1551
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Miyazawa K, Koike T, Akita M. Hydroaminomethylation of Olefins with Aminomethyltrifluoroborate by Photoredox Catalysis. Adv Synth Catal 2014. [DOI: 10.1002/adsc.201400556] [Citation(s) in RCA: 94] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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1552
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Ushakov DB, Gilmore K, Seeberger PH. Consecutive oxygen-based oxidations convert amines to α-cyanoepoxides. Chem Commun (Camb) 2014; 50:12649-51. [DOI: 10.1039/c4cc04932b] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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1553
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Yu C, Iqbal N, Park S, Cho EJ. Selective difluoroalkylation of alkenes by using visible light photoredox catalysis. Chem Commun (Camb) 2014; 50:12884-7. [DOI: 10.1039/c4cc05467a] [Citation(s) in RCA: 202] [Impact Index Per Article: 20.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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1554
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Blum TR, Zhu Y, Nordeen SA, Yoon TP. Photocatalytic Synthesis of Dihydrobenzofurans by Oxidative [3+2] Cycloaddition of Phenols. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201406393] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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1555
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Dagousset G, Carboni A, Magnier E, Masson G. Photoredox-Induced Three-Component Azido- and Aminotrifluoromethylation of Alkenes. Org Lett 2014; 16:4340-3. [DOI: 10.1021/ol5021477] [Citation(s) in RCA: 159] [Impact Index Per Article: 15.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Affiliation(s)
- Guillaume Dagousset
- Centre de Recherche
de Gif, Institut de Chimie des Substances Naturelles, CNRS, 91198 Gif-sur-Yvette Cedex, France
| | - Aude Carboni
- Centre de Recherche
de Gif, Institut de Chimie des Substances Naturelles, CNRS, 91198 Gif-sur-Yvette Cedex, France
| | - Emmanuel Magnier
- Institut
Lavoisier de Versailles, UMR 8180, Université de Versailles-Saint-Quentin, 78035 Versailles Cedex, France
| | - Géraldine Masson
- Centre de Recherche
de Gif, Institut de Chimie des Substances Naturelles, CNRS, 91198 Gif-sur-Yvette Cedex, France
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1556
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1557
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Ding W, Zhou QQ, Xuan J, Li TR, Lu LQ, Xiao WJ. Photocatalytic aerobic oxidation/semipinacol rearrangement sequence: a concise route to the core of pseudoindoxyl alkaloids. Tetrahedron Lett 2014. [DOI: 10.1016/j.tetlet.2014.06.102] [Citation(s) in RCA: 80] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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1558
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Sun H, Yang C, Lin R, Xia W. Regioselective Ring-Opening Nucleophilic Addition of Aziridines through Photoredox Catalyst. Adv Synth Catal 2014. [DOI: 10.1002/adsc.201400476] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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1559
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1560
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Kafka F, Holan M, Hidasová D, Pohl R, Císařová I, Klepetářová B, Jahn U. Oxidative Katalyse mit dem stöchiometrischen Oxidans als Reagens: eine effiziente Strategie für Einelektronentransfer-induzierte Anion-Radikal-Tandemreaktionen. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201403776] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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1561
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Kafka F, Holan M, Hidasová D, Pohl R, Císařová I, Klepetářová B, Jahn U. Oxidative Catalysis Using the Stoichiometric Oxidant as a Reagent: An Efficient Strategy for Single-Electron-Transfer-Induced Tandem Anion-Radical Reactions. Angew Chem Int Ed Engl 2014; 53:9944-8. [DOI: 10.1002/anie.201403776] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2014] [Revised: 06/11/2014] [Indexed: 01/25/2023]
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1562
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Su Y, Straathof NJW, Hessel V, Noël T. Photochemical transformations accelerated in continuous-flow reactors: basic concepts and applications. Chemistry 2014; 20:10562-89. [PMID: 25056280 DOI: 10.1002/chem.201400283] [Citation(s) in RCA: 364] [Impact Index Per Article: 36.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2014] [Indexed: 11/10/2022]
Abstract
Continuous-flow photochemistry is used increasingly by researchers in academia and industry to facilitate photochemical processes and their subsequent scale-up. However, without detailed knowledge concerning the engineering aspects of photochemistry, it can be quite challenging to develop a suitable photochemical microreactor for a given reaction. In this review, we provide an up-to-date overview of both technological and chemical aspects associated with photochemical processes in microreactors. Important design considerations, such as light sources, material selection, and solvent constraints are discussed. In addition, a detailed description of photon and mass-transfer phenomena in microreactors is made and fundamental principles are deduced for making a judicious choice for a suitable photomicroreactor. The advantages of microreactor technology for photochemistry are described for UV and visible-light driven photochemical processes and are compared with their batch counterparts. In addition, different scale-up strategies and limitations of continuous-flow microreactors are discussed.
