1
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Kamimura A, Itaya T, Yoshinaga T, Nozawa R, Kawamoto T, Sumimoto M, Uno H. Highly Cumulated Radical Cascade Reaction of aza-1,6-Enyenes: Stereoselective Synthesis of exo
-Methylene Piperidines. European J Org Chem 2020. [DOI: 10.1002/ejoc.202000034] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Akio Kamimura
- Department Applied Chemistry; Yamaguchi University; 755-8611 Ube Japan
| | - Tomoyuki Itaya
- Department Applied Chemistry; Yamaguchi University; 755-8611 Ube Japan
| | - Tatsuro Yoshinaga
- Department Applied Chemistry; Yamaguchi University; 755-8611 Ube Japan
| | - Ryo Nozawa
- Department Applied Chemistry; Yamaguchi University; 755-8611 Ube Japan
| | - Takuji Kawamoto
- Department Applied Chemistry; Yamaguchi University; 755-8611 Ube Japan
| | - Michinori Sumimoto
- Department Environmental Chemistry; Yamaguchi University; 755-8611 Ube Japan
| | - Hidemitsu Uno
- Department of Chemistry; Ehime University; 790-8577 Matsuyama Japan
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2
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Abstract
We reported a visible-light-induced difluoroalkylation and cyclization cascade reaction of 1,8-enynes with broad substrate scopes in up to 92% isolated yields. This method provides a sustainable and efficient access to the synthesis of difluoroalkylated tetracyclic compounds under mild conditions.
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Affiliation(s)
- Honggui Huang
- Department of Chemistry, Fuzhou University , Fuzhou 350116, China
| | - Yi Li
- Department of Chemistry, Fuzhou University , Fuzhou 350116, China
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3
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Kamimura A, Miyazaki K, Kawamoto T, Uno H. A radical cascade reaction of aza-1,6-enyne compounds using allyltributyltin. Tetrahedron 2016. [DOI: 10.1016/j.tet.2016.04.078] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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4
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Song L, Fang X, Wang Z, Liu K, Li C. Stereoselectivity of 6-Exo Cyclization of α-Carbamoyl Radicals. J Org Chem 2016; 81:2442-50. [DOI: 10.1021/acs.joc.6b00008] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Liyan Song
- Key
Laboratory of Organofluorine Chemistry and Collaborative Innovation
Center of Chemistry for Life Sciences, Shanghai Institute of Organic
Chemistry, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, P. R. China
| | - Xinqiang Fang
- Key
Laboratory of Organofluorine Chemistry and Collaborative Innovation
Center of Chemistry for Life Sciences, Shanghai Institute of Organic
Chemistry, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, P. R. China
| | - Zijia Wang
- Key
Laboratory of Organofluorine Chemistry and Collaborative Innovation
Center of Chemistry for Life Sciences, Shanghai Institute of Organic
Chemistry, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, P. R. China
| | - Kun Liu
- College
of Chemistry, Tianjin Normal University, Tianjin 300387, P. R. China
| | - Chaozhong Li
- School
of Chemical Engineering, Ningbo University of Technology, No. 89
Cuibai Road, Ningbo 315016, P. R. China
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5
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Miyabe H, Yoshioka E, Kohtani S. Research and Development of Domino Radical Cyclization Reactions. J SYN ORG CHEM JPN 2015. [DOI: 10.5059/yukigoseikyokaishi.73.895] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Hideto Miyabe
- School of Pharmacy, Hyogo University of Health Sciences
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6
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Kamimura A, Yoshinaga T, Noguchi F, Miyazaki K, Uno H. A mechanistic study on the SHi reaction at tin atoms in a radical cascade reaction. Org Chem Front 2015. [DOI: 10.1039/c5qo00063g] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A kinetic study on the intramolecular direct radical substitution reaction on tin atoms was undertaken.
