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Zhang T, Xie C, Sakata H, Nakajima K, Shimoyama T, Watanabe T, Maekawa H. A Simple Protocol from Benzalacetones to 1,1,1-Trifluoro-2,5-diketones and 2-(Trifluoromethyl)furans by Reductive Trifluoroacetylation. European J Org Chem 2020. [DOI: 10.1002/ejoc.202000160] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Tianyuan Zhang
- Department of Materials Science and Technology; Nagaoka University of Technology; 1603-1, Kamitomioka-cho 940-2188 Nagaoka Niigata Japan
| | - Chunchao Xie
- Department of Materials Science and Technology; Nagaoka University of Technology; 1603-1, Kamitomioka-cho 940-2188 Nagaoka Niigata Japan
| | - Hiroto Sakata
- Department of Materials Science and Technology; Nagaoka University of Technology; 1603-1, Kamitomioka-cho 940-2188 Nagaoka Niigata Japan
| | - Konomi Nakajima
- Department of Materials Science and Technology; Nagaoka University of Technology; 1603-1, Kamitomioka-cho 940-2188 Nagaoka Niigata Japan
| | - Tatsuya Shimoyama
- Department of Materials Science and Technology; Nagaoka University of Technology; 1603-1, Kamitomioka-cho 940-2188 Nagaoka Niigata Japan
| | - Tomohiro Watanabe
- Department of Materials Science and Technology; Nagaoka University of Technology; 1603-1, Kamitomioka-cho 940-2188 Nagaoka Niigata Japan
| | - Hirofumi Maekawa
- Department of Materials Science and Technology; Nagaoka University of Technology; 1603-1, Kamitomioka-cho 940-2188 Nagaoka Niigata Japan
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2
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Fukazawa M, Takahashi F, Nogi K, Sasamori T, Yorimitsu H. Reductive Difunctionalization of Aryl Alkenes with Sodium Metal and Reduction-Resistant Alkoxy-Substituted Electrophiles. Org Lett 2020; 22:2303-2307. [DOI: 10.1021/acs.orglett.0c00490] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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
| | - Keisuke Nogi
- Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan
| | - Takahiro Sasamori
- Graduate School of Natural Sciences, Nagoya City University, Yamanohata 1, Mizuho-cho, Mizuho-ku, Nagoya, Aichi 467-8501, 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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Zhang T, Shimizu Y, Fukaya S, Sawa T, Maekawa H. Construction of a CF 3-Containing Benzofurofuranone Skeleton from Coumarins via Reductive Coupling and Acid-Mediated Ring Contraction. J Org Chem 2019; 84:12165-12171. [PMID: 31487178 DOI: 10.1021/acs.joc.9b01439] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Magnesium-promoted reductive introduction of a trifluoroacetyl group to coumarin in the presence of ethyl trifluoroacetate and the subsequent treatment with trifluoroacetic acid led to simple access to a trifluoromethylated benzofurofuranone at 8a-position with a high regio- and stereoselectivity. Trifluoromethylated or difluoromethylated benzofurofuranone derivatives were also prepared from coumarins including naturally occurring ones only in two successive steps, which might have potential bioactivity in medicinal chemistry.