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Affiliation(s)
- Yuanhai Su
- Department of Chemical Engineering and Chemistry, Micro Flow Chemistry and Process Technology, Eindhoven University of Technology, Den Dolech 2 (STW 1.48), 5600 MB Eindhoven (The Netherlands) http://www.tue.nl/staff/T.Noel
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1563
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Beatty JW, Stephenson CRJ. Synthesis of (-)-pseudotabersonine, (-)-pseudovincadifformine, and (+)-coronaridine enabled by photoredox catalysis in flow. J Am Chem Soc 2014; 136:10270-3. [PMID: 25003992 PMCID: PMC4233208 DOI: 10.1021/ja506170g] [Citation(s) in RCA: 127] [Impact Index Per Article: 12.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2014] [Indexed: 12/20/2022]
Abstract
Natural product modification with photoredox catalysis allows for mild, chemoselective access to a wide array of related structures in complex areas of chemical space, providing the possibility for novel structural motifs as well as useful quantities of less abundant congeners. While amine additives have been used extensively as stoichiometric electron donors for photocatalysis, the controlled modification of amine substrates through single-electron oxidation is ideal for the synthesis and modification of alkaloids. Here, we report the conversion of the amine (+)-catharanthine into the natural products (-)-pseudotabersonine, (-)-pseudovincadifformine, and (+)-coronaridine utilizing visible light photoredox catalysis.
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Affiliation(s)
- Joel W. Beatty
- Department of Chemistry, University
of Michigan, Ann Arbor, Michigan 48109, United
States
| | - Corey R. J. Stephenson
- Department of Chemistry, University
of Michigan, Ann Arbor, Michigan 48109, United
States
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1564
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Dai X, Cheng D, Guan B, Mao W, Xu X, Li X. The Coupling of Tertiary Amines with Acrylate Derivatives via Visible-Light Photoredox Catalysis. J Org Chem 2014; 79:7212-9. [DOI: 10.1021/jo501097b] [Citation(s) in RCA: 69] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Affiliation(s)
- Xiaojun Dai
- Institute
of Industrial Catalysis, College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, People’s Republic of China
| | - Dongping Cheng
- College
of Pharmaceutical Science, Zhejiang University of Technology, Hangzhou 310014, People’s Republic of China
| | - Baochuan Guan
- Institute
of Industrial Catalysis, College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, People’s Republic of China
| | - Wenjuan Mao
- Institute
of Industrial Catalysis, College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, People’s Republic of China
| | - Xiaoliang Xu
- Institute
of Industrial Catalysis, College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, People’s Republic of China
| | - Xiaonian Li
- Institute
of Industrial Catalysis, College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, People’s Republic of China
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1565
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Griesbeck AG. Organic synthesis using photoredox catalysis. Beilstein J Org Chem 2014; 10:1097-8. [PMID: 24991258 PMCID: PMC4077364 DOI: 10.3762/bjoc.10.107] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2014] [Accepted: 04/30/2014] [Indexed: 12/02/2022] Open
Affiliation(s)
- Axel G Griesbeck
- University of Cologne, Department of Chemistry, Organic Chemistry, Greinstr. 4, D-50939 Köln, Germany
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1566
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Deng QH, Zou YQ, Lu LQ, Tang ZL, Chen JR, Xiao WJ. De Novo Synthesis of Imidazoles by Visible-Light-Induced Photocatalytic Aerobic Oxidation/[3+2] Cycloaddition/Aromatization Cascade. Chem Asian J 2014; 9:2432-5. [DOI: 10.1002/asia.201402443] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2014] [Indexed: 11/06/2022]
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1567
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Lu Z, Parrish JD, Yoon TP. [3+2] Photooxygenation of aryl cylopropanes via visible light photocatalysis. Tetrahedron 2014; 70:4270-4278. [PMID: 25170179 DOI: 10.1016/j.tet.2014.02.045] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
We report that Ru(bpz)32+ is an excellent sensitizer for the photooxygenation of aryl cyclopropanes upon irradiation with visible light. The effectiveness of this photocatalyst enables the synthesis of a range of five-membered endoperoxides in excellent yield with quite low (0.5 mol%) catalyst loadings even when standard household light sources are utilized.
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Affiliation(s)
- Zhan Lu
- Department of Chemistry, University of Wisconsin-Madison, 1101 University Avenue, Madison WI 53706, USA
| | - Jonathan D Parrish
- Department of Chemistry, University of Wisconsin-Madison, 1101 University Avenue, Madison WI 53706, USA
| | - Tehshik P Yoon
- Department of Chemistry, University of Wisconsin-Madison, 1101 University Avenue, Madison WI 53706, USA
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1568
