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Zhou Y, Wu Z, Xu J, Zhang Z, Zheng H, Zhu G. Fluorine-Effect-Enabled Photocatalytic 4-Exo-Trig Cyclization Cascade to Access Fluoroalkylated Cyclobutanes. Angew Chem Int Ed Engl 2024; 63:e202405678. [PMID: 38739309 DOI: 10.1002/anie.202405678] [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: 03/23/2024] [Revised: 05/12/2024] [Accepted: 05/13/2024] [Indexed: 05/14/2024]
Abstract
Cyclobutanes are popular structural units in bioactive compounds and versatile intermediates in synthetic chemistry, but their synthesis is challenging owing to high ring strain. In this study, a novel method for highly regio- and diastereoselective synthesis of fluoroalkylcyclobutanes bearing vicinal quaternary and tertiary stereocenters is realized by a photocatalytic 4-exo-trig cyclization cascade of thioalkynes or trifluoromethylalkenes. Density functional theory calculations reveal that a unique fluorine effect, arising from hyperconjugative π→σ*C-F interactions, accounts for the regio-reversed radical addition at the sterically hindered alkene carbon, which facilitates an unprecedented 4-exo-trig ring closure. This chemistry enables the direct and controllable construction of medicinally valuable quaternary-carbon-containing cyclobutanes from readily available raw materials, nicely complementing the existing methods.
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Affiliation(s)
- Yulu Zhou
- Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, College of Chemistry and Materials Science, Zhejiang Normal University, 688 Yingbin Road, Jinhua, 321004, P. R. China
| | - Zhenzhen Wu
- Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, College of Chemistry and Materials Science, Zhejiang Normal University, 688 Yingbin Road, Jinhua, 321004, P. R. China
| | - Jinming Xu
- Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, College of Chemistry and Materials Science, Zhejiang Normal University, 688 Yingbin Road, Jinhua, 321004, P. R. China
| | - Zuxiao Zhang
- Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, College of Chemistry and Materials Science, Zhejiang Normal University, 688 Yingbin Road, Jinhua, 321004, P. R. China
| | - Hanliang Zheng
- Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, College of Chemistry and Materials Science, Zhejiang Normal University, 688 Yingbin Road, Jinhua, 321004, P. R. China
| | - Gangguo Zhu
- Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, College of Chemistry and Materials Science, Zhejiang Normal University, 688 Yingbin Road, Jinhua, 321004, P. R. China
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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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Shimose A, Ishigaki S, Sato Y, Nogami J, Toriumi N, Uchiyama M, Tanaka K, Nagashima Y. Dearomative Construction of 2D/3D Frameworks from Quinolines via Nucleophilic Addition/Borate-Mediated Photocycloaddition. Angew Chem Int Ed Engl 2024:e202403461. [PMID: 38803130 DOI: 10.1002/anie.202403461] [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: 02/19/2024] [Revised: 05/24/2024] [Accepted: 05/27/2024] [Indexed: 05/29/2024]
Abstract
Dearomative construction of multiply-fused 2D/3D frameworks, composed of aromatic two-dimensional (2D) rings and saturated three-dimensional (3D) rings, from readily available quinolines has greatly contributed to drug discovery. However, dearomative cycloadditions of quinolines in the presence of photocatalysts usually afford 5,6,7,8-tetrahydroquinoline (THQ)-based polycycles, and dearomative access to 1,2,3,4-THQ-based structures remains limited. Herein, we present a chemo-, regio-, diastereo-, and enantioselective dearomative transformation of quinolines into 1,2,3,4-THQ-based 6-6-4-membered rings without any catalyst, through a combination of nucleophilic addition and borate-mediated [2+2] photocycloaddition. Detailed mechanistic studies revealed that the photoexcited borate complex, generated from quinoline, organolithium, and HB(pin), accelerates the cycloaddition and suppresses the rearomatization that usually occurs in conventional photocycloaddition. Based on our mechanistic analysis, we also developed further photoinduced cycloadditions affording other types of 2D/3D frameworks from isoquinoline and phenanthrene.
