1
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Ando H, Takamura H, Kadota I, Tanaka K. Strongly reducing helical phenothiazines as recyclable organophotoredox catalysts. Chem Commun (Camb) 2024; 60:4765-4768. [PMID: 38529587 DOI: 10.1039/d4cc00904e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/27/2024]
Abstract
Recyclable phenothiazine organophotoredox catalysts (PTHS 1-3, E1/2ox* = -2.34 to -2.40 V vs. SCE) have been developed. When the recycling performance was evaluated, PTHS-1 could be recovered at least four times without loss of its catalytic activity. These recyclable organophotoredox catalysts represent a promising tool for sustainable organic synthesis.
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Affiliation(s)
- Haru Ando
- Department of Chemistry, Graduate School of Natural Science and Technology, Okayama University, 3-1-1 Tsushima-Naka, Kitaku, Okayama 700-8530, Japan.
| | - Hiroyoshi Takamura
- Department of Chemistry, Graduate School of Natural Science and Technology, Okayama University, 3-1-1 Tsushima-Naka, Kitaku, Okayama 700-8530, Japan.
| | - Isao Kadota
- Department of Chemistry, Graduate School of Natural Science and Technology, Okayama University, 3-1-1 Tsushima-Naka, Kitaku, Okayama 700-8530, Japan.
| | - Kenta Tanaka
- Research Institute for Interdisciplinary Science, Okayama University, 3-1-1 Tsushima-Naka, Kitaku, Okayama 700-8530, Japan.
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2
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Oburn SM, Huss S, Cox J, Gerthoffer MC, Wu S, Biswas A, Murphy M, Crespi VH, Badding JV, Lopez SA, Elacqua E. Photochemically Mediated Polymerization of Molecular Furan and Pyridine: Synthesis of Nanothreads at Reduced Pressures. J Am Chem Soc 2022; 144:22026-22034. [PMID: 36417898 DOI: 10.1021/jacs.2c09204] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
Nanothreads are emerging one-dimensional sp3-hybridized materials with high predicted tensile strength and a tunable band gap. They can be synthesized by compressing aromatic or nonaromatic small molecules to pressures ranging from 15-30 GPa. Recently, new avenues are being sought that reduce the pressure required to afford nanothreads; the focus has been placed on the polymerization of molecules with reduced aromaticity, favorable stacking, and/or the use of higher reaction temperatures. Herein, we report the photochemically mediated polymerization of pyridine and furan aromatic precursors, which achieves nanothread formation at reduced pressures. In the case of pyridine, it was found that a combination of slow compression/decompression with broadband UV light exposure yielded a crystalline product featuring a six-fold diffraction pattern with similar interplanar spacings to previously synthesized pyridine-derived nanothreads at a reduced pressure. When furan is compressed to 8 GPa and exposed to broadband UV light, a crystalline solid is recovered that similarly demonstrates X-ray diffraction with an interplanar spacing akin to that of the high-pressure synthesized furan-derived nanothreads. Our method realizes a 1.9-fold reduction in the maximum pressure required to afford furan-derived nanothreads and a 1.4-fold reduction in pressure required for pyridine-derived nanothreads. Density functional theory and multiconfigurational wavefunction-based computations were used to understand the photochemical activation of furan and subsequent cascade thermal cycloadditions. The reduction of the onset pressure is caused by an initial [4+4] cycloaddition followed by increasingly facile thermal [4+2]-cycloadditions during polymerization.
