1
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Wei X, Zhang Y, Zhang JJ, Fang W, Chen Z. Solvent-Controllable C-F Bond Activation for Masked Formylation of α-Trifluoromethyl Alkenes via Organo-Photoredox Catalysis. J Org Chem 2024; 89:624-632. [PMID: 38115588 DOI: 10.1021/acs.joc.3c02385] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2023]
Abstract
A solvent-controllable organo-photoredox-catalyzed C-F bond activation for masked formylation of α-trifluoromethyl alkenes with low-priced 1,3-dioxolane as masked formyl radical equivalent has been described. Consequently, a diversity of masked formylated gem-difluoroalkenes and monofluoroalkenes are constructed in moderate to high yields. This approach merits readily available starting materials, mild reaction conditions, and broad substrate scope. The feasibility of this approach has been highlighted by the one-pot masked formylation/hydrolysis sequence to form γ,γ-difluoroallylic aldehydes and late-stage modification of pharmaceutical and natural product derivatives.
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Affiliation(s)
- Xian Wei
- Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Jiangsu Provincial Key Lab for the Chemistry and Utilization of Agro-Forest Biomass, Jiangsu Key Lab of Biomass-Based Green Fuels and Chemicals, International Innovation Center for Forest Chemicals and Materials, College of Chemical Engineering, Nanjing Forestry University, Nanjing, Jiangsu 210037, China
| | - Yue Zhang
- Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Jiangsu Provincial Key Lab for the Chemistry and Utilization of Agro-Forest Biomass, Jiangsu Key Lab of Biomass-Based Green Fuels and Chemicals, International Innovation Center for Forest Chemicals and Materials, College of Chemical Engineering, Nanjing Forestry University, Nanjing, Jiangsu 210037, China
| | - Jing-Jing Zhang
- Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Jiangsu Provincial Key Lab for the Chemistry and Utilization of Agro-Forest Biomass, Jiangsu Key Lab of Biomass-Based Green Fuels and Chemicals, International Innovation Center for Forest Chemicals and Materials, College of Chemical Engineering, Nanjing Forestry University, Nanjing, Jiangsu 210037, China
| | - Weiwei Fang
- Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Jiangsu Provincial Key Lab for the Chemistry and Utilization of Agro-Forest Biomass, Jiangsu Key Lab of Biomass-Based Green Fuels and Chemicals, International Innovation Center for Forest Chemicals and Materials, College of Chemical Engineering, Nanjing Forestry University, Nanjing, Jiangsu 210037, China
| | - Zhen Chen
- Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Jiangsu Provincial Key Lab for the Chemistry and Utilization of Agro-Forest Biomass, Jiangsu Key Lab of Biomass-Based Green Fuels and Chemicals, International Innovation Center for Forest Chemicals and Materials, College of Chemical Engineering, Nanjing Forestry University, Nanjing, Jiangsu 210037, China
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2
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Feng J, Wang Q, Duan R, Li H, Zheng K, Wang X, Xie G. A facile electrosynthesis of N-acyl benzotriazoles from aldehydes and benzotriazole. Tetrahedron Lett 2022. [DOI: 10.1016/j.tetlet.2022.153904] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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3
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Bromine radical as a visible-light-mediated polarity-reversal catalyst. iScience 2021; 24:102693. [PMID: 34222843 PMCID: PMC8243021 DOI: 10.1016/j.isci.2021.102693] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2021] [Revised: 05/12/2021] [Accepted: 06/03/2021] [Indexed: 11/28/2022] Open
Abstract
Polarity-reversal catalysts enable otherwise sluggish or completely ineffective reactions which are characterized by unfavorable polar effects between radicals and substrates. We herein disclose that when irradiated by visible light, bromine can behave as a polarity-reversal catalyst. Hydroacylation of vinyl arenes, a three-component cascade transformation and deuteration of aldehydes were each achieved in a metal-free manner without initiators by using inexpensive N-bromosuccinimide as the precatalyst. Light is essential to generate and maintain the active bromine radical during the reaction process. Another key to success is that HBr can behave as an effective hydrogen donor to turn over the catalytic cycles. Using bromine as a polarity-reversal catalyst to generate acyl radicals Additive- and metal-free, atom- and step-economic, and operationally simple process Using constant light-irradiation to induce and maintain bromine radicals Access carbonyl compounds and deuterated aldehydes with wide substrate scope
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4
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Wang M, Liang G, Wang Y, Fan T, Yuan B, Liu M, Yin Y, Li L. Merging N-Hydroxyphthalimide into Metal-Organic Frameworks for Highly Efficient and Environmentally Benign Aerobic Oxidation. Chemistry 2021; 27:9674-9685. [PMID: 33971051 DOI: 10.1002/chem.202100987] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2021] [Indexed: 11/05/2022]
Abstract
Two highly efficient metal-organic framework catalysts TJU-68-NHPI and TJU-68-NDHPI have been successfully synthesized through solvothermal reactions of which the frameworks are merged with N-hydroxyphthalimide (NHPI) units, resulting in the decoration of pore surfaces with highly active nitroxyl catalytic sites. When t-butyl nitrite (TBN) is used as co-catalyst, the as-synthesized MOFs are demonstrated to be highly efficient and recyclable catalysts for a novel three-phase heterogeneous oxidation of activated C-H bond of primary and secondary alcohols, and benzyl compounds under mild conditions. Based on the high efficiency and selectivity, an environmentally benign system with good sustainability, mild conditions, simple work-up procedure has been established for practical oxidation of a wide range of substrates.
