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Yamaguchi H, Takahashi F, Kurogi T, Yorimitsu H. Reductive anti-Dizincation of Arylacetylenes. Chem Asian J 2024; 19:e202400384. [PMID: 38647096 DOI: 10.1002/asia.202400384] [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: 04/05/2024] [Revised: 04/22/2024] [Accepted: 04/22/2024] [Indexed: 04/25/2024]
Abstract
Arylacetylenes undergo anti-1,2-dizincation to afford trans-1,2-dizincioalkenes. The process employs sodium dispersion as a reducing agent and zinc chloride TMEDA complex as a reduction-resistant zinc electrophile. This reductive anti-dizincation contrasts with the conventional additive syn-dimetalation like silylzincation. The resulting dizincated alkenes undergo the cross-coupling to yield multi-substituted alkenes stereoselectively.
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Affiliation(s)
- Haruka Yamaguchi
- Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto, 606-8502, Japan
| | - Fumiya Takahashi
- Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto, 606-8502, Japan
| | - Takashi Kurogi
- Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto, 606-8502, Japan
| | - Hideki Yorimitsu
- Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto, 606-8502, Japan
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2
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Wang S, Kaga A, Kurogi T, Yorimitsu H. Reductive Ring Opening of Arylcyclopropanecarboxamides Accompanied by Borylation and Enolate Formation. Org Lett 2022; 24:1105-1109. [PMID: 35076241 DOI: 10.1021/acs.orglett.2c00084] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Treatment of arylcyclopropanecarboxamides with a sodium dispersion in the presence of methoxypinacolborane as a reduction-resistant electrophile leads to reductive cleavage of the cyclopropane ring followed by instant trapping with the boron electrophile to yield the enolates of γ-aryl-γ-borylalkanamides. The enolates react further with a different electrophile to yield the corresponding α-substituted amides with anti selectivity.
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Affiliation(s)
- Shuo Wang
- Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan
| | - Atsushi Kaga
- Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan
| | - Takashi Kurogi
- Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan
| | - Hideki Yorimitsu
- Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan
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3
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Miwa K, Aoyagi S, Sasamori T, Morisako S, Ueno H, Matsuo Y, Yorimitsu H. Facile Multiple Alkylations of C 60 Fullerene. MOLECULES (BASEL, SWITZERLAND) 2022; 27:molecules27020450. [PMID: 35056764 PMCID: PMC8779915 DOI: 10.3390/molecules27020450] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/11/2021] [Revised: 12/30/2021] [Accepted: 01/06/2022] [Indexed: 11/24/2022]
Abstract
The reduction of fullerene (C60) with sodium dispersion in the presence of an excess amount of dipropyl sulfate was found to yield highly propylated fullerene, C60(nC3H7)n (max. n = 24), and C60(nC3H7)20 was predominantly generated as determined by mass spectroscopy.
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Affiliation(s)
- Kazuhira Miwa
- Department of Information and Basic Science, Graduate School of Science, Nagoya City University, Nagoya 467-8501, Aichi, Japan; (K.M.); (S.M.)
| | - Shinobu Aoyagi
- Department of Information and Basic Science, Graduate School of Science, Nagoya City University, Nagoya 467-8501, Aichi, Japan; (K.M.); (S.M.)
- Correspondence: (S.A.); (T.S.); Tel.: +81-52-872-5061 (S.A.); +81-29-853-4412 (T.S.)
| | - Takahiro Sasamori
- Department of Information and Basic Science, Graduate School of Science, Nagoya City University, Nagoya 467-8501, Aichi, Japan; (K.M.); (S.M.)
- Tsukuba Research Center for Energy Materials Sciences (TREMS), Division of Chemistry, Faculty of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba 305-8571, Ibaraki, Japan
- Correspondence: (S.A.); (T.S.); Tel.: +81-52-872-5061 (S.A.); +81-29-853-4412 (T.S.)
| | - Shogo Morisako
- Department of Information and Basic Science, Graduate School of Science, Nagoya City University, Nagoya 467-8501, Aichi, Japan; (K.M.); (S.M.)
- Tsukuba Research Center for Energy Materials Sciences (TREMS), Division of Chemistry, Faculty of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba 305-8571, Ibaraki, Japan
| | - Hiroshi Ueno
- Creative Interdisciplinary Research Division, Frontier Research Institute for Interdisciplinary Sciences and Department of Chemistry, Graduate School of Science, Tohoku University, Sendai 980-8578, Miyagi, Japan;
| | - Yutaka Matsuo
- Department of Chemical System Engineering, Graduate School of Engineering, Nagoya University, Nagoya 464-8603, Aichi, Japan;
- Department of Mechanical Engineering, School of Engineering, The University of Tokyo, Tokyo 113-8656, Japan
| | - Hideki Yorimitsu
- Department of Chemistry, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan;
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Asako S, Takahashi I, Kurogi T, Murakami Y, Ilies L, Takai K. Birch Reduction of Arenes Using Sodium Dispersion and DMI under Mild Conditions. CHEM LETT 2022. [DOI: 10.1246/cl.210546] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Sobi Asako
- Division of Applied Chemistry, Graduate School of Natural Science and Technology, Okayama University, 3-1-1 Tsushimanaka, Kita-ku, Okayama 700-8530, Japan
- RIKEN Center for Sustainable Resource Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - Ikko Takahashi
- RIKEN Center for Sustainable Resource Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - Takashi Kurogi
- Division of Applied Chemistry, Graduate School of Natural Science and Technology, Okayama University, 3-1-1 Tsushimanaka, Kita-ku, Okayama 700-8530, Japan
| | - Yoshiaki Murakami
- KOBELCO ECO-Solutions Co., Ltd., 4-78-1 Wakinohama-cho, Chuo-ku, Kobe 651-0072, Japan
| | - Laurean Ilies
- RIKEN Center for Sustainable Resource Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - Kazuhiko Takai
- Division of Applied Chemistry, Graduate School of Natural Science and Technology, Okayama University, 3-1-1 Tsushimanaka, Kita-ku, Okayama 700-8530, Japan
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Fukazawa M, Takahashi F, Yorimitsu H. Sodium-Promoted Borylation of Polycyclic Aromatic Hydrocarbons. Org Lett 2021; 23:4613-4617. [PMID: 34076437 DOI: 10.1021/acs.orglett.1c01355] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
Sodium dispersion promotes the reductive borylation of polycyclic aromatic hydrocarbons (PAHs) with MeOBpin. Anthracenes and phenanthrenes are converted to the corresponding dearomatized diborylated products. The reductive diborylation of naphthalene-based small π-systems yields similar yet unstable products that are oxidized into formal C-H borylation products with unique regioselectivity. Pyrene is converted to 1-borylpyrene without the addition of an oxidant. The latter two reactions represent a new route to useful borylated PAHs that rivals C-X borylation and catalytic C-H borylation.
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Affiliation(s)
- Mizuki Fukazawa
- Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan
| | - Fumiya Takahashi
- Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan
| | - Hideki Yorimitsu
- Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan
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