1
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Guégan F, Chemla F, Ferreira F, Gérard H, Perez-Luna A, Halbert S. Trans-Concerted Addition to Alkynes: the case of Ynamide Silylzincation. Chemistry 2024; 30:e202401751. [PMID: 38808477 DOI: 10.1002/chem.202401751] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2024] [Accepted: 05/24/2024] [Indexed: 05/30/2024]
Abstract
An original concerted antarafacial mechanism for the addition of diorganosilyl-zinc reagents across the C-C triple bond of ynamides is computationally investigated using DFT calculations. This concerted mechanism, leading to a trans-product in only one step, results in the formation of a Si-C and a Zn-C σ-bond on opposite sides of the π-system. We demonstrate that the mechanism going through a η2-vinyl intermediate and the proposal of a radical chain pathway are energetically unsustainable. The retained concerted antarafacial pathway is tested on experimental selectivities: the regioselectivity, in favor of the silyl β-addition in ynamide, and stereoselectivity, which is cis- with (Me2PhSi)2Zn but trans- with [(Me3Si)3Si]2Zn, are well reproduced by DFT calculations. The regio- and stereoselectivity are discussed using the activation strain model and a chemical bonding analysis.
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Affiliation(s)
- Frédéric Guégan
- Sorbonne Université, CNRS, Laboratoire de Chimie Théorique, LCT, F-75005, Paris, France
- Present Address: Institut de Chimie des Milieux et matériaux de Poitiers, CNRS, Université de Poitiers, 1 rue Marcel Doré, 86073, Poitiers, France
| | - Fabrice Chemla
- Sorbonne Université, CNRS, Institut Parisien de Chimie Moléculaire, IPCM, F-75005, Paris, France
| | - Franck Ferreira
- Sorbonne Université, CNRS, Institut Parisien de Chimie Moléculaire, IPCM, F-75005, Paris, France
| | - Hélène Gérard
- Sorbonne Université, CNRS, Laboratoire de Chimie Théorique, LCT, F-75005, Paris, France
| | - Alejandro Perez-Luna
- Sorbonne Université, CNRS, Institut Parisien de Chimie Moléculaire, IPCM, F-75005, Paris, France
| | - Stéphanie Halbert
- Sorbonne Université, CNRS, Laboratoire de Chimie Théorique, LCT, F-75005, Paris, France
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2
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Yamaguchi H, Takahashi F, Kurogi T, Yorimitsu H. Reductive anti-Dizincation of Arylacetylenes. Chem Asian J 2024; 19:e202400384. [PMID: 38647096 DOI: 10.1002/asia.202400384] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2024] [Revised: 04/22/2024] [Accepted: 04/22/2024] [Indexed: 04/25/2024]
Abstract
Arylacetylenes undergo anti-1,2-dizincation to afford trans-1,2-dizincioalkenes. The process employs sodium dispersion as a reducing agent and zinc chloride TMEDA complex as a reduction-resistant zinc electrophile. This reductive anti-dizincation contrasts with the conventional additive syn-dimetalation like silylzincation. The resulting dizincated alkenes undergo the cross-coupling to yield multi-substituted alkenes stereoselectively.
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Affiliation(s)
- Haruka Yamaguchi
- Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto, 606-8502, Japan
| | - Fumiya Takahashi
- Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto, 606-8502, Japan
| | - Takashi Kurogi
- Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto, 606-8502, Japan
| | - Hideki Yorimitsu
- Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto, 606-8502, Japan
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3
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Abstract
A novel diethylzinc-mediated radical 1,2-addition of perfluoroalkyl iodides to unactivated alkenes and alkynes is presented, which demonstrates a novel way to generate an ethyl difluoroacetate radical. This method is highly efficient and gives full conversions of the substrates, high yields of the products, and negligible byproducts and requires no column chromatography purifications. The mild conditions enable this protocol to exhibit excellent functional group compatibility.