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Affiliation(s)
- Man Wang
- Shanghai Key Lab of Chemical Assessment and Sustainability, School of Chemical Science and Engineering, Tongji University, Shanghai, 200092, P. R. China
| | - Gan Liang
- Shanghai Key Lab of Chemical Assessment and Sustainability, School of Chemical Science and Engineering, Tongji University, Shanghai, 200092, P. R. China
| | - Yunhao Wang
- Shanghai Key Lab of Chemical Assessment and Sustainability, School of Chemical Science and Engineering, Tongji University, Shanghai, 200092, P. R. China
| | - Tao Fan
- Shanghai Key Lab of Chemical Assessment and Sustainability, School of Chemical Science and Engineering, Tongji University, Shanghai, 200092, P. R. China
| | - Baoling Yuan
- Shanghai Key Lab of Chemical Assessment and Sustainability, School of Chemical Science and Engineering, Tongji University, Shanghai, 200092, P. R. China
| | - Mingxian Liu
- Shanghai Key Lab of Chemical Assessment and Sustainability, School of Chemical Science and Engineering, Tongji University, Shanghai, 200092, P. R. China
| | - Ying Yin
- Shanghai Key Lab of Chemical Assessment and Sustainability, School of Chemical Science and Engineering, Tongji University, Shanghai, 200092, P. R. China
| | - Liangchun Li
- Shanghai Key Lab of Chemical Assessment and Sustainability, School of Chemical Science and Engineering, Tongji University, Shanghai, 200092, P. R. China
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5
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Hayakawa M, Shirota H, Hirayama S, Yamada R, Aoyama T, Ouchi A. Sunlight-induced C C bond formation reaction: Radical addition of alcohols/ethers/acetals to olefins. J Photochem Photobiol A Chem 2021. [DOI: 10.1016/j.jphotochem.2021.113263] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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6
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Paul S, Guin J. A General Approach to Intermolecular Olefin Hydroacylation through Light-Induced HAT Initiation: An Efficient Synthesis of Long-Chain Aliphatic Ketones and Functionalized Fatty Acids. Chemistry 2021; 27:4412-4419. [PMID: 33350515 DOI: 10.1002/chem.202004946] [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: 11/13/2020] [Indexed: 12/17/2022]
Abstract
Herein, an operationally simple, environmentally benign and effective method for intermolecular radical hydroacylation of unactivated substrates by employing photo-induced hydrogen atom transfer (HAT) initiation is described. The use of commercially available and inexpensive photoinitiators (Ph2 CO and NHPI) makes the process attractive. The olefin hydroacylation protocol applies to a wide array of substrates bearing numerous functional groups and many complex structural units. The reaction proves to be scalable (up to 5 g). Different functionalized fatty acids, petrochemicals and naturally occurring alkanes can be synthesized with this protocol. A radical chain mechanism is implicated in the process.
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Affiliation(s)
- Subhasis Paul
- School of Chemical Sciences, Indian Association for the Cultivation of Science, 2A & 2B Raja S. C. Mullick Road, Jadavpur, Kolkata, 700032, India
| | - Joyram Guin
- School of Chemical Sciences, Indian Association for the Cultivation of Science, 2A & 2B Raja S. C. Mullick Road, Jadavpur, Kolkata, 700032, India
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7
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Hayakawa M, Shimizu R, Omori H, Shirota H, Uchida K, Mashimo H, Xu H, Yamada R, Niino S, Wakame Y, Liu C, Aoyama T, Ouchi A. Photochemical addition of cyclic ethers/acetals to olefins using BuOO Bu: Synthesis of masked ketones/aldehydes and diols. Tetrahedron 2020. [DOI: 10.1016/j.tet.2020.131557] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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8
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Wang Y, Chen X, Jin H, Wang Y. Mild and Practical Dirhodium(II)/NHPI-Mediated Allylic and Benzylic Oxidations with Air as the Oxidant. Chemistry 2019; 25:14273-14277. [PMID: 31361049 DOI: 10.1002/chem.201902739] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2019] [Revised: 07/28/2019] [Indexed: 11/08/2022]
Abstract
Aerobic allylic and benzylic oxidations catalyzed by dirhodium(II) complexes with N-hydroxyphthalimide (NHPI) are described. The open flask reaction occurs at mild temperature, using air as the oxidant. Mechanistic studies suggest that dirhodium(II) complexes axially coordinate with NHPI to activate the O-H bond in NHPI and decrease the bond-dissociation energy (BDE).