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Affiliation(s)
- Tianyuan Zhang
- Department of Materials Science and Technology , Nagaoka University of Technology , 1603-1, Kamitomioka-cho, Nagaoka, Niigata 940-2188 , Japan
| | - Yuhei Shimizu
- Department of Materials Science and Technology , Nagaoka University of Technology , 1603-1, Kamitomioka-cho, Nagaoka, Niigata 940-2188 , Japan
| | - Shuhei Fukaya
- Department of Materials Science and Technology , Nagaoka University of Technology , 1603-1, Kamitomioka-cho, Nagaoka, Niigata 940-2188 , Japan
| | - Tomofumi Sawa
- Department of Materials Science and Technology , Nagaoka University of Technology , 1603-1, Kamitomioka-cho, Nagaoka, Niigata 940-2188 , Japan
| | - Hirofumi Maekawa
- Department of Materials Science and Technology , Nagaoka University of Technology , 1603-1, Kamitomioka-cho, Nagaoka, Niigata 940-2188 , Japan
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4
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Zhang T, Shimizu Y, Shimizu K, Abe M, Zheng S, Maekawa H. Selective Introduction of Trifluoroacetyl Group to β- and δ-Position of Aromatic Conjugated Esters: Facile Synthesis of Fluorine-containing Keto Esters. ASIAN J ORG CHEM 2019. [DOI: 10.1002/ajoc.201800741] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Tianyuan Zhang
- Department of Materials Science and Technology; Nagaoka University of Technology, 1603-1, Kamitomioka-cho, Nagaoka; Niigata 940-2188 Japan
| | - Yuhei Shimizu
- Department of Materials Science and Technology; Nagaoka University of Technology, 1603-1, Kamitomioka-cho, Nagaoka; Niigata 940-2188 Japan
| | - Kazuyuki Shimizu
- Department of Materials Science and Technology; Nagaoka University of Technology, 1603-1, Kamitomioka-cho, Nagaoka; Niigata 940-2188 Japan
| | - Mitsuhiro Abe
- Department of Materials Science and Technology; Nagaoka University of Technology, 1603-1, Kamitomioka-cho, Nagaoka; Niigata 940-2188 Japan
| | - Suhua Zheng
- Department of Materials Science and Technology; Nagaoka University of Technology, 1603-1, Kamitomioka-cho, Nagaoka; Niigata 940-2188 Japan
| | - Hirofumi Maekawa
- Department of Materials Science and Technology; Nagaoka University of Technology, 1603-1, Kamitomioka-cho, Nagaoka; Niigata 940-2188 Japan
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5
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Medved'ko AV, Dalinger AI, Nuriev VN, Semashko VS, Filatov AV, Ezhov AA, Churakov AV, Howard JAK, Shiryaev AA, Baranchikov AE, Ivanov VK, Vatsadze SZ. Supramolecular Organogels Based on N-Benzyl, N'-Acylbispidinols. NANOMATERIALS (BASEL, SWITZERLAND) 2019; 9:E89. [PMID: 30641896 PMCID: PMC6359647 DOI: 10.3390/nano9010089] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/10/2018] [Revised: 12/24/2018] [Accepted: 01/03/2019] [Indexed: 12/12/2022]
Abstract
The acylation of unsymmetrical N-benzylbispidinols in aromatic solvents without an external base led to the formation of supramolecular gels, which possess different thicknesses and degrees of stability depending on the substituents in para-positions of the benzylic group as well as on the nature of the acylating agent and of the solvent used. Structural features of the native gels as well as of their dried forms were studied by complementary techniques including Fourier-transform infrared (FTIR) and attenuated total reflection (ATR) spectroscopy, atomic force microscopy (AFM), transmission electron microscopy (TEM), scanning electron microscopy (SEM), and small-angle X-ray scattering and diffraction (SAXS). Structures of the key crystalline compounds were established by X-ray diffraction. An analysis of the obtained data allowed speculation on the crucial structural and condition factors that governed the gel formation. The most important factors were as follows: (i) absence of base, either external or internal; (ii) presence of HCl; (iii) presence of carbonyl and hydroxyl groups to allow hydrogen bonding; and (iv) presence of two (hetero)aromatic rings at both sides of the molecule. The hydrogen bonding involving amide carbonyl, hydroxyl at position 9, and, very probably, ammonium N-H⁺ and Cl- anion appears to be responsible for the formation of infinite molecular chains required for the first step of gel formation. Subsequent lateral cooperation of molecular chains into fibers occurred, presumably, due to the aromatic π-π-stacking interactions. Supercritical carbon dioxide drying of the organogels gave rise to aerogels with morphologies different from that of air-dried samples.
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Affiliation(s)
- Alexey V Medved'ko
- Faculty of Chemistry, Lomonosov Moscow State University, 119991 Moscow, Russia.
| | | | - Vyacheslav N Nuriev
- Faculty of Chemistry, Lomonosov Moscow State University, 119991 Moscow, Russia.
| | - Vera S Semashko
- Faculty of Chemistry, Lomonosov Moscow State University, 119991 Moscow, Russia.
| | - Andrei V Filatov
- Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, 119991 Moscow, Russia.
| | - Alexander A Ezhov
- Faculty of Physics, Lomonosov Moscow State University, 119991 Moscow, Russia.
- Topchiev Institute of Petrochemical Synthesis, Russian Academy of Sciences, 119991 Moscow, Russia.
| | - Andrei V Churakov
- Kurnakov Institute of General and Inorganic Chemistry of the Russian Academy of Sciences, 119991 Moscow, Russia.
| | | | - Andrey A Shiryaev
- Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, 119071 Moscow, Russia.