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Affiliation(s)
- Xin Li
- Institute of Next Generation Matter Transformation, College of Materials Science & Engineering, Huaqiao University, 668 Jimei Boulevard, Xiamen 361021, Fujian, China
| | - Songtao He
- Institute of Next Generation Matter Transformation, College of Materials Science & Engineering, Huaqiao University, 668 Jimei Boulevard, Xiamen 361021, Fujian, China
| | - Qiuling Song
- Institute of Next Generation Matter Transformation, College of Materials Science & Engineering, Huaqiao University, 668 Jimei Boulevard, Xiamen 361021, Fujian, China.,State Key Laboratory of Organometallic Chemistry and Key Laboratory of Organofluorine Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai 200032, China
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4
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Zhang Y, Xu J, Guo H. Light-Induced Intramolecular Iodine-Atom Transfer Radical Addition of Alkyne: An Approach from Aryl Iodide to Alkenyl Iodide. Org Lett 2019; 21:9133-9137. [DOI: 10.1021/acs.orglett.9b03519] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Yanbin Zhang
- Department of Chemistry, Fudan University, 2005 Songhu Road, Shanghai 200438, PR China
| | - Jincheng Xu
- Department of Chemistry, Fudan University, 2005 Songhu Road, Shanghai 200438, PR China
| | - Hao Guo
- Department of Chemistry, Fudan University, 2005 Songhu Road, Shanghai 200438, PR China
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5
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Lingua H, Dwadnia N, Siri D, Bertrand MP, Feray L. Reactivity of benzylidene and alkylidenemalonates in radical addition mediated with dialkylzincs – An intriguing story. Tetrahedron 2018. [DOI: 10.1016/j.tet.2018.11.029] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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6
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Nishimoto Y, Kang K, Yasuda M. Regio- and Stereoselective Anti-Carbozincation of Alkynyl Ethers Using ZnBr 2 toward (Z)-β-Zincated Enol Ether Synthesis. Org Lett 2017; 19:3927-3930. [PMID: 28700238 DOI: 10.1021/acs.orglett.7b01847] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
(Z)-β-Aryloxyalkenylzincs are synthesized stereoselectively via anti-carbozincation among alkynyl ethers, silyl ketene acetals, and ZnBr2. X-ray analysis revealed the structure of the zinc species is a mononuclear two-coordinate dialkenylzinc that is transformed into functionalized enol ethers as a single isomer in the reaction of various electrophiles.
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Affiliation(s)
- Yoshihiro Nishimoto
- Frontier Research Base for Global Young Researchers, Center for Open Innovation Research and Education (COiRE), Graduate School of Engineering, and ‡Department of Applied Chemistry, Graduate School of Engineering, Osaka University , 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Kyoungmin Kang
- Frontier Research Base for Global Young Researchers, Center for Open Innovation Research and Education (COiRE), Graduate School of Engineering, and ‡Department of Applied Chemistry, Graduate School of Engineering, Osaka University , 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Makoto Yasuda
- Frontier Research Base for Global Young Researchers, Center for Open Innovation Research and Education (COiRE), Graduate School of Engineering, and ‡Department of Applied Chemistry, Graduate School of Engineering, Osaka University , 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
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7
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Yamada KI, Matsumoto Y, Fujii S, Konishi T, Yamaoka Y, Takasu K. Striking Difference between Succinimidomethyl and Phthalimidomethyl Radicals in Conjugate Addition to Alkylidenemalonate Initiated by Dimethylzinc. J Org Chem 2016; 81:3809-17. [DOI: 10.1021/acs.joc.6b00485] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Ken-ichi Yamada
- Graduate School of Pharmaceutical
Sciences, Kyoto University Yoshida, Sakyo-ku, Kyoto 606-8501, Japan
| | - Yusuke Matsumoto
- Graduate School of Pharmaceutical
Sciences, Kyoto University Yoshida, Sakyo-ku, Kyoto 606-8501, Japan
| | - Shintaro Fujii
- Graduate School of Pharmaceutical
Sciences, Kyoto University Yoshida, Sakyo-ku, Kyoto 606-8501, Japan
| | - Takehito Konishi
- Graduate School of Pharmaceutical
Sciences, Kyoto University Yoshida, Sakyo-ku, Kyoto 606-8501, Japan
| | - Yousuke Yamaoka
- Graduate School of Pharmaceutical
Sciences, Kyoto University Yoshida, Sakyo-ku, Kyoto 606-8501, Japan
| | - Kiyosei Takasu
- Graduate School of Pharmaceutical
Sciences, Kyoto University Yoshida, Sakyo-ku, Kyoto 606-8501, Japan
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8
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Fopp C, Romain E, Isaac K, Chemla F, Ferreira F, Jackowski O, Oestreich M, Perez-Luna A. Stereodivergent Silylzincation of α-Heteroatom-Substituted Alkynes. Org Lett 2016; 18:2054-7. [DOI: 10.1021/acs.orglett.6b00680] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Carolin Fopp
- Institut
für Chemie, Technische Universität Berlin, Strasse des 17.