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He M, Soulé JF, Doucet H. Synthesis of (Poly)fluorobiphenyls through Metal-catalyzed CH Bond Activation/Arylation of (Poly)fluorobenzene Derivatives. ChemCatChem 2014. [DOI: 10.1002/cctc.201402020] [Citation(s) in RCA: 77] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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1569
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Qin Q, Yu S. Visible-Light-Promoted Redox Neutral C–H Amidation of Heteroarenes with Hydroxylamine Derivatives. Org Lett 2014; 16:3504-7. [DOI: 10.1021/ol501457s] [Citation(s) in RCA: 132] [Impact Index Per Article: 13.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Affiliation(s)
- Qixue Qin
- State Key
Laboratory of Analytical
Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, China
| | - Shouyun Yu
- State Key
Laboratory of Analytical
Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, China
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1570
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Xu J, Jung K, Boyer C. Oxygen Tolerance Study of Photoinduced Electron Transfer–Reversible Addition–Fragmentation Chain Transfer (PET-RAFT) Polymerization Mediated by Ru(bpy)3Cl2. Macromolecules 2014. [DOI: 10.1021/ma500883y] [Citation(s) in RCA: 237] [Impact Index Per Article: 23.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- Jiangtao Xu
- Centre for Advanced Macromolecular
Design (CAMD) and Australian Centre for NanoMedicine (ACN), School
of Chemical Engineering, UNSW Australia, Sydney, NSW 2052, Australia
| | - Kenward Jung
- Centre for Advanced Macromolecular
Design (CAMD) and Australian Centre for NanoMedicine (ACN), School
of Chemical Engineering, UNSW Australia, Sydney, NSW 2052, Australia
| | - Cyrille Boyer
- Centre for Advanced Macromolecular
Design (CAMD) and Australian Centre for NanoMedicine (ACN), School
of Chemical Engineering, UNSW Australia, Sydney, NSW 2052, Australia
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1571
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Zhang P, Xiao T, Xiong S, Dong X, Zhou L. Synthesis of 3-Acylindoles by Visible-Light Induced Intramolecular Oxidative Cyclization of o-Alkynylated N,N-Dialkylamines. Org Lett 2014; 16:3264-7. [PMID: 24895026 DOI: 10.1021/ol501276j] [Citation(s) in RCA: 80] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
- Ping Zhang
- School of Chemistry
and Chemical
Engineering, Sun Yat-Sen University, 135 Xingang West Road, Guangzhou 510275, China
| | - Tiebo Xiao
- School of Chemistry
and Chemical
Engineering, Sun Yat-Sen University, 135 Xingang West Road, Guangzhou 510275, China
| | - Shengwei Xiong
- School of Chemistry
and Chemical
Engineering, Sun Yat-Sen University, 135 Xingang West Road, Guangzhou 510275, China
| | - Xichang Dong
- School of Chemistry
and Chemical
Engineering, Sun Yat-Sen University, 135 Xingang West Road, Guangzhou 510275, China
| | - Lei Zhou
- School of Chemistry
and Chemical
Engineering, Sun Yat-Sen University, 135 Xingang West Road, Guangzhou 510275, China
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1572
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Gesmundo NJ, Nicewicz DA. Cyclization-endoperoxidation cascade reactions of dienes mediated by a pyrylium photoredox catalyst. Beilstein J Org Chem 2014; 10:1272-81. [PMID: 24991279 PMCID: PMC4077508 DOI: 10.3762/bjoc.10.128] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2014] [Accepted: 05/06/2014] [Indexed: 11/23/2022] Open
Abstract
Triarylpyrylium salts were employed as single electron photooxidants to catalyze a cyclization-endoperoxidation cascade of dienes. The transformation is presumed to proceed via the intermediacy of diene cation radicals. The nature of the diene component was investigated in this context to determine the structural requirements necessary for successful reactivity. Several unique endoperoxide structures were synthesized in yields up to 79%.
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Affiliation(s)
- Nathan J Gesmundo
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599-3290, USA
| | - David A Nicewicz
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599-3290, USA
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1573
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Pandey G, Jadhav D, Tiwari SK, Singh B. Visible Light Photoredox Catalysis: Investigation of Distalsp3CH Functionalization of Tertiary Amines for Alkylation Reaction. Adv Synth Catal 2014. [DOI: 10.1002/adsc.201400107] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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1574
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Vila C, Lau J, Rueping M. Visible-light photoredox catalyzed synthesis of pyrroloisoquinolines via organocatalytic oxidation/[3 + 2] cycloaddition/oxidative aromatization reaction cascade with Rose Bengal. Beilstein J Org Chem 2014; 10:1233-8. [PMID: 24991273 PMCID: PMC4077507 DOI: 10.3762/bjoc.10.122] [Citation(s) in RCA: 65] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2014] [Accepted: 04/30/2014] [Indexed: 11/23/2022] Open
Abstract
Pyrrolo[2,1-a]isoquinoline alkaloids have been prepared via a visible light photoredox catalyzed oxidation/[3 + 2] cycloaddition/oxidative aromatization cascade using Rose Bengal as an organo-photocatalyst. A variety of pyrroloisoquinolines have been obtained in good yields under mild and metal-free reaction conditions.