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Affiliation(s)
- Yi Wang
- Key Laboratory of Green Chemistry & Technology of Ministry of, Education, College of Chemistry, Sichuan University, Chengdu, 610064, P.R. China
| | - Xiaochuan Chen
- Key Laboratory of Green Chemistry & Technology of Ministry of, Education, College of Chemistry, Sichuan University, Chengdu, 610064, P.R. China
| | - Hong Jin
- Key Laboratory of Bio-Resource and Eco-Environment of Ministry of, Education, College of Life Sciences, Sichuan University, Chengdu, 610064, P.R. China
| | - Yuanhua Wang
- Key Laboratory of Green Chemistry & Technology of Ministry of, Education, College of Chemistry, Sichuan University, Chengdu, 610064, P.R. China
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9
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Łątka P, Berniak T, Drozdek M, Witek E, Kuśtrowski P. Formation of N-hydroxyphthalimide species in poly(vinyl-diisopropyl-phtalate ester-co-styrene-co-divinylbenzene) and its application in aerobic oxidation of p-methoxytoluene. CATAL COMMUN 2018. [DOI: 10.1016/j.catcom.2018.07.011] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022] Open
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10
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Joo SR, Kim JS, Park SY, Kim SH. Highly Active Manganese to CO Cross-Coupling Reaction for the Synthesis of N
-Hydroxyphthalimide Esters. B KOREAN CHEM SOC 2018. [DOI: 10.1002/bkcs.11461] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Seong-Ryu Joo
- Department of Chemistry; Dankook University; Cheonan 31116 South Korea
| | - Jong-Sung Kim
- Department of Chemistry; Dankook University; Cheonan 31116 South Korea
| | - Soo-Youl Park
- Interface Chemistry & Engineering Research Team; Korea Research Institute of Chemical Technology; 34114 South Korea
| | - Seung-Hoi Kim
- Department of Chemistry; Dankook University; Cheonan 31116 South Korea
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11
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Jiang B, Xu B, Wang M, Li Z, Liu D, Zhang S. Cobalt(II)/
N
,
N′
,
N′′
‐Trihydroxyisocyanuric Acid Catalyzed Aerobic Oxidative Esterification and Amidation of Aldehydes. ASIAN J ORG CHEM 2018. [DOI: 10.1002/ajoc.201800118] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Affiliation(s)
- Biao‐Lin Jiang
- School of Chemistry and Chemical EngineeringShanxi University Taiyuan 030006 Shanxi China
- Beijing Key Laboratory of Ionic Liquids Clean Process, Key Laboratory of Green Process and EngineeringState Key Laboratory of Multiphase Complex Systems, Institution of Process EngineeringChinese Academy of Sciences Beijing 100190 China
| | - Bao‐Hua Xu
- Beijing Key Laboratory of Ionic Liquids Clean Process, Key Laboratory of Green Process and EngineeringState Key Laboratory of Multiphase Complex Systems, Institution of Process EngineeringChinese Academy of Sciences Beijing 100190 China
| | - Meng‐Liang Wang
- School of Chemistry and Chemical EngineeringShanxi University Taiyuan 030006 Shanxi China
| | - Zeng‐Xi Li
- College of Chemistry and Chemical EngineeringGraduate University of Chinese Academy of Sciences Beijing 100049 China
| | - Dian‐Sheng Liu
- School of Chemistry and Chemical EngineeringShanxi University Taiyuan 030006 Shanxi China
| | - Suo‐Jiang Zhang
- Beijing Key Laboratory of Ionic Liquids Clean Process, Key Laboratory of Green Process and EngineeringState Key Laboratory of Multiphase Complex Systems, Institution of Process EngineeringChinese Academy of Sciences Beijing 100190 China
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12
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Xu X, Sun J, Lin Y, Cheng J, Li P, Jiang X, Bai R, Xie Y. Iron-Nitrate-Catalyzed Oxidative Esterification of Aldehydes and Alcohols with N
-Hydroxyphthalimide: Efficient Synthesis of N
-Hydroxyimide Esters. European J Org Chem 2017. [DOI: 10.1002/ejoc.201701411] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Affiliation(s)
- Xiaohe Xu
- Collaborative Innovation Center of Yangtze River Delta Region Green Pharmaceuticals; Zhejiang University of Technology; Hangzhou P. R. China
| | - Jian Sun
- Collaborative Innovation Center of Yangtze River Delta Region Green Pharmaceuticals; Zhejiang University of Technology; Hangzhou P. R. China
| | - Yuyan Lin
- Collaborative Innovation Center of Yangtze River Delta Region Green Pharmaceuticals; Zhejiang University of Technology; Hangzhou P. R. China
| | - Jingya Cheng
- Collaborative Innovation Center of Yangtze River Delta Region Green Pharmaceuticals; Zhejiang University of Technology; Hangzhou P. R. China
| | - Pingping Li
- Collaborative Innovation Center of Yangtze River Delta Region Green Pharmaceuticals; Zhejiang University of Technology; Hangzhou P. R. China
| | - Xiaoying Jiang
- Collaborative Innovation Center of Yangtze River Delta Region Green Pharmaceuticals; Zhejiang University of Technology; Hangzhou P. R. China
| | - Renren Bai
- Collaborative Innovation Center of Yangtze River Delta Region Green Pharmaceuticals; Zhejiang University of Technology; Hangzhou P. R. China
| | - Yuanyuan Xie
- Collaborative Innovation Center of Yangtze River Delta Region Green Pharmaceuticals; Zhejiang University of Technology; Hangzhou P. R. China
- College of Pharmaceutical Sciences; Zhejiang University of Technology; Hangzhou P. R. China
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13
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Vu MD, Das M, Liu XW. Direct Aldehyde Csp 2 -H Functionalization through Visible-Light-Mediated Photoredox Catalysis. Chemistry 2017; 23:15899-15902. [PMID: 29057525 DOI: 10.1002/chem.201704224] [Citation(s) in RCA: 38] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2017] [Indexed: 12/22/2022]
Abstract
The development of methods for carbon-carbon bond formation under benign conditions is an ongoing challenge for synthetic chemists. In recent years there has been considerable interest in using selective C-H activation as a direct route for generating reactive intermediates. Herein, the use of visible-light-mediated dual photoredox organocatalysis as a mild and effective method for Csp2 -H activation of aldehydes is reported, resulting in the generation of acyl radicals. These nucleophilic acyl radical species can undergo either addition to electrophilic alkenes or nickel-catalyzed cross-coupling reactions to provide a quick access to broad range of unsymmetrical ketones, which are abundantly found in many organic building blocks.
