1
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Hannam A, Kankraisri P, Thombare KR, Meher P, Jean A, Hilton ST, Murarka S, Arseniyadis S. Visible light-mediated difluoromethylation/cyclization in batch and flow: scalable synthesis of CHF 2-containing benzimidazo- and indolo[2,1- a]isoquinolin-6(5 H)-ones. Chem Commun (Camb) 2024. [PMID: 38984848 DOI: 10.1039/d4cc02557a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/11/2024]
Abstract
We report here a practical and cost-effective method for the synthesis of CHF2-containing benzimidazo- and indolo[2,1,a]-isoquinolin-6(5H)-ones through a visible light-mediated difluoromethylation/cyclization cascade. The method, which affords functionalized multifused N-heterocyclic scaffolds in moderate to high yields under mild reaction conditions, is also easily scalable using low-cost 3D printed photoflow reactors.
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Affiliation(s)
- Al Hannam
- Department of Chemistry, Queen Mary University of London, Mile End Road, E1 4NS, London, UK.
| | - Phinyada Kankraisri
- Department of Chemistry, Queen Mary University of London, Mile End Road, E1 4NS, London, UK.
| | - Karan R Thombare
- Department of Chemistry, Indian Institute of Technology Jodhpur, Karwar-342037, Rajasthan, India.
| | - Prahallad Meher
- Department of Chemistry, Indian Institute of Technology Jodhpur, Karwar-342037, Rajasthan, India.
| | - Alexandre Jean
- Industrial Research Centre, Oril Industrie, 13 rue Desgenétais, 76210, Bolbec, France
| | - Stephen T Hilton
- UCL School of Pharmacy, University College London, 29-39 Brunswick Square, WC1N 1AX, London, UK
| | - Sandip Murarka
- Department of Chemistry, Indian Institute of Technology Jodhpur, Karwar-342037, Rajasthan, India.
| | - Stellios Arseniyadis
- Department of Chemistry, Queen Mary University of London, Mile End Road, E1 4NS, London, UK.
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2
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Yamamoto T, Asakura M, Yamanomoto K, Shibata T, Endo K. Creation of a Chiral All-Carbon Quaternary Center Induced by CF 3 and CH 3 Substituents via Cu-Catalyzed Asymmetric Conjugate Addition. Org Lett 2024; 26:5312-5317. [PMID: 38869935 PMCID: PMC11217942 DOI: 10.1021/acs.orglett.4c01691] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2024] [Revised: 06/05/2024] [Accepted: 06/10/2024] [Indexed: 06/14/2024]
Abstract
Cu-catalyzed asymmetric construction of a chiral quaternary center bearing CH3 and CF3 groups was achieved with high to excellent enantioselectivity using our originally developed ligands. The asymmetric conjugate addition of Me3Al to β-CF3-substituted enones and unsaturated ketoesters proceeded efficiently. The use of unsaturated ketoesters gives optically active furanones in high yields with high enantioselectivities. The perfluoroalkyl-substituted enone does not seem to be favorable in the present reaction.
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Affiliation(s)
- Taiyo Yamamoto
- Department
of Chemistry, Faculty of Science, Tokyo
University of Science, Shinjuku, Tokyo 162-8601, Japan
| | - Masayuki Asakura
- Department
of Chemistry, Faculty of Science, Tokyo
University of Science, Shinjuku, Tokyo 162-8601, Japan
| | - Ken Yamanomoto
- Department
of Chemistry, Faculty of Science, Tokyo
University of Science, Shinjuku, Tokyo 162-8601, Japan
| | - Takanori Shibata
- Department
of Chemistry and Biochemistry, Graduate School of Science and Technology, Waseda University, Shinjuku, Tokyo 169-8555, Japan
| | - Kohei Endo
- Department
of Chemistry, Faculty of Science, Tokyo
University of Science, Shinjuku, Tokyo 162-8601, Japan
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3
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Ye ZP, Guo M, Ye YQ, Yuan CP, Wang HL, Yang JS, Chen HB, Xiang HY, Chen K, Yang H. Iodine(III)-Mediated Trifluoroacetylation of a C(sp 2)-H or C(sp)-H Bond with Masked Trifluoroacyl Reagents. Org Lett 2024; 26:5196-5201. [PMID: 38858221 DOI: 10.1021/acs.orglett.4c01780] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/12/2024]
Abstract
A novel strategy for incorporating a trifluoroacetyl functionality into a range of structurally varied unsaturated bonds was developed by using PhI(OCOMe)2 as an oxidant with a masked trifluoroacyl reagent as a trifluoroacetyl radical precursor. The oxidative decarboxylation of the masked trifluoroacyl precursor followed by a tandem radical process provides versatile access to 5-exo-trig cyclization of N-arylacrylamides, direct C(sp2)-H trifluoroacetylation of quinolines, isoquinoline, 2H-indazole, and quinoxalin-2(1H)-ones, and C(sp)-H trifluoroacetylation of alkynes. This protocol is characterized by mild reaction conditions, operational simplicity, and broad functional group compatibility.