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Affiliation(s)
- Carlos Vila
- Institute of Organic Chemistry, RWTH Aachen University, Landoltweg 1, D-52074 Aachen, Germany
| | - Jonathan Lau
- Institute of Organic Chemistry, RWTH Aachen University, Landoltweg 1, D-52074 Aachen, Germany
| | - Magnus Rueping
- Institute of Organic Chemistry, RWTH Aachen University, Landoltweg 1, D-52074 Aachen, Germany
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1575
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Tomita R, Yasu Y, Koike T, Akita M. Combining Photoredox‐Catalyzed Trifluoromethylation and Oxidation with DMSO: Facile Synthesis of α‐Trifluoromethylated Ketones from Aromatic Alkenes. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201403590] [Citation(s) in RCA: 66] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Ren Tomita
- Chemical Resources Laboratory, Tokyo Institute of Technology, R1‐27, 4259 Nagatsuta, Midori‐ku, Yokohama 226‐8503 (Japan) http://www.res.titech.ac.jp/∼smart/smart_e.html
| | - Yusuke Yasu
- Chemical Resources Laboratory, Tokyo Institute of Technology, R1‐27, 4259 Nagatsuta, Midori‐ku, Yokohama 226‐8503 (Japan) http://www.res.titech.ac.jp/∼smart/smart_e.html
| | - Takashi Koike
- Chemical Resources Laboratory, Tokyo Institute of Technology, R1‐27, 4259 Nagatsuta, Midori‐ku, Yokohama 226‐8503 (Japan) http://www.res.titech.ac.jp/∼smart/smart_e.html
| | - Munetaka Akita
- Chemical Resources Laboratory, Tokyo Institute of Technology, R1‐27, 4259 Nagatsuta, Midori‐ku, Yokohama 226‐8503 (Japan) http://www.res.titech.ac.jp/∼smart/smart_e.html
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1576
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Tomita R, Yasu Y, Koike T, Akita M. Combining photoredox-catalyzed trifluoromethylation and oxidation with DMSO: facile synthesis of α-trifluoromethylated ketones from aromatic alkenes. Angew Chem Int Ed Engl 2014; 53:7144-8. [PMID: 24863669 DOI: 10.1002/anie.201403590] [Citation(s) in RCA: 246] [Impact Index Per Article: 24.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2014] [Indexed: 11/11/2022]
Abstract
Trifluoromethylated ketones are useful building blocks for organic compounds with a trifluoromethyl group. A new and facile synthesis of ketones with a trifluoromethyl substituent in the α-position proceeds through a one-pot photoredox-catalyzed trifluoromethylation-oxidation sequence of aromatic alkenes. Dimethyl sulfoxide (DMSO) serves as a key and mild oxidant under these photocatalytic conditions. Furthermore, an iridium photocatalyst, fac[Ir(ppy)3 ] (ppy=2-phenylpyridine), turned out to be crucial for the present photoredox process.
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Affiliation(s)
- Ren Tomita
- Chemical Resources Laboratory, Tokyo Institute of Technology, R1-27, 4259 Nagatsuta, Midori-ku, Yokohama 226-8503 (Japan) http://www.res.titech.ac.jp/∼smart/smart_e.html
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1577
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1578
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Aguirre-Soto A, Lim CH, Hwang AT, Musgrave CB, Stansbury JW. Visible-light organic photocatalysis for latent radical-initiated polymerization via 2e⁻/1H⁺ transfers: initiation with parallels to photosynthesis. J Am Chem Soc 2014; 136:7418-27. [PMID: 24786755 PMCID: PMC4046762 DOI: 10.1021/ja502441d] [Citation(s) in RCA: 69] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2014] [Indexed: 01/18/2023]
Abstract
We report the latent production of free radicals from energy stored in a redox potential through a 2e(-)/1H(+) transfer process, analogous to energy harvesting in photosynthesis, using visible-light organic photoredox catalysis (photocatalysis) of methylene blue chromophore with a sacrificial sterically hindered amine reductant and an onium salt oxidant. This enables light-initiated free-radical polymerization to continue over extended time intervals (hours) in the dark after brief (seconds) low-intensity illumination and beyond the spatial reach of light by diffusion of the metastable leuco-methylene blue photoproduct. The present organic photoredox catalysis system functions via a 2e(-)/1H(+) shuttle mechanism, as opposed to the 1e(-) transfer process typical of organometallic-based and conventional organic multicomponent photoinitiator formulations. This prevents immediate formation of open-shell (radical) intermediates from the amine upon light absorption and enables the "storage" of light-energy without spontaneous initiation of the polymerization. Latent energy release and radical production are then controlled by the subsequent light-independent reaction (analogous to the Calvin cycle) between leuco-methylene blue and the onium salt oxidant that is responsible for regeneration of the organic methylene blue photocatalyst. This robust approach for photocatalysis-based energy harvesting and extended release in the dark enables temporally controlled redox initiation of polymer syntheses under low-intensity short exposure conditions and permits visible-light-mediated synthesis of polymers at least 1 order of magnitude thicker than achievable with conventional photoinitiated formulations and irradiation regimes.
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Affiliation(s)
- Alan Aguirre-Soto
- Department
of Chemical and Biological Engineering, University of Colorado Boulder, 3415 Colorado Ave., Boulder, Colorado 80303, United
States
| | - Chern-Hooi Lim
- Department
of Chemical and Biological Engineering, University of Colorado Boulder, 3415 Colorado Ave., Boulder, Colorado 80303, United
States
| | - Albert T. Hwang
- Department
of Chemical and Biological Engineering, University of Colorado Boulder, 3415 Colorado Ave., Boulder, Colorado 80303, United
States
| | - Charles B. Musgrave
- Department
of Chemical and Biological Engineering, University of Colorado Boulder, 3415 Colorado Ave., Boulder, Colorado 80303, United
States
| | - Jeffrey W. Stansbury
- Department
of Chemical and Biological Engineering, University of Colorado Boulder, 3415 Colorado Ave., Boulder, Colorado 80303, United
States
- Department
of Craniofacial Biology, School of Dental Medicine, University of Colorado, 12800 East 19th Ave., Aurora, Colorado 80045, United
States
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1579
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Griesbeck AG, Reckenthäler M. Homogeneous and heterogeneous photoredox-catalyzed hydroxymethylation of ketones and keto esters: catalyst screening, chemoselectivity and dilution effects. Beilstein J Org Chem 2014; 10:1143-50. [PMID: 24991265 PMCID: PMC4077468 DOI: 10.3762/bjoc.10.114] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2014] [Accepted: 04/22/2014] [Indexed: 11/23/2022] Open
Abstract
The homogeneous titanium- and dye-catalyzed as well as the heterogeneous semiconductor particle-catalyzed photohydroxymethylation of ketones by methanol were investigated in order to evaluate the most active photocatalyst system. Dialkoxytitanium dichlorides are the most efficient species for chemoselective hydroxymethylation of acetophenone as well as other aromatic and aliphatic ketones. Pinacol coupling is the dominant process for semiconductor catalysis and ketone reduction dominates the Ti(OiPr)4/methanol or isopropanol systems. Application of dilution effects on the TiO2 catalysis leads to an increase in hydroxymethylation at the expense of the pinacol coupling.
