1
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Zhi S, Ma X, Zhang W. Radical Cyclization-Initiated Difunctionalization Reactions of Alkenes and Alkynes. Molecules 2024; 29:2559. [PMID: 38893437 PMCID: PMC11173560 DOI: 10.3390/molecules29112559] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2024] [Revised: 05/23/2024] [Accepted: 05/25/2024] [Indexed: 06/21/2024] Open
Abstract
Radical reactions are powerful in the synthesis of diverse molecular scaffolds bearing functional groups. In previous review articles, we have presented 1,2-difunctionalizations, remote 1,3-, 1,4-, 1,5-, 1,6- and 1,7-difunctionalizations, and addition followed by cyclization reactions. Presented in this paper is radical cyclization followed by the second functionalization reaction. The second functionalization could be realized by atom transfer reactions, radical or transition metal-assisted coupling reactions, and reactions with neutral molecules, cationic and anionic species.
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Affiliation(s)
- Sanjun Zhi
- Jiangsu Key Laboratory for the Chemistry of Low-Dimensional Materials, Huaiyin Normal University, 111 Changjiang West Road, Huaian 223300, China;
| | - Xiaoming Ma
- School of Pharmacy, Changzhou University, 1 Gehu Road, Changzhou 213164, China;
| | - Wei Zhang
- Department of Chemistry, University of Massachusetts Boston, 100 Morrissey Boulevard, Boston, MA 02125, USA
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2
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de Andrade Horn P, Sims HS, Dai M. Nickel-Catalyzed Tandem Ueno-Stork Cyclization: Stereoselective 1,2-Dicarbofunctionalization of Cyclic Alkenes. J Org Chem 2022; 87:8796-8801. [PMID: 35732004 DOI: 10.1021/acs.joc.2c00770] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A nickel-catalyzed tandem Ueno-Stork cyclization is developed to enable stereoselective 1,2-dicarbofunctionalization of cyclic alkenes and efficiently build various bicyclic products. This new protocol does not involve any toxic or difficult-to-remove tin reagent and is scalable and amenable to build all-carbon quaternary centers.
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Affiliation(s)
- Pedro de Andrade Horn
- Department of Chemistry and Center for Cancer Research, Purdue University, West Lafayette, Indiana 47907, United States
| | - Hunter S Sims
- Department of Chemistry and Center for Cancer Research, Purdue University, West Lafayette, Indiana 47907, United States
| | - Mingji Dai
- Department of Chemistry and Center for Cancer Research, Purdue University, West Lafayette, Indiana 47907, United States
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3
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Sun Z, Yao J, Ji S, Zhou W, Wang A, He M, Hua X, Liu Y. FeCl 2/TBAC efficiently catalyzes domino coupling reactions for constructing indoline-fused tetrahydroisoquinolines. NEW J CHEM 2022. [DOI: 10.1039/d2nj04177d] [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
FeCl2/TBAC has been found to be highly active for the construction of indoline-fused tetrahydroisoquinolines using aryltetrahydroisoquinolines and active methylene as simple reactants via two coupling reactions in a single step.
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Affiliation(s)
- Zhonghua Sun
- Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology, Changzhou University, Changzhou 213164, China
| | - Jie Yao
- Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology, Changzhou University, Changzhou 213164, China
| | - Shuliang Ji
- Jiangsu Yabang Dyestuff Co., LTD, Changzhou 213163, China
| | - Weiyou Zhou
- Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology, Changzhou University, Changzhou 213164, China
- Jiangsu Key Laboratory of Biomass Energy and Material, Nanjing 210037, Jiangsu Province, China
| | - Anwei Wang
- Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology, Changzhou University, Changzhou 213164, China
| | - Mingyang He
- Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology, Changzhou University, Changzhou 213164, China
| | - Xianjun Hua
- Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology, Changzhou University, Changzhou 213164, China
| | - Yupeng Liu
- Jiangsu Key Laboratory of Biomass Energy and Material, Nanjing 210037, Jiangsu Province, China
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4
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Kim R, Kwon K, Lee HY. A Free Radical Cyclization Catalyzed by Ruthenium Hydride Species. Chem Asian J 2021; 16:3909-3913. [PMID: 34637182 DOI: 10.1002/asia.202101023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2021] [Revised: 10/11/2021] [Indexed: 11/10/2022]
Abstract
A photolytically generated ruthenium hydride species catalyzing a free radical cyclization reaction was developed. As the new methodology ensures reproducibility of the free radical reaction of trialkyltin hydrides and a fast hydrogen transfer to the radical intermediates, the methodology provides fast quenching of radical intermediates and thus suppresses rearrangement of radical intermediates before the hydride quench. By offering new reactivity and selectivity to the trialkyltin hydride mediated free radical cyclization reactions, the methodology will find wide range of applications in organic synthesis.