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Affiliation(s)
- Zhi-Peng Ye
- College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, P. R. China
| | - Meng Guo
- College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, P. R. China
| | - Yong-Qing Ye
- College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, P. R. China
| | - Chu-Ping Yuan
- College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, P. R. China
| | - Hai-Long Wang
- College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, P. R. China
| | - Jing-Song Yang
- College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, P. R. China
| | - Hong-Bin Chen
- College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, P. R. China
- Jiangxi Time Chemical Company, Ltd., Fuzhou 344800, P. R. China
| | - Hao-Yue Xiang
- College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, P. R. China
| | - Kai Chen
- College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, P. R. China
- Xiangjiang Laboratory, Changsha 410205, P. R. China
| | - Hua Yang
- College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, P. R. China
- Xiangjiang Laboratory, Changsha 410205, P. R. China
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4
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Li Y, Dong D, Chen L, Du H, Zhao C, Bai X, Chen L, Li Y, Zeng X, Dixneuf PH, Zhang M. Selective Access to Functional Fluoroenones via Palladium-Catalyzed Selenofluoroalkylacylation of Terminal Alkynes. Org Lett 2024; 26:906-911. [PMID: 38240526 DOI: 10.1021/acs.orglett.3c04191] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2024]
Abstract
The trifluoromethylacyl group (-COCF3) is an important motif and widely studied in catalysis, medicinal chemistry, and materials science. Herein, a novel palladium-catalyzed selenofluoroalkylacylation of terminal alkynes with commercially available fluoroalkyl anhydride and diorganyl diselenides to afford β-seleno and aryl/alkyl disubstituted enones under mild conditions is disclosed. In addition, selenodifluoroacetylations and selenoperfluoroacetylations are also suitable for this reaction. Mechanistic studies reveal that this reaction proceeds via an oxidative radical-polar crossover process.
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Affiliation(s)
- Ya Li
- School of Environmental and Chemical Engineering, Wuyi University, Jiangmen 529020, P. R. China
| | - Dian Dong
- School of Environmental and Chemical Engineering, Wuyi University, Jiangmen 529020, P. R. China
| | - Lintong Chen
- School of Environmental and Chemical Engineering, Wuyi University, Jiangmen 529020, P. R. China
| | - Hongxuan Du
- School of Environmental and Chemical Engineering, Wuyi University, Jiangmen 529020, P. R. China
| | - Cong Zhao
- School of Environmental and Chemical Engineering, Wuyi University, Jiangmen 529020, P. R. China
| | - Xiaoyan Bai
- School of Environmental and Chemical Engineering, Wuyi University, Jiangmen 529020, P. R. China
| | - Lu Chen
- School of Environmental and Chemical Engineering, Wuyi University, Jiangmen 529020, P. R. China
| | - Yibiao Li
- School of Environmental and Chemical Engineering, Wuyi University, Jiangmen 529020, P. R. China
| | - Xianghua Zeng
- College of Biological, Chemical Science and Engineering, Jiaxing University, Jiaxing 314001, P. R. China
| | | | - Min Zhang
- Key Lab of Functional Molecular Engineering of Guangdong Province, School of Chemistry and Chemical Engineering, South China University of Technology, Wushan Rd-381, Guangzhou 510641, P. R. China
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5
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Tan Y, Huang H. Catalyst- and additive-free cascade radical addition/cyclization of N-arylacrylamides with trifluoropyruvates. Chem Commun (Camb) 2023; 59:13462-13465. [PMID: 37877176 DOI: 10.1039/d3cc04542k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2023]
Abstract
Herein, we introduce a photocatalyst- and additive-free method for the preparation of valuable 3,3-disubstituted oxindoles bearing trifluoromethyl alcohol moieties from readily available acrylamides and cheap trifluoropyruvates. The excited trifluoropyruvates under ultraviolet-light irradiation react efficiently with acrylamides delivering a variety of trifluoromethyl oxindoles with broad functional group tolerance and moderate to good yields. This protocol features mild reaction conditions, simple operation and ready scalability.