- Institute of Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry, Russian Academy of Sciences, 119017 Moscow, Russia.
| | - Alexander E Baranchikov
- Faculty of Chemistry, Lomonosov Moscow State University, 119991 Moscow, Russia.
- Kurnakov Institute of General and Inorganic Chemistry of the Russian Academy of Sciences, 119991 Moscow, Russia.
| | - Vladimir K Ivanov
- Kurnakov Institute of General and Inorganic Chemistry of the Russian Academy of Sciences, 119991 Moscow, Russia.
- Faculty of Material Science, Lomonosov Moscow State University, 119991 Moscow, Russia.
| | - Sergey Z Vatsadze
- Faculty of Chemistry, Lomonosov Moscow State University, 119991 Moscow, Russia.
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Maekawa H, Noda K, Kuramochi K, Zhang T. Catalyst-Free and Solvent-Controlled Reductive Coupling of Activated Vinyl Triflates with Chlorotrimethylsilane by Magnesium Metal and Its Synthetic Application. Org Lett 2018. [DOI: 10.1021/acs.orglett.8b00496] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Hirofumi Maekawa
- Department of Materials Science and Technology, Nagaoka University of Technology, 1603-1, Kamitomioka-cho, Nagaoka, Niigata 940-2188, Japan
| | - Katsuaki Noda
- Department of Materials Science and Technology, Nagaoka University of Technology, 1603-1, Kamitomioka-cho, Nagaoka, Niigata 940-2188, Japan
| | - Keisuke Kuramochi
- Department of Materials Science and Technology, Nagaoka University of Technology, 1603-1, Kamitomioka-cho, Nagaoka, Niigata 940-2188, Japan
| | - Tianyuan Zhang
- Department of Materials Science and Technology, Nagaoka University of Technology, 1603-1, Kamitomioka-cho, Nagaoka, Niigata 940-2188, Japan
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7
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Zhang T, Maekawa H. Synthesis of 4-(Trifluoromethyl)cyclopentenones and 2-(Trifluoromethyl)furans by Reductive Trifluoroacetylation of Ynones. Org Lett 2017; 19:6602-6605. [PMID: 29181983 DOI: 10.1021/acs.orglett.7b03302] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Reductive introduction of a fluorine-containing carbon block to readily available conjugated ynones, followed by intramolecular cyclization, successfully gave the corresponding trifluoromethylated cyclopentenones or trifluoromethylated furans in good yields through a simple two-step protocol. The key compound in carbon-carbon bond formation by magnesium-promoted reduction is ethyl trifluoroacetate, which has been rarely used as a fluorine-containing carbon source, especially to electron-deficient carbon atoms in organic synthesis.
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Affiliation(s)
- Tianyuan Zhang
- Department of Materials Science and Technology, Nagaoka University of Technology , 1603-1, Kamitomioka-cho, Nagaoka, Niigata 940-2188, Japan
| | - Hirofumi Maekawa
- Department of Materials Science and Technology, Nagaoka University of Technology , 1603-1, Kamitomioka-cho, Nagaoka, Niigata 940-2188, Japan
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8
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Capaldo L, Fagnoni M, Ravelli D. Vinylpyridines as Building Blocks for the Photocatalyzed Synthesis of Alkylpyridines. Chemistry 2017; 23:6527-6530. [DOI: 10.1002/chem.201701346] [Citation(s) in RCA: 39] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2017] [Indexed: 02/03/2023]
Affiliation(s)
- Luca Capaldo
- PhotoGreen Lab, Department of Chemistry; University of Pavia; viale Taramelli 12 27100 Pavia Italy
| | - Maurizio Fagnoni
- PhotoGreen Lab, Department of Chemistry; University of Pavia; viale Taramelli 12 27100 Pavia Italy
| | - Davide Ravelli
- PhotoGreen Lab, Department of Chemistry; University of Pavia; viale Taramelli 12 27100 Pavia Italy
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9
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Maekawa H. Novel Development of Carbon-Carbon Bond and Carbon-Silicon Bond Formation by Magnesium-promoted Reduction. J SYN ORG CHEM JPN 2017. [DOI: 10.5059/yukigoseikyokaishi.75.240] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Hirofumi Maekawa
- Department of Materials Science and Technology, Graduate School of Engineering, Nagaoka University of Technology
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10
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Facile and highly selective silylation of vinylpyridines at the β-olefinic carbon by magnesium-promoted reduction. Tetrahedron 2016. [DOI: 10.1016/j.tet.2016.03.042] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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