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Affiliation(s)
- Rira Kim
- Department of Chemistry, Korea Advanced Institute of Science & Technology (KAIST), 134141, 291 Daehak Ro, Yuseong, Daejeon, Korea
| | - Kuktae Kwon
- Department of Chemistry, Korea Advanced Institute of Science & Technology (KAIST), 134141, 291 Daehak Ro, Yuseong, Daejeon, Korea
| | - Hee-Yoon Lee
- Department of Chemistry, Korea Advanced Institute of Science & Technology (KAIST), 134141, 291 Daehak Ro, Yuseong, Daejeon, Korea
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5
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Wuttig A, Derrick JS, Loipersberger M, Snider A, Head-Gordon M, Chang CJ, Toste FD. Controlled Single-Electron Transfer via Metal-Ligand Cooperativity Drives Divergent Nickel-Electrocatalyzed Radical Pathways. J Am Chem Soc 2021; 143:6990-7001. [PMID: 33915049 PMCID: PMC10877625 DOI: 10.1021/jacs.1c01487] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Electrocatalysis enables the construction of C-C bonds under mild conditions via controlled formation of carbon-centered radicals. For sequences initiated by alkyl halide reduction, coordinatively unsaturated Ni complexes commonly serve as single-electron transfer agents, giving rise to the foundational question of whether outer- or inner-sphere electron transfer oxidative addition prevails in redox mediation. Indeed, rational design of electrochemical processes requires the discrimination of these two electron transfer pathways, as they can have outsized effects on the rate of substrate bond activation and thus impact radical generation rates and downstream product selectivities. We present results from combined synthetic, electroanalytical, and computational studies that examine the mechanistic differences of single electron transfer to alkyl halides imparted by Ni metal-ligand cooperativity. Electrogenerated reduced Ni species, stabilized by delocalized spin density onto a redox-active tpyPY2Me polypyridyl ligand, activates alkyl iodides via outer-sphere electron transfer, allowing for the selective activation of alkyl iodide substrates over halogen atom donors and the controlled generation and sequestration of electrogenerated radicals. In contrast, the Ni complex possessing a redox-innocent pentapyridine congener activates the substrates in an inner-sphere fashion owning to a purely metal-localized spin, thereby activating both substrates and halogen atom donors in an indiscriminate fashion, generating a high concentration of radicals and leading to unproductive dimerization. Our data establish that controlled electron transfer via Ni-ligand cooperativity can be used to limit undesired radical recombination products and promote selective radical processes in electrochemical environments, providing a generalizable framework for designing redox mediators with distinct rate and potential requirements.
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Affiliation(s)
- Anna Wuttig
- Department of Chemistry, University of California, Berkeley, California, U.S.A
| | - Jeffrey S. Derrick
- Department of Chemistry, University of California, Berkeley, California, U.S.A
| | - Matthias Loipersberger
- Pitzer Center for Theoretical Chemistry, Department of Chemistry, University of California, Berkeley, California, U.S.A
| | - Andrew Snider
- Pitzer Center for Theoretical Chemistry, Department of Chemistry, University of California, Berkeley, California, U.S.A
| | - Martin Head-Gordon
- Pitzer Center for Theoretical Chemistry, Department of Chemistry, University of California, Berkeley, California, U.S.A
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California, USA
| | - Christopher J. Chang
- Department of Chemistry, University of California, Berkeley, California, U.S.A
- Department of Molecular and Cell Biology, University of California, Berkeley, California, U.S.A
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California, USA
| | - F. Dean Toste
- Department of Chemistry, University of California, Berkeley, California, U.S.A
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California, USA
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6
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Park DY, Hwang JY, Kang EJ. Fe(
III
)‐catalyzed Oxidative Povarov Reaction with Molecular Oxygen Oxidant. B KOREAN CHEM SOC 2021. [DOI: 10.1002/bkcs.12273] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Du Yong Park
- Department of Applied Chemistry Kyung Hee University Yongin 17104 Korea
| | - Joon Young Hwang
- Department of Applied Chemistry Kyung Hee University Yongin 17104 Korea
| | - Eun Joo Kang
- Department of Applied Chemistry Kyung Hee University Yongin 17104 Korea