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Affiliation(s)
- Shalisa M Oburn
- Department of Chemistry, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
| | - Steven Huss
- Department of Chemistry, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
| | - Jordan Cox
- Department of Chemistry and Chemical Biology, Northeastern University, Boston, Massachusetts 02115, United States
| | - Margaret C Gerthoffer
- Department of Chemistry, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
| | - Sikai Wu
- Department of Chemistry, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
| | - Arani Biswas
- Department of Chemistry, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
| | - Morgan Murphy
- Department of Chemistry, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
| | - Vincent H Crespi
- Department of Chemistry, The Pennsylvania State University, University Park, Pennsylvania 16802, United States.,Department of Physics, The Pennsylvania State University, University Park, Pennsylvania 16802, United States.,Materials Research Institute, The Pennsylvania State University, University Park, Pennsylvania 16802, United States.,Department of Materials Science and Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
| | - John V Badding
- Department of Chemistry, The Pennsylvania State University, University Park, Pennsylvania 16802, United States.,Department of Physics, The Pennsylvania State University, University Park, Pennsylvania 16802, United States.,Materials Research Institute, The Pennsylvania State University, University Park, Pennsylvania 16802, United States.,Department of Materials Science and Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
| | - Steven A Lopez
- Department of Chemistry and Chemical Biology, Northeastern University, Boston, Massachusetts 02115, United States
| | - Elizabeth Elacqua
- Department of Chemistry, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
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3
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Chua MH, Soo XYD, Goh WP, Png ZM, Zhu Q, Xu J. Thioxanthylium Cations: Highly Reversible Hydrochromic Mate‐rials with Tunable Color and Moisture Sensitivity. Chemistry 2022; 28:e202201975. [DOI: 10.1002/chem.202201975] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2022] [Indexed: 11/08/2022]
Affiliation(s)
- Ming Hui Chua
- Institute of Materials Research and Engineering (IMRE) Agency for Science Technology and Research 2 Fusionopolis Way Innovis, #08-03 138634 Singapore
- Institute of Sustainability for Chemicals Energy and Environment (ISCE2) Agency for Science Technology and Research 1 Pesek Road Jurong Island 627833 Singapore
| | - Xiang Yun Debbie Soo
- Institute of Materials Research and Engineering (IMRE) Agency for Science Technology and Research 2 Fusionopolis Way Innovis, #08-03 138634 Singapore
| | - Wei Peng Goh
- Institute of Materials Research and Engineering (IMRE) Agency for Science Technology and Research 2 Fusionopolis Way Innovis, #08-03 138634 Singapore
| | - Zhuang Mao Png
- Institute of Materials Research and Engineering (IMRE) Agency for Science Technology and Research 2 Fusionopolis Way Innovis, #08-03 138634 Singapore
- Institute of Sustainability for Chemicals Energy and Environment (ISCE2) Agency for Science Technology and Research 1 Pesek Road Jurong Island 627833 Singapore
| | - Qiang Zhu
- Institute of Materials Research and Engineering (IMRE) Agency for Science Technology and Research 2 Fusionopolis Way Innovis, #08-03 138634 Singapore
| | - Jianwei Xu
- Institute of Materials Research and Engineering (IMRE) Agency for Science Technology and Research 2 Fusionopolis Way Innovis, #08-03 138634 Singapore
- Institute of Sustainability for Chemicals Energy and Environment (ISCE2) Agency for Science Technology and Research 1 Pesek Road Jurong Island 627833 Singapore
- Department of Chemistry National University of Singapore 3 Science Drive 3 117543 Singapore Singapore
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4
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Tanaka K, Kishimoto M, Tanaka Y, Kamiyama Y, Asada Y, Sukekawa M, Ohtsuka N, Suzuki T, Momiyama N, Honda K, Hoshino Y. Moderately Oxidizing Thioxanthylium Organophotoredox Catalysts for Radical-Cation Diels-Alder Reactions. J Org Chem 2022; 87:3319-3328. [PMID: 35142514 DOI: 10.1021/acs.joc.1c02972] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Moderately oxidizing thioxanthylium photoredox catalysts that operate under irradiation with green light have been developed. These catalysts exhibit relatively moderate excited-state reduction potentials [E1/2(C*/C•-) = 1.75-1.94 V vs saturated calomel electrode (SCE)] and can efficiently promote radical-cation Diels-Alder reactions under irradiation with green light. Interestingly, β-halogenostyrenes (Ep/2 = 1.57-1.61 V vs SCE) are well tolerated, affording synthetically useful halocyclohexenes.
