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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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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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Nagahora N, Hirano K, Yasuda A, Sasamori T, Shioji K, Okuma K. The Electronic Structure of Thioxanthylium Scaffolds. HETEROCYCLES 2021. [DOI: 10.3987/com-20-14372] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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Nagahora N, Tanaka R, Tada T, Yasuda A, Yamada Y, Shioji K, Okuma K. Thiopyrylium Scaffolds from the Lewis/Brønsted-Acid-Promoted Cyclization of Thioethers. Org Lett 2020; 22:6192-6196. [DOI: 10.1021/acs.orglett.0c02292] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Noriyoshi Nagahora
- Department of Chemistry, Faculty of Science, Fukuoka University, Jonan-ku, Fukuoka 814-0180, Japan
| | - Rina Tanaka
- Department of Chemistry, Faculty of Science, Fukuoka University, Jonan-ku, Fukuoka 814-0180, Japan
| | - Tomoyo Tada
- Department of Chemistry, Faculty of Science, Fukuoka University, Jonan-ku, Fukuoka 814-0180, Japan
| | - Akira Yasuda
- Department of Chemistry, Faculty of Science, Fukuoka University, Jonan-ku, Fukuoka 814-0180, Japan
| | - Yuji Yamada
- Department of Chemistry, Faculty of Science, Fukuoka University, Jonan-ku, Fukuoka 814-0180, Japan
| | - Kosei Shioji
- Department of Chemistry, Faculty of Science, Fukuoka University, Jonan-ku, Fukuoka 814-0180, Japan
| | - Kentaro Okuma
- Department of Chemistry, Faculty of Science, Fukuoka University, Jonan-ku, Fukuoka 814-0180, Japan
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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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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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