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7
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Kalaitzakis D, Bosveli A, Sfakianaki K, Montagnon T, Vassilikogiannakis G. Multi-Photocatalyst Cascades: Merging Singlet Oxygen Photooxygenations with Photoredox Catalysis for the Synthesis of Alkaloid Frameworks. Angew Chem Int Ed Engl 2021; 60:4335-4341. [PMID: 33119205 DOI: 10.1002/anie.202012379] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2020] [Revised: 10/02/2020] [Indexed: 12/13/2022]
Abstract
The development of photocascades that rapidly transform simple and readily accessible furan substrates into polycyclic alkaloid frameworks or erythrina natural products is described. Each of the sequences developed makes use of photocatalyzed energy transfer processes, which generate singlet oxygen, to set up the substrates for the second photocatalyzed reaction, wherein electron transfer generates carbon-centered radicals for the cyclizations that give the final complex frameworks. A chemical switch has been developed that can "switch off" one photocatalyst; thus, allowing a second photocatalyst to take over control of the sequence. As a corollary, this strategy represents the first time it has been possible to use multiple photocatalysts in photocascades, and, as such, it expands significantly the reactions that can be included in such cascades and the order in which they can be initiated.
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Affiliation(s)
- Dimitris Kalaitzakis
- Department of Chemistry, University of Crete, Vasilika Vouton, 71003, Iraklion, Crete, Greece
| | - Artemis Bosveli
- Department of Chemistry, University of Crete, Vasilika Vouton, 71003, Iraklion, Crete, Greece
| | - Kalliopi Sfakianaki
- Department of Chemistry, University of Crete, Vasilika Vouton, 71003, Iraklion, Crete, Greece
| | - Tamsyn Montagnon
- Department of Chemistry, University of Crete, Vasilika Vouton, 71003, Iraklion, Crete, Greece
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8
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Kalaitzakis D, Bosveli A, Sfakianaki K, Montagnon T, Vassilikogiannakis G. Multi‐Photocatalyst Cascades: Merging Singlet Oxygen Photooxygenations with Photoredox Catalysis for the Synthesis of Alkaloid Frameworks. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202012379] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Dimitris Kalaitzakis
- Department of Chemistry University of Crete Vasilika Vouton 71003 Iraklion Crete Greece
| | - Artemis Bosveli
- Department of Chemistry University of Crete Vasilika Vouton 71003 Iraklion Crete Greece
| | - Kalliopi Sfakianaki
- Department of Chemistry University of Crete Vasilika Vouton 71003 Iraklion Crete Greece
| | - Tamsyn Montagnon
- Department of Chemistry University of Crete Vasilika Vouton 71003 Iraklion Crete Greece
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9
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Roslan II, Zhang H, Ng K, Jaenicke S, Chuah G. A Visible Light and Iron‐mediated Carbocationic Route to Polysubstituted 1‐Halonaphthalenes by Benzannulation using Allylbenzenes and Polyhalomethanes. Adv Synth Catal 2021. [DOI: 10.1002/adsc.202001249] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Irwan Iskandar Roslan
- Department of Chemistry National University of Singapore 3 Science Drive 3 Singapore 117543 Fax
| | - Hongwei Zhang
- Department of Chemistry National University of Singapore 3 Science Drive 3 Singapore 117543 Fax
| | - Kian‐Hong Ng
- Department of Chemistry National University of Singapore 3 Science Drive 3 Singapore 117543 Fax
| | - Stephan Jaenicke
- Department of Chemistry National University of Singapore 3 Science Drive 3 Singapore 117543 Fax
| | - Gaik‐Khuan Chuah
- Department of Chemistry National University of Singapore 3 Science Drive 3 Singapore 117543 Fax
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10
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Smoleń S, Wincenciuk A, Gryko D, Drapała O. Vitamin B12-Catalyzed Dicarbofunctionalization of Bromoalkenes Under Visible Light Irradiation. SYNTHESIS-STUTTGART 2020. [DOI: 10.1055/s-0040-1706602] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
AbstractVitamin B12 plays a crucial role in enzymatic transformations. This natural compound proved also useful as a catalyst in numerous organic reactions. Commercial availability and lower cost than precious metal complexes, make cobalamin an attractive candidate for a broader use as a benign Co-catalyst. Herein, the vitamin B12-catalyzed dicarbofuntionalization of bromoalkenes with electrophilic olefins is reported leading to substituted pyrrolidines and piperidines in decent yields after only 15 minutes under light irradiation.