Juni 115, D-10623 Berlin, Germany
| | - Elise Romain
- Sorbonne Universités, UPMC Univ Paris 06, CNRS UMR 8232, Institut Parisien de Chimie Moléculaire (IPCM), 4, place Jussieu, F-75005 Paris, France
| | - Kevin Isaac
- Sorbonne Universités, UPMC Univ Paris 06, CNRS UMR 8232, Institut Parisien de Chimie Moléculaire (IPCM), 4, place Jussieu, F-75005 Paris, France
| | - Fabrice Chemla
- Sorbonne Universités, UPMC Univ Paris 06, CNRS UMR 8232, Institut Parisien de Chimie Moléculaire (IPCM), 4, place Jussieu, F-75005 Paris, France
| | - Franck Ferreira
- Sorbonne Universités, UPMC Univ Paris 06, CNRS UMR 8232, Institut Parisien de Chimie Moléculaire (IPCM), 4, place Jussieu, F-75005 Paris, France
| | - Olivier Jackowski
- Sorbonne Universités, UPMC Univ Paris 06, CNRS UMR 8232, Institut Parisien de Chimie Moléculaire (IPCM), 4, place Jussieu, F-75005 Paris, France
| | - Martin Oestreich
- Institut
für Chemie, Technische Universität Berlin, Strasse des 17.
Juni 115, D-10623 Berlin, Germany
| | - Alejandro Perez-Luna
- Sorbonne Universités, UPMC Univ Paris 06, CNRS UMR 8232, Institut Parisien de Chimie Moléculaire (IPCM), 4, place Jussieu, F-75005 Paris, France
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9
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Abstract
A nickel-catalyzed carbo-carboxylation of diynes with ZnR2 is realized with the help of ester functionality demonstrating excellent chemo-, regio- and stereoselectivity.
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Affiliation(s)
- Tao Cao
- State Key Laboratory of Organometallic Chemistry
- Shanghai Institute of Organic Chemistry
- Chinese Academy of Sciences
- Shanghai 200032
- P. R. China
| | - Shengming Ma
- State Key Laboratory of Organometallic Chemistry
- Shanghai Institute of Organic Chemistry
- Chinese Academy of Sciences
- Shanghai 200032
- P. R. China
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10
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Beniazza R, Romain E, Chemla F, Ferreira F, Jackowski O, Perez-Luna A. Zinc Radical Transfer Based Modular Approach to Enantiopure Alkylidene-β-prolines fromN-(tert-Butylsulfinyl)-α-(aminomethyl)acrylates. European J Org Chem 2015. [DOI: 10.1002/ejoc.201501173] [Citation(s) in RCA: 6] [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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11
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Cheung CW, Hu X. Stereoselective Synthesis of Trisubstituted Alkenes through Sequential Iron-Catalyzed Reductiveanti-Carbozincation of Terminal Alkynes and Base-Metal-Catalyzed Negishi Cross-Coupling. Chemistry 2015; 21:18439-44. [DOI: 10.1002/chem.201504049] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2015] [Indexed: 01/29/2023]
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12
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Theoretical investigation of the reaction of dialkylzincs with α-alkoxycarbonyl radicals. Evaluation of α-bromoacrylates as radical acceptors in radical-polar crossover processes. Tetrahedron 2015. [DOI: 10.1016/j.tet.2015.09.045] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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13
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Affiliation(s)
- Ken-ichi Yamada
- Graduate School of Pharmaceutical Sciences; Kyoto University; Kyoto Japan
| | - Kiyoshi Tomioka
- Department of Medicinal Chemistry; Faculty of Pharmaceutical Sciences; Doshisha Women's College of Liberal Arts; Kyoto Japan
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14
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Romain E, Fopp C, Chemla F, Ferreira F, Jackowski O, Oestreich M, Perez-Luna A. Trans-Selective Radical Silylzincation of Ynamides. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201407002] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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15
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Romain E, Fopp C, Chemla F, Ferreira F, Jackowski O, Oestreich M, Perez-Luna A. Trans-Selective Radical Silylzincation of Ynamides. Angew Chem Int Ed Engl 2014; 53:11333-7. [DOI: 10.1002/anie.201407002] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2014] [Revised: 08/06/2014] [Indexed: 01/05/2023]
