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Keerthika K, S BM, Geetharani K. Synthesis of α-Trifluoromethylated Ketones from α,β-Unsaturated Ketones via Catecholboron Enolates. J Org Chem 2024. [PMID: 39058387 DOI: 10.1021/acs.joc.4c01159] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/28/2024]
Abstract
Herein, we report a protocol for the synthesis of α-trifluoromethylated ketones through trifluoromethylation of the corresponding catecholboron enolates of α,β-unsaturated ketones. The reaction of the 1,4-hydroborated product of enones with the Togni II reagent affords the α-trifluoromethylated ketones without any catalyst or additive. Moreover, the protocol has been employed on a series of α,β-unsaturated ketones, including chalcones, substrate-bearing heterocycles, and bioactive molecules. Mechanistic studies suggest the involvement of a trifluoromethyl radical during the reaction.
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Affiliation(s)
- K Keerthika
- Department of Inorganic and Physical Chemistry, Indian Institute of Science, Bangalore 560012, India
| | - Bazil Muhammed S
- Department of Inorganic and Physical Chemistry, Indian Institute of Science, Bangalore 560012, India
| | - K Geetharani
- Department of Inorganic and Physical Chemistry, Indian Institute of Science, Bangalore 560012, India
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2
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Liu L, Wang Q, Li Y, Liu M, Liu B, Li Q, Feng K. Photodriven Radical Perfluoroalkylation-Thiolation of Unactivated Alkenes Enabled by Electron Donor-Acceptor Complex. Org Lett 2024; 26:2271-2275. [PMID: 38457924 DOI: 10.1021/acs.orglett.4c00462] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/10/2024]
Abstract
A clean and direct three-component radical 1,2-difunctionalization of various alkenes with perfluoroalkyl iodides and thiosulfonates enabled by the electron donor-acceptor complex has been developed under light illumination at room temperature. The approach offers a convenient and environmentally friendly route for the simultaneous incorporation of Csp3-Rf and Csp3-S bonds, affording valuable polyfunctionalized alkane derivatives containing fluorine and sulfur in satisfactory yields. Consequently, this methodology holds significant value and practicality in the field of organic synthesis.
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Affiliation(s)
- Lixin Liu
- School of Chemistry and Materials Engineering, Huizhou University, Huizhou, 516007, China
| | - Qian Wang
- School of Chemistry and Materials Engineering, Huizhou University, Huizhou, 516007, China
| | - Yuanhua Li
- School of Chemistry and Materials Engineering, Huizhou University, Huizhou, 516007, China
| | - Min Liu
- School of Chemistry and Materials Engineering, Huizhou University, Huizhou, 516007, China
| | - Bifu Liu
- School of Chemistry and Materials Engineering, Huizhou University, Huizhou, 516007, China
| | - Qiang Li
- Shandong Provincial Key Laboratory of Chemical Energy Storage and Novel Cell Technology, School of Chemistry and Chemical Engineering, Liaocheng University, Liaocheng, 252000, China
| | - Kejun Feng
- School of Chemistry and Materials Engineering, Huizhou University, Huizhou, 516007, China
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3
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Kanbara T, Arase M, Tanaka M, Yamaguchi A, Tagami K, Yajima T. Amine-catalyzed Synthesis of Fluorine-containing Polymers through Halogen Bonding. Chem Asian J 2023; 18:e202300035. [PMID: 36811265 DOI: 10.1002/asia.202300035] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2023] [Revised: 02/12/2023] [Accepted: 02/21/2023] [Indexed: 02/24/2023]
Abstract
Fluorine-containing polymers are one of the most useful materials among various polymers. In this study, we have developed synthesis methods for fluorine-containing polymers through sequential and chain polymerization based on the generation of perfluoroalkyl radicals by photoirradiation halogen bonding of perfluoroalkyl iodide and amines. In sequential polymerization, fluoroalkyl-alkyl-alternating polymers were synthesized by the polyaddition of diene and diiodoperfluoroalkane. In chain polymerization, polymers with perfluoroalkyl terminals were synthesized by polymerization of general-purpose monomers, with perfluoroalkyl iodide as the initiating species. Block polymers were also synthesized by successive chain polymerization to the polyaddition product.