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Affiliation(s)
- Minh Duy Vu
- Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore, 637371, Singapore
| | - Mrinmoy Das
- Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore, 637371, Singapore
| | - Xue-Wei Liu
- Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore, 637371, Singapore
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14
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Łątka P, Kasperczyk K, Orlińska B, Drozdek M, Skorupska B, Witek E. N-Hydroxyphthalimide Immobilized on Poly(HEA-co-DVB) as Catalyst for Aerobic Oxidation Processes. Catal Letters 2016. [DOI: 10.1007/s10562-016-1830-6] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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15
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Majumdar B, Bhattacharya T, Sarma TK. Gold Nanoparticle-Polydopamine-Reduced Graphene Oxide Ternary Nanocomposite as an Efficient Catalyst for Selective Oxidation of Benzylic C(sp3)−H Bonds Under Mild Conditions. ChemCatChem 2016. [DOI: 10.1002/cctc.201600136] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Biju Majumdar
- Discipline of Chemistry, School of Basic Sciences; Indian Institute of Technology Indore, Simrol; Khandwa Road Indore 452020 India
| | - Tamalika Bhattacharya
- Discipline of Chemistry, School of Basic Sciences; Indian Institute of Technology Indore, Simrol; Khandwa Road Indore 452020 India
| | - Tridib K. Sarma
- Discipline of Chemistry, School of Basic Sciences; Indian Institute of Technology Indore, Simrol; Khandwa Road Indore 452020 India
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16
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Lv Y, Sun K, Pu W, Mao S, Li G, Niu J, Chen Q, Wang T. Metal-free intermolecular C–O cross-coupling reactions: synthesis of N-hydroxyimide esters. RSC Adv 2016. [DOI: 10.1039/c6ra22653a] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
Selectfluor-mediated intermolecular C–O cross coupling reaction for the synthesis of N-hydroxyimide esters was achieved under metal-free conditions.
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Affiliation(s)
- Yunhe Lv
- College of Chemistry and Chemical Engineering
- Anyang Normal University
- Anyang
- China
- Jilin Province Key Laboratory of Organic Functional Molecular Design & Synthesis
| | - Kai Sun
- College of Chemistry and Chemical Engineering
- Anyang Normal University
- Anyang
- China
| | - Weiya Pu
- College of Chemistry and Chemical Engineering
- Anyang Normal University
- Anyang
- China
| | - Shukuan Mao
- College of Chemistry and Chemical Engineering
- Anyang Normal University
- Anyang
- China
| | - Gang Li
- College of Chemistry and Chemical Engineering
- Anyang Normal University
- Anyang
- China
| | - Jiejie Niu
- College of Chemistry and Chemical Engineering
- Anyang Normal University
- Anyang
- China
| | - Qian Chen
- College of Chemistry and Chemical Engineering
- Anyang Normal University
- Anyang
- China
| | - Tingting Wang
- College of Chemistry and Chemical Engineering
- Anyang Normal University
- Anyang
- China
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17
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Li J, Wang DZ. Visible-Light-Promoted Photoredox Syntheses of α,β-Epoxy Ketones from Styrenes and Benzaldehydes under Alkaline Conditions. Org Lett 2015; 17:5260-3. [DOI: 10.1021/acs.orglett.5b02629] [Citation(s) in RCA: 60] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Affiliation(s)
- Jing Li
- Laboratory of Chemical Genomics,
School of Chemical Biology and Biotechnology, Shenzhen Graduate School of Peking University, Shenzhen 518055, China
| | - David Zhigang Wang
- Laboratory of Chemical Genomics,
School of Chemical Biology and Biotechnology, Shenzhen Graduate School of Peking University, Shenzhen 518055, China
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18
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Tang RJ, He Q, Yang L. Metal-free oxidative decarbonylative coupling of aromatic aldehydes with arenes: direct access to biaryls. Chem Commun (Camb) 2015; 51:5925-8. [PMID: 25731601 DOI: 10.1039/c4cc10155c] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
A metal-free oxidative decarbonylative coupling of aromatic aldehydes with electron-rich or electron-deficient arenes to produce biaryl compounds was developed. This novel coupling was proposed to proceed via a non-chain radical homolytic aromatic substitution (HAS) type mechanism, based on the substrate scope, ortho-regioselectivity, radical trapping experiments and DFT calculation studies. With the ready availability of aromatic aldehydes and arenes, metal-free conditions should make this coupling attractive for the biaryl synthesis.