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Affiliation(s)
- Asuha Shimose
- Department of Chemical Science and Engineering, Tokyo Institute of Technology O-okayama, Meguro-ku, Tokyo, 152-8550, Japan
| | - Shiho Ishigaki
- Department of Chemical Science and Engineering, Tokyo Institute of Technology O-okayama, Meguro-ku, Tokyo, 152-8550, Japan
| | - Yu Sato
- Department of Chemical Science and Engineering, Tokyo Institute of Technology O-okayama, Meguro-ku, Tokyo, 152-8550, Japan
| | - Juntaro Nogami
- Department of Chemical Science and Engineering, Tokyo Institute of Technology O-okayama, Meguro-ku, Tokyo, 152-8550, Japan
| | - Naoyuki Toriumi
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan
| | - Masanobu Uchiyama
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan
| | - Ken Tanaka
- Department of Chemical Science and Engineering, Tokyo Institute of Technology O-okayama, Meguro-ku, Tokyo, 152-8550, Japan
| | - Yuki Nagashima
- Department of Chemical Science and Engineering, Tokyo Institute of Technology O-okayama, Meguro-ku, Tokyo, 152-8550, Japan
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan
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4
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Voloshkin VA, Villa M, Martynova EA, Beliš M, Van Hecke K, Ceroni P, Nolan SP. Synthesis of cyclobutane-fused chromanones via gold-mediated photocatalysis. Chem Sci 2024; 15:4571-4580. [PMID: 38516071 PMCID: PMC10952090 DOI: 10.1039/d3sc06675d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2023] [Accepted: 02/20/2024] [Indexed: 03/23/2024] Open
Abstract
Energy transfer (EnT) photocatalysis has emerged as a valuable tool for constructing complex organic scaffolds via [2 + 2]-cycloaddition reactions. Herein, we present the use of [Au(SIPr)(Cbz)] as a sensitizer for the [2 + 2]-cycloaddition of coumarins and unactivated alkenes. Widely used in EnT catalysis, iridium and organic sensitizers proved less efficient under the examined catalytic conditions. The developed protocol permits the synthesis of cyclobutane-fused chromanones from readily available starting materials. A wide range of alkenes and substituted coumarins, including naturally occurring compounds, were reacted under mild conditions leading to structurally complex products with good functional group tolerance. Mechanistic studies reveal a previously overlooked reaction pathway for energy transfer catalysis involving coumarins.
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Affiliation(s)
- Vladislav A Voloshkin
- Department of Chemistry, Centre for Sustainable Chemistry, Ghent University Krijgslaan 281, S-3 9000 Ghent Belgium
| | - Marco Villa
- Department of Chemistry "Giacomo Ciamician", Center for Chemical Catalysis-C3, University of Bologna Via Selmi, 2 40126 Bologna Italy
| | - Ekaterina A Martynova
- Department of Chemistry, Centre for Sustainable Chemistry, Ghent University Krijgslaan 281, S-3 9000 Ghent Belgium
| | - Marek Beliš
- Department of Chemistry, Centre for Sustainable Chemistry, Ghent University Krijgslaan 281, S-3 9000 Ghent Belgium
| | - Kristof Van Hecke
- Department of Chemistry, Centre for Sustainable Chemistry, Ghent University Krijgslaan 281, S-3 9000 Ghent Belgium
| | - Paola Ceroni
- Department of Chemistry "Giacomo Ciamician", Center for Chemical Catalysis-C3, University of Bologna Via Selmi, 2 40126 Bologna Italy
| | - Steven P Nolan
- Department of Chemistry, Centre for Sustainable Chemistry, Ghent University Krijgslaan 281, S-3 9000 Ghent Belgium
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Chatgilialoglu C, Barata-Vallejo S, Gimisis T. Radical Reactions in Organic Synthesis: Exploring in-, on-, and with-Water Methods. Molecules 2024; 29:569. [PMID: 38338314 PMCID: PMC10856544 DOI: 10.3390/molecules29030569] [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: 12/19/2023] [Revised: 01/18/2024] [Accepted: 01/19/2024] [Indexed: 02/12/2024] Open
Abstract
Radical reactions in water or aqueous media are important for organic synthesis, realizing high-yielding processes under non-toxic and environmentally friendly conditions. This overview includes (i) a general introduction to organic chemistry in water and aqueous media, (ii) synthetic approaches in, on, and with water as well as in heterogeneous phases, (iii) reactions of carbon-centered radicals with water (or deuterium oxide) activated through coordination with various Lewis acids, (iv) photocatalysis in water and aqueous media, and (v) synthetic applications bioinspired by naturally occurring processes. A wide range of chemical processes and synthetic strategies under different experimental conditions have been reviewed that lead to important functional group translocation and transformation reactions, leading to the preparation of complex molecules. These results reveal how water as a solvent/medium/reagent in radical chemistry has matured over the last two decades, with further discoveries anticipated in the near future.