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Affiliation(s)
- Tadashi Kanbara
- Department of Chemistry, Ochanomizu University, 2-1-1 Otsuka, Bunkyo-ku, Tokyo, Japan
| | - Mizuki Arase
- Department of Chemistry, Ochanomizu University, 2-1-1 Otsuka, Bunkyo-ku, Tokyo, Japan
| | - Miyu Tanaka
- Department of Chemistry, Ochanomizu University, 2-1-1 Otsuka, Bunkyo-ku, Tokyo, Japan
| | - Airi Yamaguchi
- Department of Chemistry, Ochanomizu University, 2-1-1 Otsuka, Bunkyo-ku, Tokyo, Japan
| | - Koto Tagami
- Department of Chemistry, Ochanomizu University, 2-1-1 Otsuka, Bunkyo-ku, Tokyo, Japan
| | - Tomoko Yajima
- Department of Chemistry, Ochanomizu University, 2-1-1 Otsuka, Bunkyo-ku, Tokyo, Japan
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4
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Tagami K, Ofuji Y, Kanbara T, Yajima T. Metal-free visible-light-induced hydroxy-perfluoroalkylation of conjugated olefins using enamine catalyst. RSC Adv 2022; 12:32790-32795. [PMID: 36425182 PMCID: PMC9667149 DOI: 10.1039/d2ra06679c] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2022] [Accepted: 11/05/2022] [Indexed: 07/22/2023] Open
Abstract
We developed a simple and sustainable method for the hydroxy-perfluoroalkylation of electron-deficient conjugated olefins and styrenes. In this protcol, in situ generated enamine forms electron-donor-accepter (EDA) complexes with perfluoroalkyl iodide, and reaction proceed with visible-light irradiation. Tertiary amine also interacts with perfluoroalkyl iodide via halogen-bonding, promoting the perfluoroalkyl radical generation. This reaction does not require any transition-metal or photoredox catalyst, and gaseous oxygen is used as the green hydroxy source. Moreover, various commercially available substrates and perfluoroalkyl iodides were tolerated, affording the desired hydroxy-perfluoroalkylated products in good to moderate yields (>50 examples, up to 90%).
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Affiliation(s)
- Koto Tagami
- Department of Chemistry, Faculty of Science, Ochanomizu University Otsuka, Bunkyo-ku Tokyo 112-8610 Japan
| | - Yu Ofuji
- Department of Chemistry, Faculty of Science, Ochanomizu University Otsuka, Bunkyo-ku Tokyo 112-8610 Japan
| | - Tadashi Kanbara
- Department of Chemistry, Faculty of Science, Ochanomizu University Otsuka, Bunkyo-ku Tokyo 112-8610 Japan
| | - Tomoko Yajima
- Department of Chemistry, Faculty of Science, Ochanomizu University Otsuka, Bunkyo-ku Tokyo 112-8610 Japan
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5
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Cheng D, Gao X, Huang J, Meng XZ. Crystal structure and Hirshfeld surface analysis of 7,7-dimethyl-2-phenyl-3,3a,4,6,7,8,9,9a-octahydro-1 H-benzo[ f]isoindole-1,5(2 H)-dione. Acta Crystallogr E Crystallogr Commun 2022; 78:373-376. [PMID: 35492273 PMCID: PMC8983980 DOI: 10.1107/s2056989022002353] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2022] [Accepted: 03/01/2022] [Indexed: 11/11/2022]
Abstract
The crystal structure and Hirshfeld surface analysis of 7,7-dimethyl-2-phenyl-3,3a,4,6,7,8,9,9a-octahydro-1H-benzo[f]isoindole-1,5(2H)-dione obtained via the reaction of N-allyl-N-phenylacrylamide with 3-iodocyclohex-2-en-1-one using PdCl2(PPh3)2 as a catalyst,, is reported. The title compound, C20H23NO2, was obtained via the reaction of N-allyl-N-phenylacrylamide with 3-iodocyclohex-2-en-1-one using PdCl2(PPh3)2 as a catalyst. The compound crystallizes in the monoclinic space group P21/c. The fused-ring system is not planar and the five- and six-membered rings are trans-fused. The molecular geometry is partially stabilized by an intramolecular C—H⋯O hydrogen bond, forming an S(6) ring motif. In the crystal, molecules are linked by C—H⋯O and C—H⋯π interactions into a three-dimensional network. To further analyse the intermolecular interactions, a Hirshfeld surface analysis was performed. The results indicate that the most important contributions to the overall surface are from H⋯H (65.5%), O⋯H/H⋯O (17.5%) and C⋯H/H⋯C (14.3%) interactions.