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Affiliation(s)
- Sabina Smoleń
- Institute of Organic Chemistry, Polish Academy of Sciences
| | | | - Dorota Gryko
- Institute of Organic Chemistry, Polish Academy of Sciences
| | - Olga Drapała
- Institute of Organic Chemistry, Polish Academy of Sciences
- Faculty of Chemistry, Warsaw University of Technology
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11
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Wu F, Wang L, Ji Y, Zou G, Shen H, Nicewicz DA, Chen J, Huang Y. Direct Synthesis of Bicyclic Acetals via Visible Light Catalysis. iScience 2020; 23:101395. [PMID: 32759056 PMCID: PMC7404572 DOI: 10.1016/j.isci.2020.101395] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2020] [Revised: 06/26/2020] [Accepted: 07/17/2020] [Indexed: 11/28/2022] Open
Abstract
Polysubstituted bicyclic acetals are a class of privileged pharmacophores with a unique 3D structure and an adjacent pair of hydrogen bond acceptors. The key, fused acetal functionality is often assembled, via intramolecular cyclization, from linear substrates that are not readily available. Herein, we report a formal cycloaddition between cinnamyl alcohols and cyclic enol ethers under ambient photoredox catalysis conditions. Polysubstituted bicyclic acetals can be prepared in one step from readily available building blocks. Employment of sugar-derived enol ethers allows easy access to a library of scaffolds with intriguing conformation and medicinal chemistry potential. Synergistic catalysis of photocatalyst and HAT reagent 5/5, 5/6, 5/7, 6/6 bicyclic acetals and polysubstituted THF formed in one step High stability of bicyclic acetal in SIF and SGF
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Affiliation(s)
- Fengjin Wu
- State Key Laboratory of Chemical Oncogenomics, Key Laboratory of Chemical Genomics, Peking University, Shenzhen Graduate School, Shenzhen 518055, China
| | - Leifeng Wang
- State Key Laboratory of Chemical Oncogenomics, Key Laboratory of Chemical Genomics, Peking University, Shenzhen Graduate School, Shenzhen 518055, China; Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599-3290, USA
| | - Ying Ji
- Roche R&D Center (China) Ltd, 720 Cai Lun Road, Building 5, Shanghai 201203, China
| | - Ge Zou
- Roche R&D Center (China) Ltd, 720 Cai Lun Road, Building 5, Shanghai 201203, China
| | - Hong Shen
- Roche R&D Center (China) Ltd, 720 Cai Lun Road, Building 5, Shanghai 201203, China
| | - David A Nicewicz
- State Key Laboratory of Chemical Oncogenomics, Key Laboratory of Chemical Genomics, Peking University, Shenzhen Graduate School, Shenzhen 518055, China; Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599-3290, USA.
| | - Jiean Chen
- State Key Laboratory of Chemical Oncogenomics, Key Laboratory of Chemical Genomics, Peking University, Shenzhen Graduate School, Shenzhen 518055, China; Pingshan Translational Medicine Center, Shenzhen Bay Laboratory, Shenzhen 518055, China.
| | - Yong Huang
- State Key Laboratory of Chemical Oncogenomics, Key Laboratory of Chemical Genomics, Peking University, Shenzhen Graduate School, Shenzhen 518055, China; Pingshan Translational Medicine Center, Shenzhen Bay Laboratory, Shenzhen 518055, China.
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12
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Kyne SH, Lefèvre G, Ollivier C, Petit M, Ramis Cladera VA, Fensterbank L. Iron and cobalt catalysis: new perspectives in synthetic radical chemistry. Chem Soc Rev 2020; 49:8501-8542. [DOI: 10.1039/d0cs00969e] [Citation(s) in RCA: 44] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Iron and cobalt complexes are at the origin of high valuable synthetic pathways involving radical intemediates.