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Affiliation(s)
- Axel G Griesbeck
- University of Cologne, Department of Chemistry, Organic Chemistry, Greinstr. 4, D-50939 Köln, Germany; Fax: +49(221)470 5057
| | - Melissa Reckenthäler
- University of Cologne, Department of Chemistry, Organic Chemistry, Greinstr. 4, D-50939 Köln, Germany; Fax: +49(221)470 5057
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1580
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Tomita R, Yasu Y, Koike T, Akita M. Direct C-H trifluoromethylation of di- and trisubstituted alkenes by photoredox catalysis. Beilstein J Org Chem 2014; 10:1099-106. [PMID: 24991259 PMCID: PMC4077392 DOI: 10.3762/bjoc.10.108] [Citation(s) in RCA: 59] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2014] [Accepted: 04/14/2014] [Indexed: 11/23/2022] Open
Abstract
Background: Trifluoromethylated alkene scaffolds are known as useful structural motifs in pharmaceuticals and agrochemicals as well as functional organic materials. But reported synthetic methods usually require multiple synthetic steps and/or exhibit limitation with respect to access to tri- and tetrasubstituted CF3-alkenes. Thus development of new methodologies for facile construction of Calkenyl–CF3 bonds is highly demanded. Results: The photoredox reaction of alkenes with 5-(trifluoromethyl)dibenzo[b,d]thiophenium tetrafluoroborate, Umemoto’s reagent, as a CF3 source in the presence of [Ru(bpy)3]2+ catalyst (bpy = 2,2’-bipyridine) under visible light irradiation without any additive afforded CF3-substituted alkenes via direct Calkenyl–H trifluoromethylation. 1,1-Di- and trisubstituted alkenes were applicable to this photocatalytic system, providing the corresponding multisubstituted CF3-alkenes. In addition, use of an excess amount of the CF3 source induced double C–H trifluoromethylation to afford geminal bis(trifluoromethyl)alkenes. Conclusion: A range of multisubstituted CF3-alkenes are easily accessible by photoredox-catalyzed direct C–H trifluoromethylation of alkenes under mild reaction conditions. In particular, trifluoromethylation of triphenylethene derivatives, from which synthetically valuable tetrasubstituted CF3-alkenes are obtained, have never been reported so far. Remarkably, the present facile and straightforward protocol is extended to double trifluoromethylation of alkenes.
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Affiliation(s)
- Ren Tomita
- Chemical Resources Laboratory, Tokyo Institute of Technology, R1-27, 4259 Nagatsuta, Midori-ku, Yokohama 226-8503, Japan
| | - Yusuke Yasu
- Chemical Resources Laboratory, Tokyo Institute of Technology, R1-27, 4259 Nagatsuta, Midori-ku, Yokohama 226-8503, Japan
| | - Takashi Koike
- Chemical Resources Laboratory, Tokyo Institute of Technology, R1-27, 4259 Nagatsuta, Midori-ku, Yokohama 226-8503, Japan
| | - Munetaka Akita
- Chemical Resources Laboratory, Tokyo Institute of Technology, R1-27, 4259 Nagatsuta, Midori-ku, Yokohama 226-8503, Japan
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1581
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Li X, Gu X, Li Y, Li P. Aerobic Transition-Metal-Free Visible-Light Photoredox Indole C-3 Formylation Reaction. ACS Catal 2014. [DOI: 10.1021/cs5005129] [Citation(s) in RCA: 110] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Affiliation(s)
- Xiang Li
- Key Laboratory of Organic Synthesis
of
Jiangsu Province, College of Chemistry, Chemical Engineering,
and Materials Science, Soochow University, 199 RenAi Road, Suzhou, Jiangsu 215123, China
| | - Xiangyong Gu
- Key Laboratory of Organic Synthesis
of
Jiangsu Province, College of Chemistry, Chemical Engineering,
and Materials Science, Soochow University, 199 RenAi Road, Suzhou, Jiangsu 215123, China
| | - Yongjuan Li
- Key Laboratory of Organic Synthesis
of
Jiangsu Province, College of Chemistry, Chemical Engineering,
and Materials Science, Soochow University, 199 RenAi Road, Suzhou, Jiangsu 215123, China
| | - Pixu Li
- Key Laboratory of Organic Synthesis
of
Jiangsu Province, College of Chemistry, Chemical Engineering,
and Materials Science, Soochow University, 199 RenAi Road, Suzhou, Jiangsu 215123, China
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1582
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Su YM, Hou Y, Yin F, Xu YM, Li Y, Zheng X, Wang XS. Visible Light-Mediated C–H Difluoromethylation of Electron-Rich Heteroarenes. Org Lett 2014; 16:2958-61. [DOI: 10.1021/ol501094z] [Citation(s) in RCA: 168] [Impact Index Per Article: 16.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Yi-Ming Su
- Department
of Chemistry, University of Science and Technology of China, 96 Jinzhai Road, Hefei, Anhui 230026, China
| | - Yu Hou
- Department
of Chemistry, University of Science and Technology of China, 96 Jinzhai Road, Hefei, Anhui 230026, China
| | - Feng Yin
- Department
of Chemistry, University of Science and Technology of China, 96 Jinzhai Road, Hefei, Anhui 230026, China
| | - Yue-Ming Xu
- Department