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Affiliation(s)
- Ren-Jin Tang
- Key Laboratory for Environmentally Friendly Chemistry and Application of the Ministry of Education, College of Chemistry, Xiangtan University, Hunan, 411105, China.
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19
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Chudasama V. Pentafluorophenyl vinyl sulfonate enables efficient, metal-free, radical-based alkene hydroacylation with an aldehyde as a limiting reagent. RSC Adv 2015. [DOI: 10.1039/c5ra08353b] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Pentafluorophenyl vinyl sulfonate enables efficient radical-based, metal-free, alkene hydroacylation with a single equivalent of an aldehyde.
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20
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Jafarpour M, Rezaeifard A, Yasinzadeh V, Kargar H. Starch-coated maghemite nanoparticles functionalized by a novel cobalt Schiff base complex catalyzes selective aerobic benzylic C–H oxidation. RSC Adv 2015. [DOI: 10.1039/c5ra04718h] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
The CoL2@SMNP nanocatalyst catalyzed heterogeneous aerobic oxidation of benzylic C–H bonds of saturated hydrocarbons and alcohols to the related carbonyl compounds.
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Affiliation(s)
- Maasoumeh Jafarpour
- Catalysis Research Laboratory
- Department of Chemistry
- Faculty of Science
- University of Birjand
- Birjand
| | - Abdolreza Rezaeifard
- Catalysis Research Laboratory
- Department of Chemistry
- Faculty of Science
- University of Birjand
- Birjand
| | - Vahid Yasinzadeh
- Catalysis Research Laboratory
- Department of Chemistry
- Faculty of Science
- University of Birjand
- Birjand
| | - Hossein Kargar
- Catalysis Research Laboratory
- Department of Chemistry
- Faculty of Science
- University of Birjand
- Birjand
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21
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Ouyang XH, Song RJ, Wang CY, Yang Y, Li JH. Metal-free carbonyl C(sp2)–H oxidative alkynylation of aldehydes using hypervalent iodine reagents leading to ynones. Chem Commun (Camb) 2015; 51:14497-500. [DOI: 10.1039/c5cc03362d] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
The metal-free and facile synthesis of ynones via carbonyl C(sp2)–H oxidative alkynylation of aldehydes with enynyl benziodoxolones is presented.
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Affiliation(s)
- Xuan-Hui Ouyang
- State Key Laboratory of Chemo/Biosensing and Chemometrics
- College of Chemistry and Chemical Engineering
- Hunan University
- Changsha 410082
- China
| | - Ren-Jie Song
- State Key Laboratory of Chemo/Biosensing and Chemometrics
- College of Chemistry and Chemical Engineering
- Hunan University
- Changsha 410082
- China
| | - Cheng-Yong Wang
- State Key Laboratory of Chemo/Biosensing and Chemometrics
- College of Chemistry and Chemical Engineering
- Hunan University
- Changsha 410082
- China
| | - Yuan Yang
- State Key Laboratory of Chemo/Biosensing and Chemometrics
- College of Chemistry and Chemical Engineering
- Hunan University
- Changsha 410082
- China
| | - Jin-Heng Li
- State Key Laboratory of Chemo/Biosensing and Chemometrics
- College of Chemistry and Chemical Engineering
- Hunan University
- Changsha 410082
- China
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22
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Mi X, Wang C, Huang M, Wu Y, Wu Y. Preparation of 3-Acyl-4-arylcoumarins via Metal-Free Tandem Oxidative Acylation/Cyclization between Alkynoates with Aldehydes. J Org Chem 2014; 80:148-55. [DOI: 10.1021/jo502220b] [Citation(s) in RCA: 88] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Xia Mi
- College
of Chemistry and Molecular Engineering, Henan Key Laboratory of Chemical
Biology and Organic Chemistry, Key Laboratory of Applied Chemistry
of Henan Universities, Zhengzhou University, Zhengzhou 450052, P. R. China
| | - Chenyang Wang
- College
of Chemistry and Molecular Engineering, Henan Key Laboratory of Chemical
Biology and Organic Chemistry, Key Laboratory of Applied Chemistry
of Henan Universities, Zhengzhou University, Zhengzhou 450052, P. R. China
| | - Mengmeng Huang
- College
of Chemistry and Molecular Engineering, Henan Key Laboratory of Chemical
Biology and Organic Chemistry, Key Laboratory of Applied Chemistry
of Henan Universities, Zhengzhou University, Zhengzhou 450052, P. R. China
| | - Yusheng Wu
- Tetranov Biopharm, LLC, 75 Daxue
Road, Zhengzhou 450052, P.R. China
| | - Yangjie Wu
- College
of Chemistry and Molecular Engineering, Henan Key Laboratory of Chemical
Biology and Organic Chemistry, Key Laboratory of Applied Chemistry
of Henan Universities, Zhengzhou University, Zhengzhou 450052, P. R. China
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23
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Du P, Li H, Wang Y, Cheng J, Wan X. Radical–Polar Crossover Reactions: Oxidative Coupling of 1,3-Dioxolanes with Electron-Deficient Alkenes and Vinylarenes Based on a Radical Addition and Kornblum–DeLaMare Rearrangement. Org Lett 2014; 16:6350-3. [DOI: 10.1021/ol503128j] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Peng Du
- Key
Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry,
Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, China
| | - Huihuang Li
- Key
Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry,
Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, China
| | - Yaxiong Wang
- Key
Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry,
Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, China
| | - Jiang Cheng
- Key
Laboratory of Advanced Catalytic Materials and Technology, Changzhou University, Changzhou 213164, China
| | - Xiaobing Wan
- Key
Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry,
Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, China
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24
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Wei WT, Yang XH, Li HB, Li JH. Oxidative Coupling of Alkenes with Aldehydes and Hydroperoxides: One-Pot Synthesis of 2,3-Epoxy Ketones. Adv Synth Catal 2014. [DOI: 10.1002/adsc.201400629] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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25
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Niu B, Xu L, Xie P, Wang M, Zhao W, Pittman CU, Zhou A. Diversity-oriented syntheses: coupling reactions between electron-deficient olefins and aryl aldehydes via C(sp2)-H functionalization. ACS COMBINATORIAL SCIENCE 2014; 16:454-8. [PMID: 25062387 DOI: 10.1021/co500086f] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
A diversity-oriented syntheses by coupling three electron-deficient olefins (vinyl sulfonamides, methacrylamides, and methyl acrylates, respectively) with aryl aldehydes via C(sp(2))-H functionalization were reported. These reactions gave four different skeletal products respectively under environment-friendly and mild conditions. All these reactions are highly regioselective and effective, very suitable for the preparation of synthetic building blocks and compound library, the results will enrich current coupling chemistry of olefins with aldehydes and can be applied to other chemistry areas as well.