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Affiliation(s)
- Yongbo Tan
- Key Laboratory for Green Organic Synthesis and Application of Hunan Province, Key Laboratory of Environmentally Friendly Chemistry and Application of Ministry of Education, College of Chemistry, Xiangtan University, Xiangtan 411105, China.
| | - Huawen Huang
- Key Laboratory for Green Organic Synthesis and Application of Hunan Province, Key Laboratory of Environmentally Friendly Chemistry and Application of Ministry of Education, College of Chemistry, Xiangtan University, Xiangtan 411105, China.
- School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, 453007, P. R. China
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6
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Du HW, Du YD, Zeng XW, Shu W. Access to Trifluoromethylketones from Alkyl Bromides and Trifluoroacetic Anhydride by Photocatalysis. Angew Chem Int Ed Engl 2023; 62:e202308732. [PMID: 37534823 DOI: 10.1002/anie.202308732] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2023] [Revised: 08/02/2023] [Accepted: 08/03/2023] [Indexed: 08/04/2023]
Abstract
Aliphatic trifluoromethyl ketones are a type of unique fluorine-containing subunit which play a significant role in altering the physical and biological properties of molecules. Catalytic methods to provide direct access to aliphatic trifluoromethyl ketones are highly desirable yet remain underdeveloped, partially owing to the high reactivity and instability of trifluoroacetyl radical. Herein, we report a photocatalytic synthesis of trifluoromethyl ketones from alkyl bromides with trifluoroacetic anhydride. The reaction features dual visible-light and halogen-atom-transfer catalysis, followed by an enabling radical-radical cross-coupling of an alkyl radical with a stabilized trifluoromethyl radical. The reaction provides straightforward access to aliphatic trifluoromethyl ketones from readily available and cost-effective alkyl halides and trifluoroacetic anhydride (TFAA).
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Affiliation(s)
- Hai-Wu Du
- Shenzhen Grubbs Institute and Department of Chemistry, Southern University of Science and Technology, Shenzhen, 518055, Guangdong, P. R. China
| | - Yi-Dan Du
- Shenzhen Grubbs Institute and Department of Chemistry, Southern University of Science and Technology, Shenzhen, 518055, Guangdong, P. R. China
| | - Xian-Wang Zeng
- Shenzhen Grubbs Institute and Department of Chemistry, Southern University of Science and Technology, Shenzhen, 518055, Guangdong, P. R. China
| | - Wei Shu
- Shenzhen Grubbs Institute and Department of Chemistry, Southern University of Science and Technology, Shenzhen, 518055, Guangdong, P. R. China
- State Key Laboratory of Elemento-Organic Chemistry, Nankai University, 300071, Tianjin, P. R. China
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7
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Hu X, Tao M, Gong K, Feng Q, Hu X, Li Y, Sun S, Liang D. Electrochemical or Photoelectrochemical Alkenylpolyfluoroalkylation of 3-Aza-1,5-dienes: Regioselective Entry to Polyfluoroalkylated 4-Pyrrolin-2-ones. J Org Chem 2023; 88:12935-12948. [PMID: 37673796 DOI: 10.1021/acs.joc.3c00790] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/08/2023]
Abstract
An electrochemical or photoelectrochemical regioselective polyfluoroalkylation/cyclization cascade of 3-aza-1,5-dienes with sodium fluoroalkanesulfinates is presented. This protocol proceeds with a broad substrate scope and good functional group tolerance under mild, oxidant-free, transition-metal-free, and electrolyte-free conditions to provide 3-polyfluoroalkylated 4-pyrrolin-2-ones in one step from readily available N-vinylacrylamides, and it is readily scalable to the Gram scale.