of Chemistry, University of Science and Technology of China, 96 Jinzhai Road, Hefei, Anhui 230026, China
| | - Yan Li
- Department
of Chemistry, University of Science and Technology of China, 96 Jinzhai Road, Hefei, Anhui 230026, China
| | - Xiaoqi Zheng
- Department
of Chemistry, University of Science and Technology of China, 96 Jinzhai Road, Hefei, Anhui 230026, China
| | - Xi-Sheng Wang
- Department
of Chemistry, University of Science and Technology of China, 96 Jinzhai Road, Hefei, Anhui 230026, China
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1583
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Hou H, Zhu S, Pan F, Rueping M. Visible-Light Photoredox-Catalyzed Synthesis of Nitrones: Unexpected Rate Acceleration by Water in the Synthesis of Isoxazolidines. Org Lett 2014; 16:2872-5. [DOI: 10.1021/ol500893g] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Affiliation(s)
- Hong Hou
- Institute of Organic Chemistry and ‡Institute of Inorganic Chemistry, RWTH Aachen University, Landoltweg 1, D-52074 Aachen, Germany
| | - Shaoqun Zhu
- Institute of Organic Chemistry and ‡Institute of Inorganic Chemistry, RWTH Aachen University, Landoltweg 1, D-52074 Aachen, Germany
| | - Fangfang Pan
- Institute of Organic Chemistry and ‡Institute of Inorganic Chemistry, RWTH Aachen University, Landoltweg 1, D-52074 Aachen, Germany
| | - Magnus Rueping
- Institute of Organic Chemistry and ‡Institute of Inorganic Chemistry, RWTH Aachen University, Landoltweg 1, D-52074 Aachen, Germany
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1584
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Guo W, Cheng HG, Chen LY, Xuan J, Feng ZJ, Chen JR, Lu LQ, Xiao WJ. De NovoSynthesis of γ,γ-Disubstituted Butyrolactones through a Visible Light Photocatalytic Arylation-Lactonization Sequence. Adv Synth Catal 2014. [DOI: 10.1002/adsc.201400041] [Citation(s) in RCA: 67] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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1585
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Hong FJ, Low YY, Chong KW, Thomas NF, Kam TS. Biomimetic oxidative dimerization of anodically generated stilbene radical cations: effect of aromatic substitution on product distribution and reaction pathways. J Org Chem 2014; 79:4528-43. [PMID: 24754525 DOI: 10.1021/jo500559r] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
A systematic study of the electrochemical oxidation of 1,2-diarylalkenes was carried out with the focus on detailed product studies and variation of product type as a function of aromatic substitution. A reinvestigation of the electrochemical oxidation of 4,4'-dimethoxystilbene under various conditions was first carried out, and all products formed were fully characterized and quantitated. This was followed by a systematic investigation of the effect of aromatic substitution on the nature and distribution of the products. The aromatic substituents were found to fall into three main categories, viz., substrates in which the nature and position of the aromatic substituents gave rise to essentially the same products as 4,4'-dimethoxystilbene, for example, tetraaryltetrahydrofurans, dehydrotetralins, and aldehydes (p-MeO or p-NMe2 on one ring and X on the other ring, where X = o-MeO or p-alkyl, or m- or p-EWG; e.g., 4-methoxy-4'-trifluoromethylstilbene); those that gave rise to a mixture of indanyl (or tetralinyl) acetamides and dehydrotetralins (or pallidols) (both or one ring substituted by alkyl groups, e.g., 4,4'-dimethylstilbene); and those where strategic placement of donor groups, such as OMe and OH, led to the formation of ampelopsin F and pallidol-type carbon skeletons (e.g., 4,3',4'-trimethoxystilbene). Reaction pathways to rationalize the formation of the different products are presented.
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Affiliation(s)
- Fong-Jiao Hong
- Department of Chemistry, Faculty of Science, University of Malaya , 50603 Kuala Lumpur, Malaysia
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1586
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Majek M, Filace F, von Wangelin AJ. On the mechanism of photocatalytic reactions with eosin Y. Beilstein J Org Chem 2014; 10:981-9. [PMID: 24991248 PMCID: PMC4077370 DOI: 10.3762/bjoc.10.97] [Citation(s) in RCA: 188] [Impact Index Per Article: 18.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2014] [Accepted: 04/10/2014] [Indexed: 12/24/2022] Open
Abstract
A combined spectroscopic, synthetic, and apparative study has allowed a more detailed mechanistic rationalization of several recently reported eosin Y-catalyzed aromatic substitutions at arenediazonium salts. The operation of rapid acid-base equilibria, direct photolysis pathways, and radical chain reactions has been discussed on the basis of pH, solvent polarity, lamp type, absorption properties, and quantum yields. Determination of the latter proved to be an especially valuable tool for the distinction between radical chain and photocatalytic reactions.
