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Catalytic Direct Functionalization of Carboxylic Acids by a Transient Protecting Group Strategy

Research Project

Project/Area Number 21K14633
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 33020:Synthetic organic chemistry-related
Research InstitutionUniversity of Fukui (2022)
Tokyo University of Science (2021)

Principal Investigator

Suzuki Hirotsugu  福井大学, テニュアトラック推進本部, 助教 (60827682)

Project Period (FY) 2021-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2022: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Fiscal Year 2021: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
Keywordsカルボン酸 / 還元的反応 / 炭素ー炭素結合生成反応 / アルドール反応 / Mannich型反応 / 不斉反応 / aldol反応 / 還元的カップリング / 銅触媒
Outline of Research at the Start

カルボン酸は非ステロイド性抗炎症薬などの医薬品などに幅広く含まれる重要な骨格である。そのためカルボン酸を直截的に修飾する方法の開拓は創薬の発展に大きく貢献する。しかし近年の活性部位を保護・脱保護しない直截的な反応の目覚ましい発展にも関わらず、カルボン酸は自身の持つ酸性な水素の影響により、その触媒的かつ直截的な反応は未開拓である。そこで本研究課題では、カルボン酸を還元剤により反応系内で一時的に保護することにより、酸性水素の影響を抑え、カルボン酸の直截的かつ触媒的な反応を実現する。

Outline of Final Research Achievements

Direct functionalization of carboxylic acids has been a challenging topic because of the inherently acidic nature of carboxylic acids. In this research, we succeeded in investigating a transient protecting group strategy, i.e., the carboxylic acid moiety is protected by a silane in situ, which suppresses the undesired side reactions by the acidic proton. The transient protecting group strategy was applied to the α-functionalization of carboxylic acids, such as a reductive aldol reaction and Mannich-type reaction, indicating the successful examples of direct C-C bond-forming reactions of carboxylic acids. Further, we achieved highly stereoselective reactions by using a chiral ligand.

Academic Significance and Societal Importance of the Research Achievements

カルボン酸は医薬品等に広く含まれる骨格であり、複雑な骨格をもつカルボン酸を短工程で得られることは、資源の浪費や廃棄物の生成を抑制することにつながる。そのためカルボン酸の直截的官能基化の開発は医薬品合成の発展に寄与するといえる。これまでのカルボン酸の直截的α位官能基化は塩基に頼った方法が多かったが、本研究では還元的な方法で実現できることをはじめて示した。これはたとえば塩基に弱い官能基を持つようなカルボン酸でも、直截的α位官能基化へ応用できることを示すものであり、カルボン酸の直截的α位官能基化の適用範囲を広げられる。これにより複雑な骨格をもつカルボン酸の短工程合成の新たな方法論を提供できた。

Report

(3 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Research-status Report
  • Research Products

    (7 results)

All 2023 2022 2021

All Journal Article (6 results) (of which Peer Reviewed: 6 results,  Open Access: 3 results) Presentation (1 results)

  • [Journal Article] Diastereo‐ and Enantioselective Reductive Mannich‐type Reaction of α,β‐Unsaturated Carboxylic Acids to Ketimines: A Direct Entry to Unprotected β2,3,3‐Amino Acids2023

    • Author(s)
      Suzuki Hirotsugu、Kondo Sora、Yamada Koichiro、Matsuda Takanori
    • Journal Title

      Chemistry - A European Journal

      Volume: 29 Issue: 4

    • DOI

      10.1002/chem.202202575

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Rhodium-catalyzed C6-Selective Alkoxycarbonylation of Pyridones2022

    • Author(s)
      Suzuki Hirotsugu、Ito Yuki、Matsuda Takanori
    • Journal Title

      Chemistry Letters

      Volume: 51 Issue: 7 Pages: 775-777

    • DOI

      10.1246/cl.220194

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Copper‐Catalyzed Enantioselective Reductive Aldol Reaction of α,β‐Unsaturated Carboxylic Acids to Alkyl Aryl Ketones: Silanes as Activator and Transient Protecting Group2022

    • Author(s)
      Suzuki Hirotsugu、Yoneoka Kenji、Kondo Sora、Matsuda Takanori
    • Journal Title

      Chemistry - A European Journal

      Volume: 28 Issue: 9

    • DOI

      10.1002/chem.202104273

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] Rhodium-Catalyzed C(sp2)-H Alkoxycarbonylation/Acylation of Indolines with Anhydrides as a Carbonyl Source2022

    • Author(s)
      Suzuki Hirotsugu、Sasamori Fumito、Matsuda Takanori
    • Journal Title

      Organic Letters

      Volume: 24 Issue: 5 Pages: 1141-1145

    • DOI

      10.1021/acs.orglett.1c04195

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Rhodium-catalysed decarbonylative C(sp2)-H alkylation of indolines with alkyl carboxylic acids and carboxylic anhydrides under redox-neutral conditions2022

    • Author(s)
      Suzuki Hirotsugu、Kawai Yuya、Takemura Yosuke、Matsuda Takanori
    • Journal Title

      Organic & Biomolecular Chemistry

      Volume: 20 Issue: 14 Pages: 2808-2812

    • DOI

      10.1039/d2ob00249c

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Rhodium‐Catalyzed Additive‐Free C-H Ethoxycarbonylation of (Hetero)Arenes with Diethyl Dicarbonate as a CO Surrogate2021

    • Author(s)
      Suzuki Hirotsugu、Liao Yumeng、Kawai Yuya、Matsuda Takanori
    • Journal Title

      European Journal of Organic Chemistry

      Volume: 2021 Issue: 35 Pages: 4938-4942

    • DOI

      10.1002/ejoc.202100956

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Presentation] 銅触媒による無保護カルボン酸の還元的Mannich型反応の開発2021

    • Author(s)
      近藤 大空, 鈴木 弘嗣, 松田 学則
    • Organizer
      第11回CSJ化学フェスタ2021
    • Related Report
      2021 Research-status Report

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Published: 2021-04-28   Modified: 2024-01-30  

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