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Affiliation(s)
- Kenta Tanaka
- Graduate School of Environment and Information Sciences, Yokohama National University, Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Japan
| | - Mami Kishimoto
- Graduate School of Environment and Information Sciences, Yokohama National University, Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Japan
| | - Yuta Tanaka
- Graduate School of Environment and Information Sciences, Yokohama National University, Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Japan
| | - Yusuke Kamiyama
- Graduate School of Environment and Information Sciences, Yokohama National University, Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Japan
| | - Yosuke Asada
- Graduate School of Environment and Information Sciences, Yokohama National University, Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Japan
| | - Mayumi Sukekawa
- Graduate School of Environment and Information Sciences, Yokohama National University, Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Japan
| | - Naoya Ohtsuka
- Institute for Molecular Science, Okazaki, Aichi 444-8787, Japan.,SOKENDAI (The Graduate University for Advanced Studies), Okazaki, Aichi 444-8787, Japan
| | | | - Norie Momiyama
- Institute for Molecular Science, Okazaki, Aichi 444-8787, Japan.,SOKENDAI (The Graduate University for Advanced Studies), Okazaki, Aichi 444-8787, Japan
| | - Kiyoshi Honda
- Graduate School of Environment and Information Sciences, Yokohama National University, Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Japan
| | - Yujiro Hoshino
- Graduate School of Environment and Information Sciences, Yokohama National University, Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Japan
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5
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Tanaka K, Asada Y, Hoshino Y. A new cycloaddition profile for ortho-quinone methides: photoredox-catalyzed [6+4] cycloadditions for synthesis of benzo[ b]cyclopenta[ e]oxepines. Chem Commun (Camb) 2022; 58:2476-2479. [PMID: 35014637 DOI: 10.1039/d1cc06332d] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Visible-light-induced [6+4] cycloaddition reactions of ortho-quinone methides have been developed. The reaction of ortho-quinone methides with pentafulvenes in the presence of a thioxanthylium photoredox catalyst afforded benzo[b]cyclopenta[e]oxepines. The present reaction represents a promising tool for the synthesis of natural products and bioactive compounds that contain a benzoxepine structure.
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Affiliation(s)
- Kenta Tanaka
- Graduate School of Environment and Information Sciences, Yokohama National University, Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Japan.
| | - Yosuke Asada
- Graduate School of Environment and Information Sciences, Yokohama National University, Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Japan.
| | - Yujiro Hoshino
- Graduate School of Environment and Information Sciences, Yokohama National University, Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Japan.
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6
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Mao Z, Huang A, Ma L, Zhang M. Visible light enabled [4+2] annulation reactions for anthracenone-furans from 2,3-dibromonaphthoquinone and phenylbenzofurans. RSC Adv 2021; 11:38235-38238. [PMID: 35498062 PMCID: PMC9044024 DOI: 10.1039/d1ra07314a] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2021] [Accepted: 11/18/2021] [Indexed: 12/20/2022] Open
Abstract
A facile visible light promoted approach to anthracenone-furans from readily available 2,3-dibromonaphthoquinones and phenylbenzofurans via a formal Diels Alder reaction is reported. This reaction involves wavelength-selective agitation of 4CzIPN, energy transfer to quinones, recombination of 1,6-biradicals and elimination to give anthracenone-furans in good to excellent yields in one pot.
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Affiliation(s)
- Zhimei Mao
- School of Chemistry and Chemical Engineering, Guangxi University Nanning Guangxi 530004 China
| | - Aimin Huang
- School of Chemistry and Chemical Engineering, Guangxi University Nanning Guangxi 530004 China
| | - Lin Ma
- School of Chemistry and Chemical Engineering, Guangxi University Nanning Guangxi 530004 China
| | - Min Zhang
- School of Chemistry and Chemical Engineering, Guangxi University Nanning Guangxi 530004 China
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7
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Sicignano M, Rodríguez RI, Alemán J. Recent Visible Light and Metal Free Strategies in [2+2] and [4+2] Photocycloadditions. European J Org Chem 2021; 2021:3303-3321. [PMID: 34248414 PMCID: PMC8252406 DOI: 10.1002/ejoc.202100518] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2021] [Revised: 05/17/2021] [Indexed: 01/17/2023]
Abstract
When aiming to synthesize molecules with elevated molecular complexity starting from relatively simple starting materials, photochemical transformations represent an open avenue to circumvent analogous multistep procedures. Specifically, light-mediated cycloadditions remain as powerful tools to generate new bonds begotten from non-very intuitive disconnections, that alternative thermal protocols would not offer. In response to the current trend in both industrial and academic research pointing towards green and sustainable processes, several strategies that meet these requirements are currently available in the literature. This Minireview summarizes [2+2] and [4+2] photocycloadditions that do not require the use of metal photocatalysts by means of alternative strategies. It is segmented according to the cycloaddition type in order to give the reader a friendly approach and we primarily focus on the most recent developments in the field carried out using visible light, a general overview of the mechanism in each case is offered as well.