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16
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Jammi S, Maury J, Suppo JS, Bertrand MP, Feray L. Intramolecular Trapping of Allenylzincs by Carbonyl Groups. J Org Chem 2013; 78:12566-76. [DOI: 10.1021/jo4022293] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Affiliation(s)
- Suribabu Jammi
- Aix-Marseille Université, CNRS, Institut de Chimie Radicalaire UMR 7273, Equipe CMO, 13397 Cedex 20 Marseille, France
| | - Julien Maury
- Aix-Marseille Université, CNRS, Institut de Chimie Radicalaire UMR 7273, Equipe CMO, 13397 Cedex 20 Marseille, France
| | - Jean-Simon Suppo
- Aix-Marseille Université, CNRS, Institut de Chimie Radicalaire UMR 7273, Equipe CMO, 13397 Cedex 20 Marseille, France
| | - Michèle P. Bertrand
- Aix-Marseille Université, CNRS, Institut de Chimie Radicalaire UMR 7273, Equipe CMO, 13397 Cedex 20 Marseille, France
| | - Laurence Feray
- Aix-Marseille Université, CNRS, Institut de Chimie Radicalaire UMR 7273, Equipe CMO, 13397 Cedex 20 Marseille, France
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17
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Affiliation(s)
- Sachin T. Aiwale
- a Department of Food, Environmental and Nutritional Sciences , Università degli Studi di Milano , Milano , Italy
| | - Paola Sardi
- a Department of Food, Environmental and Nutritional Sciences , Università degli Studi di Milano , Milano , Italy
| | - Sabrina Dallavalle
- a Department of Food, Environmental and Nutritional Sciences , Università degli Studi di Milano , Milano , Italy
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18
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Chemla F, Dulong F, Ferreira F, Pérez-Luna A. Radical zinc-atom-transfer-based carbozincation of haloalkynes with dialkylzincs. Beilstein J Org Chem 2013; 9:236-45. [PMID: 23399921 PMCID: PMC3566799 DOI: 10.3762/bjoc.9.28] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2012] [Accepted: 01/08/2013] [Indexed: 01/27/2023] Open
Abstract
The formation of alkylidenezinc carbenoids by 1,4-addition/carbozincation of dialkylzincs or alkyl iodides based on zinc atom radical transfer, in the presence of dimethylzinc with β-(propargyloxy)enoates having pendant iodo- and bromoalkynes, is disclosed. Formation of the carbenoid intermediate is fully stereoselective at −30 °C and arises from a formal anti-selective carbozincation reaction. Upon warming, the zinc carbenoid is stereochemically labile and isomerizes to its more stable form.
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Affiliation(s)
- Fabrice Chemla
- Institut Parisien de Chimie Moléculaire (UMR 7201), FR 2769, UPMC Univ Paris 06, CNRS, Bâtiment F 2ème et., Case 183, 4 place Jussieu, F-75005 Paris, France
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19
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Jammi S, Mouysset D, Siri D, Bertrand MP, Feray L. Theoretical Support for the Involvement of a Radical Pathway in the Formation of Allenylzincs from Propargyl Iodides and Dialkylzincs: Influence of Zinc Coordination. J Org Chem 2013; 78:1589-603. [DOI: 10.1021/jo302704g] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Suribabu Jammi
- Aix-Marseille
Université, CNRS, Institut de Chimie Radicalaire, UMR 7273, Equipes †CMO and ‡CT, 13397 Cedex 20, Marseille, France
| | - Dominique Mouysset
- Aix-Marseille
Université, CNRS, Institut de Chimie Radicalaire, UMR 7273, Equipes †CMO and ‡CT, 13397 Cedex 20, Marseille, France
| | - Didier Siri
- Aix-Marseille
Université, CNRS, Institut de Chimie Radicalaire, UMR 7273, Equipes †CMO and ‡CT, 13397 Cedex 20, Marseille, France
| | - Michèle P. Bertrand
- Aix-Marseille
Université, CNRS, Institut de Chimie Radicalaire, UMR 7273, Equipes †CMO and ‡CT, 13397 Cedex 20, Marseille, France
| | - Laurence Feray
- Aix-Marseille
Université, CNRS, Institut de Chimie Radicalaire, UMR 7273, Equipes †CMO and ‡CT, 13397 Cedex 20, Marseille, France