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Affiliation(s)
- Sara H. Kyne
- School of Chemistry
- Faculty of Science
- Monash University
- Clayton
- Australia
| | - Guillaume Lefèvre
- i-CLeHS CSB2D
- Chimie ParisTech
- 11 rue Pierre et Marie Curie
- FR 75005 Paris
- France
| | - Cyril Ollivier
- Sorbonne Université
- CNRS
- UMR8232
- Institut Parisien de Chimie Moléculaire
- F-75252 Paris Cedex 05
| | - Marc Petit
- Sorbonne Université
- CNRS
- UMR8232
- Institut Parisien de Chimie Moléculaire
- F-75252 Paris Cedex 05
| | | | - Louis Fensterbank
- Sorbonne Université
- CNRS
- UMR8232
- Institut Parisien de Chimie Moléculaire
- F-75252 Paris Cedex 05
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13
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Hwang JY, Ji AY, Lee SH, Kang EJ. Redox-Selective Iron Catalysis for α-Amino C-H Bond Functionalization via Aerobic Oxidation. Org Lett 2019; 22:16-21. [PMID: 31651180 DOI: 10.1021/acs.orglett.9b03542] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Single-electron oxidation and α-deprotonation of tertiary anilines using Fe(phen)3(PF6)3 afford α-aminoalkyl radicals, which can be coupled with electrophilic partners to afford various tetrahydroquinolines. Mechanistically, the Fe(phen)n2+/3+ catalytic cycle is maintained by O2 or a TBHP oxidant, and the presence of the oxygen bound iron complex, Fe(III)-OO(H), was elucidated by electron paramagnetic resonance and electrospray ionization mass spectrometry. This redox-selective nonheme iron catalyst behaves similarly to bioinspired heme iron catalysts.
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Affiliation(s)
- Joon Young Hwang
- Department of Applied Chemistry , Kyung Hee University , Yongin 17104 , Korea
| | - A Young Ji
- Department of Applied Chemistry , Kyung Hee University , Yongin 17104 , Korea
| | - Sang Hyeok Lee
- Department of Applied Chemistry , Kyung Hee University , Yongin 17104 , Korea
| | - Eun Joo Kang
- Department of Applied Chemistry , Kyung Hee University , Yongin 17104 , Korea
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14
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Affiliation(s)
- Yao Li
- Center of Basic Molecular Science (CBMS), Department of Chemistry, Tsinghua University, Beijing 100084, China
| | - Dehong Wang
- Key Laboratory of Molecular Recognition and Function, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
| | - Long Zhang
- Center of Basic Molecular Science (CBMS), Department of Chemistry, Tsinghua University, Beijing 100084, China
- Key Laboratory of Molecular Recognition and Function, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
| | - Sanzhong Luo
- Center of Basic Molecular Science (CBMS), Department of Chemistry, Tsinghua University, Beijing 100084, China
- Key Laboratory of Molecular Recognition and Function, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
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15
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16
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Pulikottil FT, Pilli R, Murugesan V, Krishnan CG, Rasappan R. A Free‐Radical Reduction and Cyclization of Alkyl Halides Mediated by FeCl
2. ChemCatChem 2019. [DOI: 10.1002/cctc.201900230] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Feba Thomas Pulikottil
- School of ChemistryIndian Institute of Science Education and Research Thiruvananthapuram Vithura, Thiruvananthapuram Kerala India
| | - Ramadevi Pilli
- School of ChemistryIndian Institute of Science Education and Research Thiruvananthapuram Vithura, Thiruvananthapuram Kerala India
| | - Vetrivelan Murugesan
- School of ChemistryIndian Institute of Science Education and Research Thiruvananthapuram Vithura, Thiruvananthapuram Kerala India
| | - Chandu G. Krishnan
- School of ChemistryIndian Institute of Science Education and Research Thiruvananthapuram Vithura, Thiruvananthapuram Kerala India
| | - Ramesh Rasappan
- School of ChemistryIndian Institute of Science Education and Research Thiruvananthapuram Vithura, Thiruvananthapuram Kerala India
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17
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Shin JH, Seong EY, Mun HJ, Jang YJ, Kang EJ. Electronically Mismatched Cycloaddition Reactions via First-Row Transition Metal, Iron(III)–Polypyridyl Complex. Org Lett 2018; 20:5872-5876. [DOI: 10.1021/acs.orglett.8b02541] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jung Ha Shin
- Department of Applied Chemistry, Kyung Hee University, Yongin 17104, Korea
| | - Eun Young Seong
- Department of Applied Chemistry, Kyung Hee University, Yongin 17104, Korea
| | - Hyeon Jin Mun