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Affiliation(s)
- Marina Sicignano
- Organic Chemistry DepartmentMódulo 1Universidad Autónoma de Madrid28049MadridSpain
| | - Ricardo I. Rodríguez
- Organic Chemistry DepartmentMódulo 1Universidad Autónoma de Madrid28049MadridSpain
| | - José Alemán
- Organic Chemistry DepartmentMódulo 1Universidad Autónoma de Madrid28049MadridSpain
- Institute for Advanced Research in Chemical Sciences (IAdChem)Universidad Autónoma de Madrid28049MadridSpain
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8
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Organocatalytic Enantioselective Cycloaddition of
o
‐Quinone Methides with Oxazolones: Asymmetric Synthesis of Dihydrocoumarins. ChemistrySelect 2020. [DOI: 10.1002/slct.202003817] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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9
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Chen Y, Ni N, Cheng D, Xu X. The coupling of alkylboronic acids with α-(trifluoromethyl)styrenes by Lewis base/photoredox dual catalysis. Tetrahedron Lett 2020. [DOI: 10.1016/j.tetlet.2020.152425] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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10
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Tanaka K, Iwama Y, Kishimoto M, Ohtsuka N, Hoshino Y, Honda K. Redox Potential Controlled Selective Oxidation of Styrenes for Regio- and Stereoselective Crossed Intermolecular [2 + 2] Cycloaddition via Organophotoredox Catalysis. Org Lett 2020; 22:5207-5211. [PMID: 32525321 DOI: 10.1021/acs.orglett.0c01852] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A redox potential controlled intermolecular [2 + 2] cross-cycloaddition has been developed in the presence of a thioxanthylium photoredox catalyst. Electron-rich styrenes such as β-bromostyrene (Ep/2 = +1.61 V vs SCE) were selectively oxidized by a thioxanthylium photoredox catalyst (E1/2 (C*/C•-) = +1.76 V vs SCE) to styryl radical cations and reacted with styrene (Ep/2 = +1.97 V vs SCE) to furnish polysubstituted cyclobutanes in high yields. The present reaction can be successfully applied to intermolecular [2 + 2] cross-cycloaddition of β-halogenostyrenes, which cannot be effectively achieved by the hitherto reported representative organophotoredox catalysts.
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Affiliation(s)
- Kenta Tanaka
- Faculty of Pharmaceutical Sciences, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japan
| | - Yoshinori Iwama
- Graduate School of Environment and Information Sciences, Yokohama National University, Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Japan
| | - Mami Kishimoto
- Graduate School of Environment and Information Sciences, Yokohama National University, Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Japan
| | - Naoya Ohtsuka
- Institute for Molecular Science, Okazaki, Aichi 444-8787, Japan.,SOKENDAI, Okazaki, Aichi 444-8787, Japan
| | - Yujiro Hoshino
- Graduate School of Environment and Information Sciences, Yokohama National University, Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Japan
| | - Kiyoshi Honda
- Graduate School of Environment and Information Sciences, Yokohama National University, Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Japan
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11
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Tang Q, He X, Zhang J, Zhou T, Xie M, Li R, Zuo Y, Shang Y. Selective synthesis of 2‐(5‐oxo‐1‐arylhex‐1‐yn‐3‐yl)phenyl benzoates via FeCl
3
‐mediated cascade reactions of propargylamines with
β
‐enamino ketones. Appl Organomet Chem 2020. [DOI: 10.1002/aoc.5676] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Qiang Tang
- Key Laboratory of Functional Molecular Solids, Ministry of Education, Anhui Laboratory of Molecule‐Based Materials (State Key Laboratory Cultivation Base), College of Chemistry and Materials Science Anhui Normal University Wuhu 241002 People's Republic of China
| | - Xinwei He
- Key Laboratory of Functional Molecular Solids, Ministry of Education, Anhui Laboratory of Molecule‐Based Materials (State Key Laboratory Cultivation Base), College of Chemistry and Materials Science Anhui Normal University Wuhu 241002 People's Republic of China
| | - Jinxue Zhang
- Key Laboratory of Functional Molecular Solids, Ministry of Education, Anhui Laboratory of Molecule‐Based Materials (State Key Laboratory Cultivation Base), College of Chemistry and Materials Science Anhui Normal University Wuhu 241002 People's Republic of China
| | - Tongtong Zhou
- Key Laboratory of Functional Molecular Solids, Ministry of Education, Anhui Laboratory of Molecule‐Based Materials (State Key Laboratory Cultivation Base), College of Chemistry and Materials Science Anhui Normal University Wuhu 241002 People's Republic of China