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Affiliation(s)
- Akio Kamimura
- Department of Applied Molecular Bioscience
- Graduate School of Medicine
- Yamaguchi University
- Ube 755-8611
- Japan
| | - Tatsuro Yoshinaga
- Department of Applied Chemistry
- Faculty of Engineering
- Yamaguchi University
- Ube 755-8611
- Japan
| | - Fumiaki Noguchi
- Department of Applied Molecular Bioscience
- Graduate School of Medicine
- Yamaguchi University
- Ube 755-8611
- Japan
| | - Koichiro Miyazaki
- Department of Applied Molecular Bioscience
- Graduate School of Medicine
- Yamaguchi University
- Ube 755-8611
- Japan
| | - Hidemitsu Uno
- Department of Chemistry
- Graduate School of Science and Engineering
- Ehime University
- Matsuyama 790-8577
- Japan
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7
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Kamimura A, Ishikawa S. A New Heterocyclic Synthesis Using Asymmetric aza-Morita-Baylis-Hillman Equivalent Reaction. J SYN ORG CHEM JPN 2014. [DOI: 10.5059/yukigoseikyokaishi.72.929] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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8
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Shirakawa S, Usui A, Kan SBJ, Maruoka K. Chiral Organotin Hydride Catalyzed Enantioselective Radical Cyclization of Aldehydes. ASIAN J ORG CHEM 2013. [DOI: 10.1002/ajoc.201300138] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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9
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Kamimura A, Miyazaki K, Yamane Y, Yo R, Ishikawa S, Uno H, Sumimoto M. A Radical Cascade Cyclization To Prepare Dihydrothiophenes Induced by Thiyl Radicals as Sulfur Biradical Equivalents. J Org Chem 2013; 78:7816-22. [DOI: 10.1021/jo400975t] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Akio Kamimura
- Department of Applied Molecular
Science, Graduate School of Medicine, Yamaguchi University, Ube 755-8611, Japan
| | - Koichiro Miyazaki
- Department of Applied Molecular
Science, Graduate School of Medicine, Yamaguchi University, Ube 755-8611, Japan
| | - Yu Yamane
- Department of Applied Molecular
Science, Graduate School of Medicine, Yamaguchi University, Ube 755-8611, Japan
| | - Ryuichiro Yo
- Department of Applied Molecular
Science, Graduate School of Medicine, Yamaguchi University, Ube 755-8611, Japan
| | - Shingo Ishikawa
- Department of Applied Molecular
Science, Graduate School of Medicine, Yamaguchi University, Ube 755-8611, Japan
| | - Hidemitsu Uno
- Department of Chemistry, Graduate
School of Science and Engineering, Ehime University, Matsuyama 790-8577, Japan
| | - Michinori Sumimoto
- Department of Material Chemistry,
Graduate School of Science and Engineering, Yamaguchi University, Ube 755-8611, Japan
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10
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Miyazaki K, Yamane Y, Yo R, Uno H, Kamimura A. Preparation of optically active bicyclodihydrosiloles by a radical cascade reaction. Beilstein J Org Chem 2013; 9:1326-32. [PMID: 23946827 PMCID: PMC3740799 DOI: 10.3762/bjoc.9.149] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2013] [Accepted: 06/18/2013] [Indexed: 12/03/2022] Open
Abstract
Bicyclodihydrosiloles were readily prepared from optically active enyne compounds by a radical cascade reaction triggered by tris(trimethylsilyl)silane ((Me3Si)3SiH). The reaction was initiated by the addition of a silyl radical to an α,β-unsaturated ester, forming an α-carbonyl radical that underwent radical cyclization to a terminal alkyne unit. The resulting vinyl radical attacked the silicon atom in an SHi manner to give dihydrosilole. The reaction preferentially formed trans isomers of bicyclosiloles with an approximately 7:3 to 9:1 selectivity.
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Affiliation(s)
- Koichiro Miyazaki
- Department of Applied Molecular Bioscience, Graduate School of Medicine, Yamaguchi University, Ube 755-8611, Japan
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11
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Kamimura A, Yamane Y, Uno H. Preparation of Optically Active 4-Aminopyrrolidines by Radical Addition/Cyclization to Chiral N-(2-(Methoxyimino)Ethyl)-β-Amino-α-Methylene Esters. PHOSPHORUS SULFUR 2013. [DOI: 10.1080/10426507.2012.736893] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Affiliation(s)
- Akio Kamimura
- a Department of Applied Molecular Bioscience , Graduate School of Medicine, Yamaguchi University , Ube , 755-8611 , Japan
| | - Yu Yamane
- a Department of Applied Molecular Bioscience , Graduate School of Medicine, Yamaguchi University , Ube , 755-8611 , Japan
| | - Hidemitsu Uno
- b Department of Chemistry, Graduate School of Science and Engineering , Ehime University , Matsuyama , 790-8577 , Japan
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12
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Kamimura A, Kotake T, Ishihara Y, So M, Hayashi T. Kinetic Study of the 7-endo Selective Radical Cyclization of N-tert-Butyl-o-bromobenzylmethacryl Amides: Kinetic Investigation of the Cyclization and 1,7-Hydrogen Transfer of Aromatic Radicals. J Org Chem 2013; 78:3961-71. [DOI: 10.1021/jo400326b] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Akio Kamimura
- Department of Applied Molecular Bioscience,
Graduate
School of Medicine, Yamaguchi University, Ube 755-8611, Japan
| | - Tomoko Kotake
- Department of Applied Molecular Bioscience,
Graduate
School of Medicine, Yamaguchi University, Ube 755-8611, Japan
| | - Yuriko Ishihara
- Department of Applied Molecular Bioscience,
Graduate
School of Medicine, Yamaguchi University, Ube 755-8611, Japan
| | - Masahiro So
- Department of Applied Molecular Bioscience,
Graduate
School of Medicine, Yamaguchi University, Ube 755-8611, Japan
| | - Takahiro Hayashi
- Department of Applied Molecular Bioscience,
Graduate
School of Medicine, Yamaguchi University, Ube 755-8611, Japan
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13
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Yoshioka E, Kohtani S, Sawai K, Kentefu, Tanaka E, Miyabe H. Polarity-mismatched addition of electrophilic carbon radicals to an electron-deficient acceptor: cascade radical addition-cyclization-trapping reaction. J Org Chem 2012; 77:8588-604. [PMID: 22963515 DOI: 10.1021/jo3015227] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The polarity-mismatched perfluoroalkyl radical addition to electron-deficient alkenes was studied. For this study, several substrates having two polarity-different radical acceptors were employed to investigate the regiochemical courses of cascade reaction. In the case of substrate 1 having a methacryloyl moiety, we found polarity-mismatched perfluoroalkylation giving 15a-e as a major course over the polarity-matched perfluoroalkylation giving 16a-e. Moreover, in the case of substrates 2-7, perfluoroalkyl radicals selectively added to an electron-deficient alkene moiety of 2-7, to give polarity-mismatched perfluoroalkylation products without the formation of regioisomers. Next, the control of enantioselectivity was studied. In the case of substrates 1 and 3, the reaction proceeded with good enantioselectivities by employing a chiral Lewis acid, prepared from chiral box ligand 24 and Zn(OTf)(2). For direct comparison, we also studied the reaction with other carbon radicals, derived from ICH(2)CO(2)Et, ICH(2)CN, BrC(CO(2)Et)(2)Me, and CCl(3)Br, which have electrophilic character.