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Jana K, Studer A. Allylboronic Esters as Acceptors in Radical Addition, Boron 1,2-Migration, and Trapping Cascades. Org Lett 2022; 24:1100-1104. [PMID: 35080407 PMCID: PMC8822490 DOI: 10.1021/acs.orglett.2c00039] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
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Radical 1,3-carboheteroarylation
and 1,3-hydroalkylation of allylboronic
esters comprising a 1,2-boron shift is reported. Allylboronic esters
are generally used in synthesis as allylation reagents, where the
boronic ester moiety gets lost. In the introduced cascades, alkylboronic
esters are obtained with the boron entity remaining in the product.
The carboheteroarylation of the allylboronic esters are conducted
without a metal catalyst, and the 1,3-hydroalkylation is achieved
using iron catalysis. Both reactions work efficiently under mild conditions.
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Affiliation(s)
- Kalipada Jana
- Organisch-Chemisches Institut, Westfälische Wilhelms-Universität Corrensstraße 40, 48149 Münster, Germany
| | - Armido Studer
- Organisch-Chemisches Institut, Westfälische Wilhelms-Universität Corrensstraße 40, 48149 Münster, Germany
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Li W, Liu R, Li R, Wang S, Li D, Yang J. Catalyst‐Free and Oxidant‐Free Cascade Difluoroalkylation and Controllable C−F Bond Activation of Aryl Enol Acetates for the Synthesis of β‐Fluoroenones and β‐Enaminones. Adv Synth Catal 2021. [DOI: 10.1002/adsc.202100681] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Wenshuang Li
- School of Chemistry and Chemical Engineering Ningxia University 489 Helanshan West Road Yinchuan 750021 People's Republic of China
| | - Ruyan Liu
- School of Chemistry and Chemical Engineering Ningxia University 489 Helanshan West Road Yinchuan 750021 People's Republic of China
| | - Ruonan Li
- School of Chemistry and Chemical Engineering Ningxia University 489 Helanshan West Road Yinchuan 750021 People's Republic of China
| | - Shihaozhi Wang
- School of Chemistry and Chemical Engineering Ningxia University 489 Helanshan West Road Yinchuan 750021 People's Republic of China
| | - Dianjun Li
- State Key Laboratory of High-Efficiency Utilization of Coal and Green Chemical Engineering School of Chemistry and Chemical Engineering Ningxia University 489 Helanshan West Road Yinchuan 750021 People's Republic of China
- School of Chemistry and Chemical Engineering Ningxia University 489 Helanshan West Road Yinchuan 750021 People's Republic of China
| | - Jinhui Yang
- State Key Laboratory of High-Efficiency Utilization of Coal and Green Chemical Engineering School of Chemistry and Chemical Engineering Ningxia University 489 Helanshan West Road Yinchuan 750021 People's Republic of China
- School of Chemistry and Chemical Engineering Ningxia University 489 Helanshan West Road Yinchuan 750021 People's Republic of China
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