| | - Mengqing Xie
- Key Laboratory of Functional Molecular Solids, Ministry of Education, Anhui Laboratory of Molecule‐Based Materials (State Key Laboratory Cultivation Base), College of Chemistry and Materials Science Anhui Normal University Wuhu 241002 People's Republic of China
| | - Ruxue Li
- Key Laboratory of Functional Molecular Solids, Ministry of Education, Anhui Laboratory of Molecule‐Based Materials (State Key Laboratory Cultivation Base), College of Chemistry and Materials Science Anhui Normal University Wuhu 241002 People's Republic of China
| | - Youpeng Zuo
- Key Laboratory of Functional Molecular Solids, Ministry of Education, Anhui Laboratory of Molecule‐Based Materials (State Key Laboratory Cultivation Base), College of Chemistry and Materials Science Anhui Normal University Wuhu 241002 People's Republic of China
| | - Yongjia Shang
- Key Laboratory of Functional Molecular Solids, Ministry of Education, Anhui Laboratory of Molecule‐Based Materials (State Key Laboratory Cultivation Base), College of Chemistry and Materials Science Anhui Normal University Wuhu 241002 People's Republic of China
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12
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Horibe T, Ohmura S, Katagiri K, Ishihara K. Cationic Iron(III) Salt as an Initiator for Radical Cation‐induced [4+2] Cycloaddition. ASIAN J ORG CHEM 2020. [DOI: 10.1002/ajoc.201900749] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Takahiro Horibe
- Graduate School of EngineeringNagoya University Furo-cho, Chikusa Nagoya 464-8603 Japan
| | - Shuhei Ohmura
- Graduate School of EngineeringNagoya University Furo-cho, Chikusa Nagoya 464-8603 Japan
| | - Kei Katagiri
- Graduate School of EngineeringNagoya University Furo-cho, Chikusa Nagoya 464-8603 Japan
| | - Kazuaki Ishihara
- Graduate School of EngineeringNagoya University Furo-cho, Chikusa Nagoya 464-8603 Japan
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13
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Abstract
Total synthesis of caesalpinnone A was achieved in 12 steps starting from resorcinol. Key features of the synthesis include BINOL-phosphoric acid catalyzed [4 + 2] cycloaddition, trans-selective nucleophilic substitution, deallylation/oxa-Michael addition cascade, and late-stage photo-Fries rearrangement.
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Affiliation(s)
- Zhigang Liu
- Shaanxi Key Laboratory of Natural Products and Chemical Biology, College of Chemistry and Pharmacy , Northwest A&F University , 3 Taicheng Road , Yangling 712100 , Shaanxi , P. R. China
| | - Yifei Meng
- Shaanxi Key Laboratory of Natural Products and Chemical Biology, College of Chemistry and Pharmacy , Northwest A&F University , 3 Taicheng Road , Yangling 712100 , Shaanxi , P. R. China
| | - Pengrui Yuan
- Shaanxi Key Laboratory of Natural Products and Chemical Biology, College of Chemistry and Pharmacy , Northwest A&F University , 3 Taicheng Road , Yangling 712100 , Shaanxi , P. R. China
| | - Zhengshen Wang
- Shaanxi Key Laboratory of Natural Products and Chemical Biology, College of Chemistry and Pharmacy , Northwest A&F University , 3 Taicheng Road , Yangling 712100 , Shaanxi , P. R. China
| | - Jin-Ming Gao
- Shaanxi Key Laboratory of Natural Products and Chemical Biology, College of Chemistry and Pharmacy , Northwest A&F University , 3 Taicheng Road , Yangling 712100 , Shaanxi , P. R. China
| | - Huaiji Zheng
- Shaanxi Key Laboratory of Natural Products and Chemical Biology, College of Chemistry and Pharmacy , Northwest A&F University , 3 Taicheng Road , Yangling 712100 , Shaanxi , P. R. China
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14
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Tanaka K, Asada Y, Hoshino Y, Honda K. Visible-light-induced [4 + 2] cycloaddition of pentafulvenes by organic photoredox catalysis. Org Biomol Chem 2020; 18:8074-8078. [PMID: 32789391 DOI: 10.1039/d0ob01151g] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
We have developed thioxanthylium photoredox catalyzed [4 + 2] cycloaddition of pentafulvenes at room temperature under green light irradiation, which affords tetrahydrocyclopenta[b]chromenes with high regioselectivities. The present reaction provides a sustainable approach to carry out the cycloaddition of pentafulvenes without the use of transition metal catalysts or high-temperature conditions. This procedure enables a mild and straightforward access to 1,3a,9,9a-tetrahydrocyclopenta[b]chromenes. The quantum yield of the reaction (Φ = 0.15) indicates that the reaction would mainly proceed via photocatalytic pathways.