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Affiliation(s)
- Ben Niu
- Pharmacy
School, Jiangsu University, Xuefu Road 301, Zhenjiang, Jiangsu, China, 212013
| | - Lei Xu
- Pharmacy
School, Jiangsu University, Xuefu Road 301, Zhenjiang, Jiangsu, China, 212013
| | - Ping Xie
- Scientific
Information Research Institute, Jiangsu University, Xuefu Road
301, Zhenjiang, Jiangsu, China, 212013
| | - Min Wang
- Pharmacy
School, Jiangsu University, Xuefu Road 301, Zhenjiang, Jiangsu, China, 212013
| | - Wannian Zhao
- Pharmacy
School, Jiangsu University, Xuefu Road 301, Zhenjiang, Jiangsu, China, 212013
| | - Charles U. Pittman
- Department
of Chemistry, Mississippi State University, Mississippi State, Mississippi 39762, United States
| | - Aihua Zhou
- Pharmacy
School, Jiangsu University, Xuefu Road 301, Zhenjiang, Jiangsu, China, 212013
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26
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Ouyang XH, Song RJ, Li Y, Liu B, Li JH. Metal-free oxidative ipso-carboacylation of alkynes: synthesis of 3-acylspiro[4,5]trienones from N-arylpropiolamides and aldehydes. J Org Chem 2014; 79:4582-9. [PMID: 24766351 DOI: 10.1021/jo5005982] [Citation(s) in RCA: 95] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A general and metal-free radical route to synthesis of 3-acylspiro[4,5]trienones is established that utilizes TBHP (tert-butyl hydrogenperoxide) as an oxidation and a reaction partner to trigger the oxidative ipso-carboacylation of N-arylpropiolamides with aldehydes. This method offers a new difunctionalization of alkynes through oxidative cross coupling of the aldehyde C(sp(2))-H bond with an ipso-aromatic carbon.
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Affiliation(s)
- Xuan-Hui Ouyang
- State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University , Changsha 410082, China
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27
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Schweitzer-Chaput B, Demaerel J, Engler H, Klussmann M. Säurekatalysierte oxidative Radikaladdition von Ketonen an Olefine. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201401062] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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28
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Schweitzer-Chaput B, Demaerel J, Engler H, Klussmann M. Acid-Catalyzed Oxidative Radical Addition of Ketones to Olefins. Angew Chem Int Ed Engl 2014; 53:8737-40. [DOI: 10.1002/anie.201401062] [Citation(s) in RCA: 131] [Impact Index Per Article: 13.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2014] [Indexed: 11/10/2022]
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29
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Yang XH, Wei WT, Li HB, Song RJ, Li JH. Oxidative coupling of alkenes with amides using peroxides: selective amide C(sp3)–H versus C(sp2)–H functionalization. Chem Commun (Camb) 2014; 50:12867-9. [DOI: 10.1039/c4cc05051g] [Citation(s) in RCA: 58] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A new oxidative coupling of alkenes with amides to achieve mono- and difunctionalization of alkenes is described.