- Department of Applied Chemistry, Kyung Hee University, Yongin 17104, Korea
| | - Yu Jeong Jang
- Department of Applied Chemistry, Kyung Hee University, Yongin 17104, Korea
| | - Eun Joo Kang
- Department of Applied Chemistry, Kyung Hee University, Yongin 17104, Korea
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18
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19
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Hwang JY, Shin JH, Seong EY, Kang EJ. FeCl 2
-mediated Nucleophilic Chlorination of Iodoalkanes Accelerated by Phenanthroline Ligand. B KOREAN CHEM SOC 2018. [DOI: 10.1002/bkcs.11453] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Joon Young Hwang
- Department of Applied Chemistry; Kyung Hee University; Yongin 17104 South Korea
| | - Jung Ha Shin
- Department of Applied Chemistry; Kyung Hee University; Yongin 17104 South Korea
| | - Eun Young Seong
- Department of Applied Chemistry; Kyung Hee University; Yongin 17104 South Korea
| | - Eun Joo Kang
- Department of Applied Chemistry; Kyung Hee University; Yongin 17104 South Korea
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20
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Kuo JL, Lorenc C, Abuyuan JM, Norton JR. Catalysis of Radical Cyclizations from Alkyl Iodides under H 2: Evidence for Electron Transfer from [CpV(CO) 3H]<sup/>. J Am Chem Soc 2018; 140:4512-4516. [PMID: 29543448 PMCID: PMC6373875 DOI: 10.1021/jacs.8b02119] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
Radical cyclizations are most often achieved with Bu3SnH in the presence of a radical initiator, but environmental considerations demand that alternative reagents be developed-ones that can serve as a synthetic equivalent to the hydrogen atom. We have revisited [CpV(CO)3H]-, a known replacement for Bu3SnH, and found that it can be used catalytically under H2 in the presence of a base. We have carried out tin-free catalytic radical cyclizations of alkyl iodide substrates. The reactions are atom-efficient, and the conditions are mild, with broad tolerance for functional groups. We have, for example, achieved the first 5-exo radical cyclization involving attack onto a vinyl chloride. We suggest that the radicals are generated by an initial electron transfer.
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Affiliation(s)
- Jonathan L Kuo
- Department of Chemistry , Columbia University , 3000 Broadway , New York , New York 10027 , United States
| | - Chris Lorenc
- Department of Chemistry , Columbia University , 3000 Broadway , New York , New York 10027 , United States
| | - Janine M Abuyuan
- Department of Chemistry , Barnard College , 3009 Broadway , New York , New York 10027
| | - Jack R Norton
- Department of Chemistry , Columbia University , 3000 Broadway , New York , New York 10027 , United States
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21
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Gualandi A, Mengozzi L, Cozzi PG. Iron-Promoted Radical Reactions: Current Status and Perspectives. ASIAN J ORG CHEM 2017. [DOI: 10.1002/ajoc.201700151] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Andrea Gualandi
- Dipartimento di Chimica “G. Ciamician”; ALMA MATER STUDIORUM Università di Bologna; Via Selmi 2 40126 Bologna Italy
| | - Luca Mengozzi
- Dipartimento di Chimica “G. Ciamician”; ALMA MATER STUDIORUM Università di Bologna; Via Selmi 2 40126 Bologna Italy
| | - Pier Giorgio Cozzi
- Dipartimento di Chimica “G. Ciamician”; ALMA MATER STUDIORUM Università di Bologna; Via Selmi 2 40126 Bologna Italy
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22
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Mikhaylov AA, Zard SZ. Extension to the Silyl-Tethered Radical Cyclization: Cyclohex-2-en-1-oxy Vinyl Silanes in Stereoselective Radical Addition/Cyclization Cascades. Org Lett 2017; 19:1866-1869. [PMID: 28358488 DOI: 10.1021/acs.orglett.7b00627] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A novel radical cascade reaction of xanthates with 1-[(vinyldimethylsilyl)oxy]cyclohex-2-enes is developed. Due to the steric and electronic differentiation of the two olefinic functions, exclusive regioselectivity and high stereoselectivity of the addition-cyclization are observed. Several methods for modification of both the silicon tether and the xanthate function are reported.
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Affiliation(s)
- Andrey A Mikhaylov
- Laboratoire de Synthèse Organique, CNRS UMR 7652 Ecole Polytechnique , Palaiseau 91128 Cedex, France
| | - Samir Z Zard
- Laboratoire de Synthèse Organique, CNRS UMR 7652 Ecole Polytechnique , Palaiseau 91128 Cedex, France
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