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Affiliation(s)
- Kenta Tanaka
- Faculty of Pharmaceutical Science, Tokyo University of Science, 2641 Yamazaki, Noda-city, Chiba 278-8510, Japan.
| | - Yosuke Asada
- Graduate School of Environment and Information Sciences, Yokohama National University, Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Japan.
| | - Yujiro Hoshino
- Graduate School of Environment and Information Sciences, Yokohama National University, Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Japan.
| | - Kiyoshi Honda
- Graduate School of Environment and Information Sciences, Yokohama National University, Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Japan.
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15
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Xia C, Wang DC, Qu GR, Guo HM. Palladium-catalyzed enantioselective [5 + 4] annulation of ortho-quinone methides and vinylethylene carbonates. Org Chem Front 2020. [DOI: 10.1039/d0qo00128g] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Highly enantioselective [5 + 4] annulations of ortho-quinone methides with vinylethylene carbonates are enabled by asymmetric palladium catalysis for the synthesis of chiral nine-membered benzo-heterocycles.
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Affiliation(s)
- Chao Xia
- School of Environment
- Henan Normal University
- Xinxiang
- China
| | - Dong-Chao Wang
- Henan Key Laboratory of Organic Functional Molecules and Drugs Innovation
- Key Laboratory of Green Chemical Media and Reactions
- Ministry of Education
- Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals
- School of Chemistry and Chemical Engineering
| | - Gui-Rong Qu
- Henan Key Laboratory of Organic Functional Molecules and Drugs Innovation
- Key Laboratory of Green Chemical Media and Reactions
- Ministry of Education
- Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals
- School of Chemistry and Chemical Engineering
| | - Hai-Ming Guo
- School of Environment
- Henan Normal University
- Xinxiang
- China
- Henan Key Laboratory of Organic Functional Molecules and Drugs Innovation
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16
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Tanaka K, Kishimoto M, Asada Y, Tanaka Y, Hoshino Y, Honda K. Access to Electron-Deficient 2,2-Disubstituted Chromanes: A Highly Regioselective One-Pot Synthesis via an Inverse-Electron-Demand [4 + 2] Cycloaddition of ortho-Quinone Methides. J Org Chem 2019; 84:13858-13870. [PMID: 31580068 DOI: 10.1021/acs.joc.9b02036] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
We report the one-pot synthesis of 2,2-disubstituted chromanes with electron-withdrawing substituents. This reaction provides a simple yet efficient route to a wide range of electron-deficient chromanes in high yield and excellent regioselectivity. The reaction of salicylaldehyde with 1,1-disubstituted ethylenes smoothly furnishes these electron-deficient chromanes, which can be further transformed into functionalized chromanes or chromene. For example, BW683C was effectively synthesized from 5-chlorosalicylaldehyde with 4-chlorostyrene in two steps in excellent yield. The present reaction thus provides versatile access to functionalized electron-deficient chromanes and chromenes and therefore constitutes a promising tool for the synthesis of biologically and photochemically active molecules.
