzo[ c ]phenanthiridines and benzo[ c ]phenanthridinones. Tetrahedron 2001. [DOI: 10.1016/s0040-4020(01)00459-8] [Citation(s) in RCA: 62] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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15
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Kakimoto YI, Ogasawara Y, Nishida A, Kawahara N, Nishida M, Takayanagi H. Skeletal Rearrangement via Alkoxy Radical: Conversion of Epoxydecalin Thiocarbonylimidazolides to Bicyclo[6.3.0]undecanones and Bicyclo[5.3.1]undecanones. Tetrahedron 2000. [DOI: 10.1016/s0040-4020(00)00635-9] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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16
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Matsukawa S, Sugama H, Imamoto T. Synthesis of P-chirogenic diphosphine oxides and their use in catalytic asymmetric Diels–Alder reaction. Tetrahedron Lett 2000. [DOI: 10.1016/s0040-4039(00)01030-3] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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17
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An approach to the synthesis of CP-263,114: complementary routes to the bicyclic ring system via two kinds of fragmentation reaction. Tetrahedron Lett 1999. [DOI: 10.1016/s0040-4039(99)00941-7] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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18
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19
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Skeletal rearrangement via alkoxy radical: Conversion of epoxydecalin thiocarbonylimidazolide to bicyclo[6.3.0]undecanone and bicyclo[5.3.1]undecanone. Tetrahedron Lett 1997. [DOI: 10.1016/s0040-4039(97)01190-8] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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20
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21
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Affiliation(s)
- Peter J. Stang
- Department of Chemistry, University of Minnesota-Duluth, Duluth, Minnesota 55812
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Padwa A, Price AT, Zhi L. A Novel Cycloaddition Reaction of α-Diazo-γ-amido Ketones Catalyzed by Rhodium(II) Acetate. Scope and Mechanistic Details of the Process. J Org Chem 1996. [DOI: 10.1021/jo952078h] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Albert Padwa
- Department of Chemistry, Emory University, Atlanta, Georgia 30322
| | - Alan T. Price
- Department of Chemistry, Emory University, Atlanta, Georgia 30322
| | - Lin Zhi
- Department of Chemistry, Emory University, Atlanta, Georgia 30322
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Crich D, Sun S, Brunckova J. Chemistry of 1-Alkoxy-1-glycosyl Radicals: The Manno- and Rhamnopyranosyl Series. Inversion of alpha- to beta-Pyranosides and the Fragmentation of Anomeric Radicals. J Org Chem 1996; 61:605-615. [PMID: 11666981 DOI: 10.1021/jo951194h] [Citation(s) in RCA: 71] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The formation and stereoselective quenching of 1-mannopyranosyl radicals by a tributyltin hydride-mediated intramolecular 1,5-hydrogen abstraction sequence is described. A competing process is 1,4-hydrogen atom abstraction leading principally to glucopyran-2-ulosides. Fragmentation of the anomeric radical resulting in the formation of ring opened products is a problem in certain series. The chemistry is dictated to a considerable extent by the nature of the protecting groups employed with the 4,6-benzylidene series and, for rhamnose, the Ley 3,4-dispiroketal, being particularly susceptible to the 1,4-hydrogen atom abstraction but less to the fragmentation. Photochemical conditions are described, in which these side reactions are practically eliminated, and applied to the inversion of an alpha- to a beta-mannoside in a disaccharide.
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Affiliation(s)
- David Crich
- Department of Chemistry, University of Illinois at Chicago, 845 West Taylor Street, Chicago, Illinois 60607-7061
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Padwa A, Curtis EA, Sandanayaka VP. Generation and Cycloaddition Behavior of Spirocyclic Carbonyl Ylides. Application to the Synthesis of the Pterosin Family of Sesquiterpenes. J Org Chem 1996. [DOI: 10.1021/jo951371e] [Citation(s) in RCA: 42] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Albert Padwa
- Department of Chemistry, Emory University, Atlanta, Georgia 30322
| | - Erin A. Curtis
- Department of Chemistry, Emory University, Atlanta, Georgia 30322
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Troyansky EI, Ismagilov RF, Samoshin VV, Strelenko YA, Demchuk DV, Nikishin GI, Lindeman SV, Khrustalyov VN, Struchkov YT. Stereoselective free radical cycloaddition-macrocyclization in facile synthesis of trans-cyclohexano-fused 12-membered crown thioethers. Tetrahedron 1995. [DOI: 10.1016/0040-4020(95)00707-f] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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27
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Harrowven DC, Browne R. Cascade radical reactions in synthesis: A new and general approach to condensed thiophenes. Tetrahedron Lett 1995. [DOI: 10.1016/0040-4039(95)00368-m] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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28
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Troyansky EI, Ismagilov RF, Strelenko YA, Samoshin VV, Demchuk DV, Nikishin GI, Lindeman SV, Khrustalyov VV, Struchkov YT. Remote asymmetric induction in free radical cycloaddition leading to trans-cyclohexano-fused 12-membered crown thioethers. Tetrahedron Lett 1995. [DOI: 10.1016/0040-4039(95)00287-5] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Troyansky EI, lsmagilov RF, Korneeva EN, Pogosyan MS, Nikishin GI. An Approach to 8-, 16- and 24-Membered Sulfur-containing Heterocycles via Homolytic Cycloaddition of Alkynes with Butane-1,4-dithiol. MENDELEEV COMMUNICATIONS 1995. [DOI: 10.1070/mc1995v005n01abeh000441] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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30
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Intramolecular hydrogen atom abstraction in carbohydrates and nucleosides: Inversion of an α- to β-mannopyranoside and generation of thymidine C-4′ radicals. Tetrahedron Lett 1994. [DOI: 10.1016/s0040-4039(00)73450-2] [Citation(s) in RCA: 42] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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31
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Cascade radical reactions in synthesis. A new radical mediated double ring expansion-cyclisation process with oxime ethers. Tetrahedron Lett 1993. [DOI: 10.1016/s0040-4039(00)61702-1] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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32
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Rawal VH, Zhong HM. Radical-induced epoxide fragmentation chemistry, V. Formation of medium-sized rings via β-scission of alkoxy radicals. Tetrahedron Lett 1993. [DOI: 10.1016/s0040-4039(00)73951-7] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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