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Affiliation(s)
- Xu-Heng Yang
- State Key Laboratory of Chemo/Biosensing and Chemometrics
- College of Chemistry and Chemical Engineering
- Hunan University
- Changsha 410082, China
| | - Wen-Ting Wei
- State Key Laboratory of Chemo/Biosensing and Chemometrics
- College of Chemistry and Chemical Engineering
- Hunan University
- Changsha 410082, China
| | - Hai-Bing Li
- State Key Laboratory of Chemo/Biosensing and Chemometrics
- College of Chemistry and Chemical Engineering
- Hunan University
- Changsha 410082, China
| | - Ren-Jie Song
- State Key Laboratory of Chemo/Biosensing and Chemometrics
- College of Chemistry and Chemical Engineering
- Hunan University
- Changsha 410082, China
| | - Jin-Heng Li
- State Key Laboratory of Chemo/Biosensing and Chemometrics
- College of Chemistry and Chemical Engineering
- Hunan University
- Changsha 410082, China
- State Key Laboratory of Applied Organic Chemistry Lanzhou University
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30
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Chudasama V, Akhbar AR, Bahou KA, Fitzmaurice RJ, Caddick S. Metal-free, hydroacylation of C=C and N=N bonds via aerobic C-H activation of aldehydes, and reaction of the products thereof. Org Biomol Chem 2013; 11:7301-17. [PMID: 24068290 DOI: 10.1039/c3ob41632a] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In this report, a thorough evaluation of the use of aerobically initiated, metal-free hydroacylation of various C=C and N=N acceptor molecules with a wide range of aldehydes is presented. The aerobic-activation conditions that have been developed are in sharp contrast to previous conditions for hydroacylation, which tend to use transition metals, peroxides that require thermal or photochemical degradation, or N-heterocyclic carbenes. The mildness of the conditions enables a number of reactions involving sensitive reaction partners and, perhaps most significantly, allows for α-functionalised chiral aldehydes to undergo radical-based hydroacylation with complete retention of optical purity. We also demonstrate how the resulting hydroacylation products can be transformed into other useful intermediates, such as γ-keto-sulfonamides, sultams, sultones, cyclic N-sulfonyl imines and amides.
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Affiliation(s)
- Vijay Chudasama
- Department of Chemistry, University College London, 20 Gordon Street, London, WC1H OAJ, UK.
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31
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Melone L, Punta C. Metal-free aerobic oxidations mediated by N-hydroxyphthalimide. A concise review. Beilstein J Org Chem 2013; 9:1296-310. [PMID: 23843925 PMCID: PMC3701383 DOI: 10.3762/bjoc.9.146] [Citation(s) in RCA: 117] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2013] [Accepted: 06/12/2013] [Indexed: 01/20/2023] Open
Abstract
Since the beginning of the century, N-hydroxyphthalimide and related compounds have been revealed to be efficient organocatalysts for free-radical processes and have found ample application in promoting the aerobic oxidation of a wide range of organic substrates. When combined with different co-catalysts, they are activated to the corresponding N-oxyl radical species and become able to promote radical chains, involving molecular oxygen, directly or indirectly. Most of the examples reported in the literature describe the use of these N-hydroxy derivatives in the presence of transition-metal complexes. However, eco-friendly standards, including the demand for highly selective transformations, impose the development of metal-free processes, especially for large-scale productions, as in the case of the oxygenation of hydrocarbons. For this reason, many efforts have been devoted in the past decade to the design of new protocols for the activation of N-hydroxy imides in the presence of nonmetal initiators. Herein we provide a concise overview of the most significant and successful examples in this field, with the final aim to furnish a useful instrument for all scientists actively involved in the O2-mediated selective oxidation of organic compounds and looking for environmentally safe alternatives to metal catalysis.
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Affiliation(s)
- Lucio Melone
- Department of Chemistry, Materials, and Chemical Engineering "Giulio Natta", Politecnico di Milano, Piazza L. Da Vinci 32, Milano 20131, Italy ; INSTM, National Consortium of Materials Science and Technology, Local Unit Politecnico di Milano, Italy
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32
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Wang J, Liu C, Yuan J, Lei A. Copper-Catalyzed Oxidative Coupling of Alkenes with Aldehydes: Direct Access to α,β-Unsaturated Ketones. Angew Chem Int Ed Engl 2013. [DOI: 10.1002/ange.201208920] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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33
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Wang J, Liu C, Yuan J, Lei A. Copper-Catalyzed Oxidative Coupling of Alkenes with Aldehydes: Direct Access to α,β-Unsaturated Ketones. Angew Chem Int Ed Engl 2013; 52:2256-9. [DOI: 10.1002/anie.201208920] [Citation(s) in RCA: 185] [Impact Index Per Article: 16.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2012] [Indexed: 11/06/2022]
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34
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Zhou MB, Song RJ, Ouyang XH, Liu Y, Wei WT, Deng GB, Li JH. Metal-free oxidative tandem coupling of activated alkenes with carbonyl C(sp2)–H bonds and aryl C(sp2)–H bonds using TBHP. Chem Sci 2013. [DOI: 10.1039/c3sc50810b] [Citation(s) in RCA: 227] [Impact Index Per Article: 20.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
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35
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Alvarez LX, Kudrik EV, Sorokin AB. Novel Reactivity of N-Bridged Diiron Phthalocyanine in the Activation of CH Bonds: Hydroacylation of Olefins as an Example of the Efficient Formation of CC Bonds. Chemistry 2011; 17:9298-301. [DOI: 10.1002/chem.201100650] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2011] [Revised: 05/25/2011] [Indexed: 11/10/2022]
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36
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Aitken HM, Schiesser CH, Donner CD. Synthetic and Computational Studies of Acyl Radical Cyclizations with β-Alkoxyacrylates: Formal Synthesis of (±)-Longianone. Aust J Chem 2011. [DOI: 10.1071/ch10462] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
An investigation into the cyclization of acyl radicals with mono- and disubstituted β-alkoxyacrylates is described. Ether-tethered acyl radicals, generated directly from the corresponding aldehyde, undergo cyclization to form dioxaspiro heterocyclic systems including 1,7-dioxaspiro[4,4]nonane-4,8-dione and 1,8-dioxaspiro[5,4]decane-5,9-dione. This strategy is applied to a concise formal synthesis of the fungal metabolite longianone. Density functional theory calculations provide insight into the chemistry of the acyl radicals in this study.