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Affiliation(s)
- Michal Majek
- Institute of Organic Chemistry, University of Regensburg, Universitaetsstr. 31, 93040 Regensburg, Germany
| | - Fabiana Filace
- Institute of Organic Chemistry, University of Alcalá, Alcalá de Henares, Madrid, Spain
| | - Axel Jacobi von Wangelin
- Institute of Organic Chemistry, University of Regensburg, Universitaetsstr. 31, 93040 Regensburg, Germany
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1587
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Zhao Y, Li Z, Yang C, Lin R, Xia W. Visible-light photoredox catalysis enabled bromination of phenols and alkenes. Beilstein J Org Chem 2014; 10:622-7. [PMID: 24778712 PMCID: PMC3999835 DOI: 10.3762/bjoc.10.53] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2013] [Accepted: 02/03/2014] [Indexed: 11/23/2022] Open
Abstract
A mild and efficient methodology for the bromination of phenols and alkenes has been developed utilizing visible light-induced photoredox catalysis. The bromine was generated in situ from the oxidation of Br− by Ru(bpy)33+, both of which resulted from the oxidative quenching process.
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Affiliation(s)
- Yating Zhao
- State Key Lab of Urban Water Resource and Environment, The Academy of Fundamental and Interdisciplinary Sciences, Harbin Institute of Technology, Harbin 150080, China
| | - Zhe Li
- State Key Lab of Urban Water Resource and Environment, The Academy of Fundamental and Interdisciplinary Sciences, Harbin Institute of Technology, Harbin 150080, China
| | - Chao Yang
- State Key Lab of Urban Water Resource and Environment, The Academy of Fundamental and Interdisciplinary Sciences, Harbin Institute of Technology, Harbin 150080, China
| | - Run Lin
- State Key Lab of Urban Water Resource and Environment, The Academy of Fundamental and Interdisciplinary Sciences, Harbin Institute of Technology, Harbin 150080, China
| | - Wujiong Xia
- State Key Lab of Urban Water Resource and Environment, The Academy of Fundamental and Interdisciplinary Sciences, Harbin Institute of Technology, Harbin 150080, China
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1588
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Cai S, Yang K, Wang DZ. Gold Catalysis Coupled with Visible Light Stimulation: Syntheses of Functionalized Indoles. Org Lett 2014; 16:2606-9. [DOI: 10.1021/ol501071k] [Citation(s) in RCA: 60] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Affiliation(s)
- Shunyou Cai
- Laboratory of Chemical Genomics,
School of Chemical Biology and Biotechnology, Shenzhen Graduate School of Peking University, Shenzhen, China 518055
| | - Kai Yang
- Laboratory of Chemical Genomics,
School of Chemical Biology and Biotechnology, Shenzhen Graduate School of Peking University, Shenzhen, China 518055
| | - David Zhigang Wang
- Laboratory of Chemical Genomics,
School of Chemical Biology and Biotechnology, Shenzhen Graduate School of Peking University, Shenzhen, China 518055
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1589
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Nguyen TH, Maity S, Zheng N. Visible light mediated intermolecular [3 + 2] annulation of cyclopropylanilines with alkynes. Beilstein J Org Chem 2014; 10:975-80. [PMID: 24991247 PMCID: PMC4077375 DOI: 10.3762/bjoc.10.96] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2014] [Accepted: 04/04/2014] [Indexed: 11/27/2022] Open
Abstract
Intermolecular [3 + 2] annulation of cyclopropylanilines with alkynes is realized using visible light photoredox catalysis, yielding a variety of cyclic allylic amines in fair to good yields. This method exhibits significant group tolerance particularly with heterocycles. It can also be used to prepare complex heterocycles such as fused indolines.