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Affiliation(s)
- Eito Yoshioka
- School of Pharmacy, Hyogo University of Health Sciences, Minatojima, Chuo-ku, Kobe 650-8530, Japan
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14
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Miyabe H, Asada R, Takemoto Y. Lewis acid-mediated radical cyclization: stereocontrol in cascade radical addition-cyclization-trapping reactions. Org Biomol Chem 2012; 10:3519-30. [PMID: 22434240 DOI: 10.1039/c2ob25073j] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An efficient approach for achieving radical cyclizations by using hydroxamate ester as a coordination tether with Lewis acid was studied. The chiral Lewis acid-mediated cascade radical addition-cyclization-trapping reaction proceeded smoothly with good enantio- and diastereoselectivities, providing various chiral γ-lactams.
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Affiliation(s)
- Hideto Miyabe
- Graduate School of Pharmaceutical Sciences, Kyoto University, Yoshida, Sakyo-ku, Kyoto 606-8501, Japan.
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15
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Kamimura A, Ishikawa S, Noguchi F, Moriyama T, So M, Murafuji T, Uno H. Unexpected formation of stannolanes and trigonal bipyramidal tin complexes by radical cyclization reaction. Chem Commun (Camb) 2012; 48:6592-4. [DOI: 10.1039/c2cc31753b] [Citation(s) in RCA: 17] [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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16
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Pham PV, Ashton K, MacMillan DWC. The Intramolecular Asymmetric Allylation of Aldehydes via Organo-SOMO Catalysis: A Novel Approach to Ring Construction. Chem Sci 2011; 2:1470-1473. [PMID: 23087809 PMCID: PMC3474369 DOI: 10.1039/c1sc00176k] [Citation(s) in RCA: 71] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The intramolecular asymmetric cyclization of aldehydes has been accomplished using singly occupied molecular orbital (SOMO) catalysis. Selective oxidation of chiral enamines (formed by the condensation of an aldehyde and a secondary amine catalyst) leads to the formation of a 3π-electron radical species. These chiral SOMO-activated radical cations undergo enantioselective cyclization with an array of pendent allylsilanes thus efficiently providing a new approach to the construction of five-, six- and seven-membered carbocycles and heterocycles.
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Affiliation(s)
- Phong V. Pham
- Merck Center for Catalysis at Princeton University, Princeton, New Jersey, 08544, USA; Fax: +1 609 2585922; Tel: +1 609 2582254
| | - Kate Ashton
- Merck Center for Catalysis at Princeton University, Princeton, New Jersey, 08544, USA; Fax: +1 609 2585922; Tel: +1 609 2582254
| | - David W. C. MacMillan
- Merck Center for Catalysis at Princeton University, Princeton, New Jersey, 08544, USA; Fax: +1 609 2585922; Tel: +1 609 2582254
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17
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Radical cyclizations of acylsilanes in the synthesis of (+)-swainsonine and formal synthesis of (−)-epiquinamide. Tetrahedron 2011. [DOI: 10.1016/j.tet.2010.12.048] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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18
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Jahn U. Radicals in transition metal catalyzed reactions? transition metal catalyzed radical reactions? a fruitful interplay anyway: part 1. Radical catalysis by group 4 to group 7 elements. Top Curr Chem (Cham) 2011; 320:121-89. [PMID: 22025066 DOI: 10.1007/128_2011_261] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
This review summarizes the current status of radical-based transition metal catalyzed reactions in organic chemistry. The underlying features of radical generation from transition metal complexes and radical reactivity in the framework of transition metal catalysis are discussed. The available arsenal to detect radicals in transition metal catalyzed transformations is presented. Available strategies to combine radical intermediates with transition metal catalysis are outlined. In the main part the currently known synthetic methodology of transition metal catalyzed reactions proceeding via radical intermediates is discussed. This part covers catalytic radical reactions involving group 4 to group 7 elements.
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Affiliation(s)
- Ullrich Jahn
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, Flemingovo namesti 2, 16610, Prague 6, Czech Republic.
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