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Development of Boropeptide Chemistry Based on Asymmetric C-H Borylation

Research Project

Project/Area Number 20K21183
Research Category

Grant-in-Aid for Challenging Research (Exploratory)

Allocation TypeMulti-year Fund
Review Section Medium-sized Section 33:Organic chemistry and related fields
Research InstitutionHokkaido University

Principal Investigator

Sawamura Masaya  北海道大学, 理学研究院, 教授 (40202105)

Project Period (FY) 2020-07-30 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥6,500,000 (Direct Cost: ¥5,000,000、Indirect Cost: ¥1,500,000)
Fiscal Year 2021: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Fiscal Year 2020: ¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000)
Keywordsアミノボロン酸 / ボロペプチド / 不斉合成 / ペプチド / アミノ酸 / 有樹ホウ素化合物 / 不斉触媒 / C-H活性化 / C-Hホウ素化 / 環状ペプチド
Outline of Research at the Start

Rh触媒N隣接C(sp3)-H不斉ホウ素化反応の原理が適用可能なペプチド鎖を擬似アミノ酸残基を含め検証するとともに、ボロペプチドを基質としたペプチド鎖伸長反応や環化反応を開発する。具体的にはイソシアネート型ペプチドへのボロペプチドの分子間付加反応がペプチド鎖伸長法として有用であることを実証し、環状ペプチド合成法に発展させる。また、ハロゲン化芳香族側鎖を含むペプチドを基質とした環化カップリングによる環状ペプチドの合成法の開発も目指した研究も実施する。

Outline of Final Research Achievements

An asymmetric C-H boration reaction was attempted using peptide compounds with various structures as reaction substrates, but due to the difficulty in synthesizing the substrate and to the fact that the boration reaction did not proceed as expected, we did not obtain any useful results. Regarding the synthesis of medium molecular peptides containing unnatural amino acids, it was found that the reaction between an alkylboronate and an isocyanate proceeded efficiently under the reaction conditions using a rhodium catalyst. In the palladium-catalyzed reaction of aryl halides, the sterieochemistry of the coupling reaction is reversed depending on whether the reaction substrate is a boronate produced from a secondary amide or a tertiary amide. However, as the above studies proceeded, it gradually became clear that the reproducibility of the C-H boration reaction was not good, resulting in a significant delay in the progress of the research.

Academic Significance and Societal Importance of the Research Achievements

アミノ酸のカルボキシル基がボロン酸で置換された化合物はボロアミノ酸と呼ばれ、これを含むペプチド系化合物(ボロペプチド)は医薬原体として実際に利用されている。現在は分子量が小さなボロペプチドが開発されているが、中分子領域でのボロペプチドの機能には大きな可能性が期待されるところである。本研究では通常のペプチドの主鎖C-H結合の直接ホウ素化活性を種々検討し、今後の研究に活用可能な有用な情報が得られた。また、αーイソシアノメチルボロネート及びその誘導体を用いるボロペプチド合成法について検討した結果から、有機ホウ素化合物の化学的性質を理解する上での有用な情報が得られた。

Report

(2 results)
  • 2021 Final Research Report ( PDF )
  • 2020 Research-status Report
  • Research Products

    (7 results)

All 2021 2020 Other

All Journal Article (2 results) (of which Int'l Joint Research: 2 results,  Peer Reviewed: 2 results) Presentation (3 results) (of which Invited: 2 results) Remarks (1 results) Patent(Industrial Property Rights) (1 results)

  • [Journal Article] Asymmetric Synthesis of a-Aminoboronates via Rhodium-Catalyzed Enantioselective C(sp3)-H Borylation2020

    • Author(s)
      Reyes, R. L., Sato, M., Iwai, T., and Sawamura, M.
    • Journal Title

      Journal of the American Chemical Society

      Volume: 142 Issue: 1 Pages: 589-597

    • DOI

      10.1021/jacs.9b12013

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Asymmetric Remote C-H Borylation of Aliphatic Amides and Esters with a Modular Iridium Catalyst2020

    • Author(s)
      Reyes, R. L., Sato, M. Iwai, T., Suzuki, K., Maeda, S., and Sawamura, M.
    • Journal Title

      Science

      Volume: 369 Issue: 6506 Pages: 970-974

    • DOI

      10.1126/science.abc8320

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Presentation] Asymmetric Remote C-H Bond Borylation with a Modular Iridium Catalyst2021

    • Author(s)
      Ronald L. Reyes, Miyu Sato, Tomohiro Iwai, Kimichi Suzuki, Satoshi Maeda, Masaya Sawamura
    • Organizer
      日本化学会第101春季年会
    • Related Report
      2020 Research-status Report
  • [Presentation] Strategic Construction of Molecular Complexity via Asymmetric Remote C-H Borylation: Building Structural Diversity from Common Feedstock Chemicals2020

    • Author(s)
      Ronald L. Reyes, Miyu Sato, Tomohiro Iwai, Kimichi Suzuki, Satoshi Maeda, Masaya Sawamura
    • Organizer
      Joint Symposium of School of Science & WPI-ICReDD in Hokkaido University
    • Related Report
      2020 Research-status Report
    • Invited
  • [Presentation] 果てしない配位子づくりの面白さ2020

    • Author(s)
      澤村正也
    • Organizer
      金沢大学先駆けプロジェクト2020セミナー/第2回大宮研究室ー武田薬品バーチャルシンポジウム
    • Related Report
      2020 Research-status Report
    • Invited
  • [Remarks] 北海道大学大学院理学研究院化学部門有機金属化学研究室

    • URL

      https://wwwchem.sci.hokudai.ac.jp/~orgmet/index.php?id=1

    • Related Report
      2020 Research-status Report
  • [Patent(Industrial Property Rights)] 単座配位尿素化合物を含む配位子とそれを含むホウ素化触媒2020

    • Inventor(s)
      澤村正也、岩井智弘、ロナルド・ラゾ・レイス、前田理
    • Industrial Property Rights Holder
      澤村正也、岩井智弘、ロナルド・ラゾ・レイス、前田理
    • Industrial Property Rights Type
      特許
    • Industrial Property Number
      2020-133238
    • Filing Date
      2020
    • Related Report
      2020 Research-status Report

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Published: 2020-08-03   Modified: 2024-12-25  

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