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Affiliation(s)
- Theresa H Nguyen
- Department of Chemistry and Biochemistry, University of Arkansas, Fayetteville, Arkansas, 72701, USA
| | - Soumitra Maity
- Department of Chemistry and Biochemistry, University of Arkansas, Fayetteville, Arkansas, 72701, USA
| | - Nan Zheng
- Department of Chemistry and Biochemistry, University of Arkansas, Fayetteville, Arkansas, 72701, USA
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1590
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Xuan J, Xia XD, Zeng TT, Feng ZJ, Chen JR, Lu LQ, Xiao WJ. Visible-Light-Induced Formal [3+2] Cycloaddition for Pyrrole Synthesis under Metal-Free Conditions. Angew Chem Int Ed Engl 2014; 53:5653-6. [DOI: 10.1002/anie.201400602] [Citation(s) in RCA: 239] [Impact Index Per Article: 23.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2014] [Revised: 03/18/2014] [Indexed: 11/10/2022]
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1591
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Visible-Light-Induced Formal [3+2] Cycloaddition for Pyrrole Synthesis under Metal-Free Conditions. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201400602] [Citation(s) in RCA: 63] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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1592
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Miyake Y, Ashida Y, Nakajima K, Nishibayashi Y. Visible-Light-Mediated Addition of α-Aminoalkyl Radicals to [60]Fullerene by Using Photoredox Catalysts. Chemistry 2014; 20:6120-5. [DOI: 10.1002/chem.201304731] [Citation(s) in RCA: 58] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2013] [Indexed: 11/10/2022]
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1593
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Dai XJ, Xu XL, Cheng DP, Li XN. Visible-light photoredox-mediated oxidation of N-methyl tertiaryamines under catalyst free conditions: Direct synthesis of methylene-bridged bis-1,3-dicarbonyl compounds. CHINESE CHEM LETT 2014. [DOI: 10.1016/j.cclet.2014.01.021] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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1594
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Hasegawa E, Tateyama M, Hoshi T, Ohta T, Tayama E, Iwamoto H, Takizawa SY, Murata S. A photo-reagent system of benzimidazoline and Ru(bpy)3Cl2 to promote hexenyl radical cyclization and Dowd–Beckwith ring-expansion of α-halomethyl-substituted benzocyclic 1-alkanones. Tetrahedron 2014. [DOI: 10.1016/j.tet.2014.02.078] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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1595
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Wu W, Cui X, Zhao J. Hetero Bodipy-dimers as heavy atom-free triplet photosensitizers showing a long-lived triplet excited state for triplet-triplet annihilation upconversion. Chem Commun (Camb) 2014; 49:9009-11. [PMID: 23969566 DOI: 10.1039/c3cc45470c] [Citation(s) in RCA: 79] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Bodipy dimers in which the two different sub-units take an orthogonal orientation were prepared, which show strong absorption of visible light, long-lived triplet excited states (140.9 μs) and high singlet oxygen ((1)O2) quantum yields (64%). The dimers were used for triplet-triplet annihilation upconversion (quantum yield is up to 3.7%).
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Affiliation(s)
- Wanhua Wu
- State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, E-208 West Campus, Dalian 116024, P. R. China.
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1596
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Hu XQ, Chen JR, Wei Q, Liu FL, Deng QH, You-Quan Zou, Xiao WJ. Efficient Synthesis of Dihydropyrazoles by Halocyclization of β,γ-Unsaturated Hydrazones. European J Org Chem 2014. [DOI: 10.1002/ejoc.201402021] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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1597
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Zhong JJ, Meng QY, Liu B, Li XB, Gao XW, Lei T, Wu CJ, Li ZJ, Tung CH, Wu LZ. Cross-Coupling Hydrogen Evolution Reaction in Homogeneous Solution without Noble Metals. Org Lett 2014; 16:1988-91. [DOI: 10.1021/ol500534w] [Citation(s) in RCA: 131] [Impact Index Per Article: 13.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Jian-Ji Zhong
- Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry & University of Chinese Academy of Sciences, the Chinese Academy of Sciences, Beijing,100190, P. R. China
| | - Qing-Yuan Meng
- Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry & University of Chinese Academy of Sciences, the Chinese Academy of Sciences, Beijing,100190, P. R. China
| | - Bin Liu
- Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry & University of Chinese Academy of Sciences, the Chinese Academy of Sciences, Beijing,100190, P. R. China
| | - Xu-Bing Li
- Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry & University of Chinese Academy of Sciences, the Chinese Academy of Sciences, Beijing,100190, P. R. China
| | - Xue-Wang Gao
- Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry & University of Chinese Academy of Sciences, the Chinese Academy of Sciences, Beijing,100190, P. R. China
| | - Tao Lei
- Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry & University of Chinese Academy of Sciences, the Chinese Academy of Sciences, Beijing,100190, P. R. China
| | - Cheng-Juan Wu
- Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry & University of Chinese Academy of Sciences, the Chinese Academy of Sciences, Beijing,100190, P. R. China
| | - Zhi-Jun Li
- Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry & University of Chinese Academy of Sciences, the Chinese Academy of Sciences, Beijing,100190, P. R. China
| | - Chen-Ho Tung
- Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry & University of Chinese Academy of Sciences, the Chinese Academy of Sciences, Beijing,100190, P. R. China
| | - Li-Zhu Wu
- Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry & University of Chinese Academy of Sciences, the Chinese Academy of Sciences, Beijing,100190, P. R. China
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1598
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Xie J, Yuan X, Abdukader A, Zhu C, Ma J. Visible-light-promoted radical C-H trifluoromethylation of free anilines. Org Lett 2014; 16:1768-71. [PMID: 24597963 DOI: 10.1021/ol500469a] [Citation(s) in RCA: 97] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
The trifluoromethyl-substituted anilines are biologically active compounds and useful building blocks. In this communication, we have developed the first visible-light-induced radical trifluoromethylation of free anilines with the commercially available and easily handled Togni reagent at room temperature. The resulting products were successfully transformed into a variety of valuable fluorine-containing molecules and heterocyclic compounds. This protocol provides an economical and powerful route to trifluoromethylated free anilines.
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Affiliation(s)
- Jin Xie
- State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Nanjing University , Nanjing 210093, China
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1599
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1600
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Hopkinson MN, Sahoo B, Li JL, Glorius F. Dual Catalysis Sees the Light: Combining Photoredox with Organo-, Acid, and Transition-Metal Catalysis. Chemistry 2014; 20:3874-86. [DOI: 10.1002/chem.201304823] [Citation(s) in RCA: 579] [Impact Index Per Article: 57.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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