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Affiliation(s)
- Chryssostomos Chatgilialoglu
- Istituto per la Sintesi Organica e la Fotoreattività, Consiglio Nazionale delle Ricerche, 40129 Bologna, Italy
- Center of Advanced Technologies, Adam Mickiewicz University, 61-712 Poznan, Poland
| | - Sebastian Barata-Vallejo
- Istituto per la Sintesi Organica e la Fotoreattività, Consiglio Nazionale delle Ricerche, 40129 Bologna, Italy
- Facultad de Farmacia y Bioquímica, Departamento de Ciencias Químicas, Universidad de Buenos Aires, Junin 954, Buenos Aires CP 1113, Argentina
| | - Thanasis Gimisis
- Department of Chemistry, National and Kapodistrian University of Athens, 15771 Athens, Greece
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6
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Hai H, Qin S, Zhang Y, Liu W, Feng J, Guo H, Kühn FE, Liu Y. Visible Light-Induced Regioselective Intermolecular [2 + 2]-Cycloaddition of Alkyne and 2(1 H)-Quinolone Derivatives. J Org Chem 2024. [PMID: 38190649 DOI: 10.1021/acs.joc.3c02685] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2024]
Abstract
We have developed a visible light-induced intermolecular [2 + 2]-cycloaddition reaction between alkenes and alkynes using thioxanthone and Cu(OTf)2 as cocatalysts. Various quinolin-2(1H)-ones, featuring diverse substituted groups, were successfully employed in this reaction, resulting in the synthesis of a series of 4,8b-dihydrocyclobuta[c]quinolin-3(2aH)-ones. Our methodology presents a novel synthetic approach for alkene-alkyne [2 + 2]-cycloaddition, delivering cyclobutene derivatives with exceptional regioselectivity.
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Affiliation(s)
- Hao Hai
- Academy for Engineering and Technology, Fudan University, 220 Handan Road, Shanghai 200433, P. R. China
| | - Shaoheng Qin
- Molecular Catalysis, Department of Chemistry and Catalysis Research Center, School of Natural Sciences, Technical University Munich, Lichtenbergstr. 4, 85747 Garching bei München, Germany
| | - Yanzhi Zhang
- Department of Breast Surgery, Fudan University Shanghai Cancer Center/Cancer Institute, Shanghai 200032, P. R. China
- Department of Oncology, Shanghai Medical College, Fudan University, Shanghai 200032, P. R. China
| | - Wangsheng Liu
- Department of Chemistry, Fudan University, 2005 Songhu Road, Shanghai 200438, P. R. China
| | - Jin Feng
- Department of Chemistry, Fudan University, 2005 Songhu Road, Shanghai 200438, P. R. China
| | - Hao Guo
- Academy for Engineering and Technology, Fudan University, 220 Handan Road, Shanghai 200433, P. R. China
- Department of Chemistry, Fudan University, 2005 Songhu Road, Shanghai 200438, P. R. China
| | - Fritz E Kühn
- Molecular Catalysis, Department of Chemistry and Catalysis Research Center, School of Natural Sciences, Technical University Munich, Lichtenbergstr. 4, 85747 Garching bei München, Germany
| | - Yin Liu
- Department of Breast Surgery, Fudan University Shanghai Cancer Center/Cancer Institute, Shanghai 200032, P. R. China
- Department of Oncology, Shanghai Medical College, Fudan University, Shanghai 200032, P. R. China
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