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Affiliation(s)
- Xi Hu
- Yunnan Key Laboratory of Metal-Organic Molecular Materials and Device, School of Chemistry and Chemical Engineering, Kunming University, Kunming 650214, China
| | - Minglin Tao
- Yunnan Key Laboratory of Metal-Organic Molecular Materials and Device, School of Chemistry and Chemical Engineering, Kunming University, Kunming 650214, China
| | - Kaixing Gong
- Yunnan Key Laboratory of Metal-Organic Molecular Materials and Device, School of Chemistry and Chemical Engineering, Kunming University, Kunming 650214, China
| | - Qin Feng
- Yunnan Key Laboratory of Metal-Organic Molecular Materials and Device, School of Chemistry and Chemical Engineering, Kunming University, Kunming 650214, China
| | - Xiao Hu
- Yunnan Key Laboratory of Metal-Organic Molecular Materials and Device, School of Chemistry and Chemical Engineering, Kunming University, Kunming 650214, China
| | - Yanni Li
- Yunnan Key Laboratory of Metal-Organic Molecular Materials and Device, School of Chemistry and Chemical Engineering, Kunming University, Kunming 650214, China
| | - Shaoguang Sun
- Medical College, Panzhihua University, Panzhihua 617000, China
| | - Deqiang Liang
- Yunnan Key Laboratory of Metal-Organic Molecular Materials and Device, School of Chemistry and Chemical Engineering, Kunming University, Kunming 650214, China
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8
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Lin D, Coe M, Krishnamurti V, Ispizua-Rodriguez X, Surya Prakash GK. Recent Advances in Visible Light-Mediated Radical Fluoro-alkylation, -alkoxylation, -alkylthiolation, -alkylselenolation, and -alkylamination. CHEM REC 2023; 23:e202300104. [PMID: 37212421 DOI: 10.1002/tcr.202300104] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2023] [Revised: 04/20/2023] [Indexed: 05/23/2023]
Abstract
In the last few years, many reagents and protocols have been developed to allow for the efficient fluorofunctionalization of a diverse set of scaffolds ranging from alkanes, alkenes, alkynes, and (hetero)arenes. The concomitant rise of organofluorine chemistry and visible light-mediated synthesis have synergistically expanded the fields and have mutually benefitted from developments in both fields. In this context, visible light driven formations of radicals containing fluorine have been a major focus for the discovery of new bioactive compounds. This review details the recent advances and progress made in visible light-mediated fluoroalkylation and heteroatom centered radical generation.
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Affiliation(s)
- Daniel Lin
- Loker Hydrocarbon Research Institute Department of Chemistry, University of Southern California, 837 Bloom Walk, 90089-1661, Los Angeles, CA, USA
| | - Matthew Coe
- Loker Hydrocarbon Research Institute Department of Chemistry, University of Southern California, 837 Bloom Walk, 90089-1661, Los Angeles, CA, USA
| | - Vinayak Krishnamurti
- Loker Hydrocarbon Research Institute Department of Chemistry, University of Southern California, 837 Bloom Walk, 90089-1661, Los Angeles, CA, USA
| | - Xanath Ispizua-Rodriguez
- Loker Hydrocarbon Research Institute Department of Chemistry, University of Southern California, 837 Bloom Walk, 90089-1661, Los Angeles, CA, USA
| | - G K Surya Prakash
- Loker Hydrocarbon Research Institute Department of Chemistry, University of Southern California, 837 Bloom Walk, 90089-1661, Los Angeles, CA, USA
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9
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Kawamura S, Sodeoka M. Understanding and Controlling Fluorinated Diacyl Peroxides and Fluoroalkyl Radicals in Alkene Fluoroalkylations. CHEM REC 2023; 23:e202300202. [PMID: 37522613 DOI: 10.1002/tcr.202300202] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2023] [Revised: 07/11/2023] [Indexed: 08/01/2023]
Abstract
The demand for practical methods for the synthesis of novel fluoroalkyl molecules is increasing owing to their diverse applications. Our group has achieved efficient difunctionalizing fluoroalkylations of alkenes using fluorinated carboxylic anhydrides as user-friendly fluoroalkyl sources. Fluorinated diacyl peroxide, prepared in situ from carboxylic anhydrides, enables the development of novel reactions when used as a radical fluoroalkylating reagent. In this account, we aim to provide an in-depth understanding of the structure, bonding, and reactivity of fluorinated diacyl peroxides and radicals as well as their control in fluoroalkylation reactions. In the first part of this account, the physical properties and reactivity of diacyl peroxides and fluoroalkyl radicals are described. In the subsequent part, we categorize the reactions into copper-catalyzed and metal-free methods utilizing the oxidizing properties of fluorinated diacyl peroxides. We also outline examples and mechanisms.
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Affiliation(s)
- Shintaro Kawamura
- Catalysis and Integrated Research Group, RIKEN Center for Sustainable Resource Science, 2-1 Hirosawa, Wako, Saitama, 351-0198, Japan
- Synthetic Organic Chemistry Laboratory, RIKEN Cluster for Pioneering Research, 2-1 Hirosawa, Wako, Saitama, 351-0198, Japan
| | - Mikiko Sodeoka
- Catalysis and Integrated Research Group, RIKEN Center for Sustainable Resource Science, 2-1 Hirosawa, Wako, Saitama, 351-0198, Japan
- Synthetic Organic Chemistry Laboratory, RIKEN Cluster for Pioneering Research, 2-1 Hirosawa, Wako, Saitama, 351-0198, Japan
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