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Affiliation(s)
- Kenta Tanaka
- Graduate School of Environment and Information Sciences , Yokohama National University , Tokiwadai, Hodogaya-ku, Yokohama 240-8501 , Japan
| | - Mami Kishimoto
- Graduate School of Environment and Information Sciences , Yokohama National University , Tokiwadai, Hodogaya-ku, Yokohama 240-8501 , Japan
| | - Yosuke Asada
- Graduate School of Environment and Information Sciences , Yokohama National University , Tokiwadai, Hodogaya-ku, Yokohama 240-8501 , Japan
| | - Yuta Tanaka
- Graduate School of Environment and Information Sciences , Yokohama National University , Tokiwadai, Hodogaya-ku, Yokohama 240-8501 , Japan
| | - Yujiro Hoshino
- Graduate School of Environment and Information Sciences , Yokohama National University , Tokiwadai, Hodogaya-ku, Yokohama 240-8501 , Japan
| | - Kiyoshi Honda
- Graduate School of Environment and Information Sciences , Yokohama National University , Tokiwadai, Hodogaya-ku, Yokohama 240-8501 , Japan
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17
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Tanaka K, Tanaka Y, Kishimoto M, Hoshino Y, Honda K. Friedel-Crafts approach to the one-pot synthesis of methoxy-substituted thioxanthylium salts. Beilstein J Org Chem 2019; 15:2105-2112. [PMID: 31579074 PMCID: PMC6753671 DOI: 10.3762/bjoc.15.208] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2019] [Accepted: 08/20/2019] [Indexed: 02/05/2023] Open
Abstract
An efficient synthesis of methoxy-substituted thioxanthylium salts has been developed. The reaction of diaryl sulfides with benzoyl chlorides in the presence of TfOH smoothly proceeded to give the desired thioxanthylium salts in good yields. In their UV–vis spectra, the maximum absorption wavelengths of methoxy-functionalized thioxanthylium salts were observed at around 460 nm, which show a drastic red shift compared to the parent thioxanthylium salts. The present reaction provides a versatile access to functionalized thioxanthylium salts, and therefore it constitutes a promising tool for the synthesis of biologically and photochemically active molecules.
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Affiliation(s)
- Kenta Tanaka
- Graduate School of Environment and Information Sciences, Yokohama National University, Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Japan
| | - Yuta Tanaka
- Graduate School of Environment and Information Sciences, Yokohama National University, Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Japan
| | - Mami Kishimoto
- Graduate School of Environment and Information Sciences, Yokohama National University, Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Japan
| | - Yujiro Hoshino
- Graduate School of Environment and Information Sciences, Yokohama National University, Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Japan
| | - Kiyoshi Honda
- Graduate School of Environment and Information Sciences, Yokohama National University, Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Japan
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18
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Meng FX, Wang RN, Huang HL, Gong SW, Li QL, Zhang SL, Ma CL, Li CZ, Du JY. Lewis acid-catalyzed tandem cyclization of in situ generated o-quinone methides and arylsulfonyl hydrazides for a one-pot entry to 3-sulfonylbenzofurans. Org Chem Front 2019. [DOI: 10.1039/c9qo01196j] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Lewis acid-mediated one-pot tandem cyclization of o-QMs with arylsulfonyl hydrazides was described for the first time and the corresponding 3-sulfonylbenzofuran products were obtained in moderate to good yields.
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Affiliation(s)
- Fan-Xiao Meng
- College of Chemistry and Chemical Engineering
- Liaocheng University
- Liaocheng
- China
| | - Ruo-Nan Wang
- College of Chemistry and Chemical Engineering
- Liaocheng University
- Liaocheng
- China
| | - Hong-Li Huang
- College of Chemistry and Chemical Engineering
- Liaocheng University
- Liaocheng
- China
| | - Shu-Wen Gong
- College of Chemistry and Chemical Engineering
- Liaocheng University
- Liaocheng
- China
| | - Qian-Li Li
- College of Chemistry and Chemical Engineering
- Liaocheng University
- Liaocheng
- China
| | - Shao-Liang Zhang
- College of Chemistry and Chemical Engineering
- Liaocheng University
- Liaocheng
- China
| | - Chun-Lin Ma
- College of Chemistry and Chemical Engineering
- Liaocheng University
- Liaocheng
- China
| | - Chen-Zhong Li
- Nanobioengineering/Bioelectronics Laboratory
- Department of Biomedical Engineering
- Florida International University
- Miami
- USA
| | - Ji-Yuan Du
- College of Chemistry and Chemical Engineering
- Liaocheng University
- Liaocheng
- China
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