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20
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Maury J, Jammi S, Vibert F, Marque SRA, Siri D, Feray L, Bertrand M. EPR Investigation of Zinc/Iodine Exchange between Propargyl Iodides and Diethylzinc: Detection of Propargyl Radical by Spin Trapping. J Org Chem 2012; 77:9081-6. [DOI: 10.1021/jo301562r] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Affiliation(s)
- Julien Maury
- Equipes CMO, ‡CT,
and §SREP, Aix-Marseille Université, CNRS, Institut de Chimie Radicalaire UMR 7273, 13397 Cedex 20, Marseille,
France
| | - Suribabu Jammi
- Equipes CMO, ‡CT,
and §SREP, Aix-Marseille Université, CNRS, Institut de Chimie Radicalaire UMR 7273, 13397 Cedex 20, Marseille,
France
| | - François Vibert
- Equipes CMO, ‡CT,
and §SREP, Aix-Marseille Université, CNRS, Institut de Chimie Radicalaire UMR 7273, 13397 Cedex 20, Marseille,
France
| | - Sylvain R. A. Marque
- Equipes CMO, ‡CT,
and §SREP, Aix-Marseille Université, CNRS, Institut de Chimie Radicalaire UMR 7273, 13397 Cedex 20, Marseille,
France
| | - Didier Siri
- Equipes CMO, ‡CT,
and §SREP, Aix-Marseille Université, CNRS, Institut de Chimie Radicalaire UMR 7273, 13397 Cedex 20, Marseille,
France
| | - Laurence Feray
- Equipes CMO, ‡CT,
and §SREP, Aix-Marseille Université, CNRS, Institut de Chimie Radicalaire UMR 7273, 13397 Cedex 20, Marseille,
France
| | - Michèle Bertrand
- Equipes CMO, ‡CT,
and §SREP, Aix-Marseille Université, CNRS, Institut de Chimie Radicalaire UMR 7273, 13397 Cedex 20, Marseille,
France
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21
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Yamada KI, Konishi T, Nakano M, Fujii S, Cadou R, Yamamoto Y, Tomioka K. Radical One-Pot α,β-Dual and β-Mono-Oxymethylation of Alkylidenemalonate. J Org Chem 2012; 77:5775-80. [DOI: 10.1021/jo300944f] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Affiliation(s)
- Ken-ichi Yamada
- Graduate School of Pharmaceutical
Sciences, Kyoto University, Yoshida, Sakyo,
Kyoto 606-8501, Japan
| | - Takehito Konishi
- Graduate School of Pharmaceutical
Sciences, Kyoto University, Yoshida, Sakyo,
Kyoto 606-8501, Japan
| | - Mayu Nakano
- Graduate School of Pharmaceutical
Sciences, Kyoto University, Yoshida, Sakyo,
Kyoto 606-8501, Japan
| | - Shintaro Fujii
- Graduate School of Pharmaceutical
Sciences, Kyoto University, Yoshida, Sakyo,
Kyoto 606-8501, Japan
| | - Romain Cadou
- Graduate School of Pharmaceutical
Sciences, Kyoto University, Yoshida, Sakyo,
Kyoto 606-8501, Japan
| | - Yasutomo Yamamoto
- Faculty
of Pharmaceutical Sciences, Doshisha Women’s College of Liberal Arts, Kodo,
Kyotanabe 610-0395, Japan
| | - Kiyoshi Tomioka
- Faculty
of Pharmaceutical Sciences, Doshisha Women’s College of Liberal Arts, Kodo,
Kyotanabe 610-0395, Japan
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22
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Maury J, Mouysset D, Feray L, Marque SRA, Siri D, Bertrand MP. Aminomethylation of Michael acceptors: complementary radical and polar approaches mediated by dialkylzincs. Chemistry 2012; 18:3241-7. [PMID: 22328494 DOI: 10.1002/chem.201102366] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2011] [Revised: 11/14/2011] [Indexed: 11/10/2022]
Abstract
Phtalimidomethyl iodide and substituted maleimidomethyl iodide were used as radical precursors in dialkylzinc-mediated radical addition to diethyl fumarate. The reactions led stereoselectively to functionalized pyrrolizidines. The radical mechanism was supported by spin-trapping experiments and rationalized by theoretical calculations. Radical additions, on the one hand, and carbozincation followed by transmetalation with copper(I), on the other, were shown to be complementary methods to achieve the formal aminomethylation of activated unsaturated compounds.
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Affiliation(s)
- Julien Maury
- Institut de Chimie Radicalaire, UMR 7273, Faculté des Sciences et Techniques de Saint-Jérôme, Avenue Normandie-Niemen, Aix-Marseille Université, 13397 Marseille Cedex 20, France
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