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37
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Ravelli D, Albini A, Fagnoni M. Smooth Photocatalytic Preparation of 2‐Substituted 1,3‐Benzodioxoles. Chemistry 2010; 17:572-9. [DOI: 10.1002/chem.201002546] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2010] [Indexed: 11/12/2022]
Affiliation(s)
- Davide Ravelli
- Department of Organic Chemistry, University of Pavia, Via Taramelli 10 (Italy), Fax: (+39) 0382‐987316
| | - Angelo Albini
- Department of Organic Chemistry, University of Pavia, Via Taramelli 10 (Italy), Fax: (+39) 0382‐987316
| | - Maurizio Fagnoni
- Department of Organic Chemistry, University of Pavia, Via Taramelli 10 (Italy), Fax: (+39) 0382‐987316
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38
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Chudasama V, Fitzmaurice RJ, Caddick S. Hydroacylation of α,β-unsaturated esters via aerobic C–H activation. Nat Chem 2010; 2:592-6. [DOI: 10.1038/nchem.685] [Citation(s) in RCA: 172] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2010] [Accepted: 04/21/2010] [Indexed: 12/17/2022]
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39
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Chudasama V, Fitzmaurice RJ, Ahern JM, Caddick S. Dioxygen mediated hydroacylation of vinyl sulfonates and sulfones on water. Chem Commun (Camb) 2010; 46:133-5. [DOI: 10.1039/b914563j] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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40
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Zheng G, Liu C, Wang Q, Wang M, Yang G. Metal-Free: An Efficient and Selective Catalytic Aerobic Oxidation of Hydrocarbons with Oxime andN-Hydroxyphthalimide. Adv Synth Catal 2009. [DOI: 10.1002/adsc.200900509] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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41
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42
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Coseri S. Phthalimide‐N‐oxyl (PINO) Radical, a Powerful Catalytic Agent: Its Generation and Versatility Towards Various Organic Substrates. CATALYSIS REVIEWS-SCIENCE AND ENGINEERING 2009. [DOI: 10.1080/01614940902743841] [Citation(s) in RCA: 144] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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43
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Fitzmaurice RJ, Ahern JM, Caddick S. Synthesis of unsymmetrical ketonesvia simple C–H activation of aldehydes and concomitant hydroacylation of vinyl sulfonates. Org Biomol Chem 2009; 7:235-7. [DOI: 10.1039/b819235a] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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44
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Shaabani A, Rahmati A. Aerobic oxidation of alkyl arenes using a combination of N-hydroxy phthalimide and recyclable cobalt(II) tetrasulfophthalocyanine supported on silica. CATAL COMMUN 2008. [DOI: 10.1016/j.catcom.2007.12.023] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
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45
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Recupero F, Punta C. Free Radical Functionalization of Organic Compounds Catalyzed byN-Hydroxyphthalimide. Chem Rev 2007; 107:3800-42. [PMID: 17848093 DOI: 10.1021/cr040170k] [Citation(s) in RCA: 478] [Impact Index Per Article: 28.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Francesco Recupero
- Dipartimento di Chimica, Materiali e Ingegneria Chimica "Giulio Natta", Politecnico di Milano, Via Mancinelli 7, I-20131 Milano MI, Italy
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46
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Xu Y, Zhang SL, Duan WH. A new radical way to N,N-dimethylaniline hydroperoxide (DMAHP) and its application in organic synthesis. CHINESE CHEM LETT 2007. [DOI: 10.1016/j.cclet.2007.05.036] [Citation(s) in RCA: 3] [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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47
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48
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49
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Yamamoto Y, Maekawa M, Akindele T, Yamada KI, Tomioka K. Dimethylzinc-initiated radical reaction of cyclic ethers with arylamines, alkoxyamines, and dialkylhydrazines. Tetrahedron 2005. [DOI: 10.1016/j.tet.2004.10.080] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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50
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Yoshikai K, Hayama T, Nishimura K, Yamada KI, Tomioka K. Mechanistic Aspects of Thiyl Radical-Promoted Acyl Radical Cyclization of Formylenoate-Cyclization versus Oxidation. Chem Pharm Bull (Tokyo) 2005; 53:586-8. [PMID: 15863938 DOI: 10.1248/cpb.53.586] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Treatment of formylalkenoates 1 and 7 with 2,2'-azobis(2-methylpropanenitrile) (AIBN) in the presence of dioxygen gave oxygenated carboxylic acids 5, 6, 8, 9 instead of acyl radical cyclization products, through preferential reaction of the corresponding acyl radicals with dioxygen rather than intramolecular attack to an enoate moiety. The reaction of 1 with AIBN in the absence of dioxygen recovered starting 1 in 98% yield.
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Affiliation(s)
- Kazuya Yoshikai
- Graduate School of Pharmaceutical Sciences, Kyoto University, Yoshida, Kyoto 606-8501, Japan
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