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Total synthesis of potent antibacterial natural products with unique chemical structures and their structure-activity relationship studies

Research Project

Project/Area Number 20H02920
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 38040:Bioorganic chemistry-related
Research InstitutionTohoku University

Principal Investigator

Kuwahara Shigefumi  東北大学, 農学研究科, 教授 (30170145)

Project Period (FY) 2020-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥17,810,000 (Direct Cost: ¥13,700,000、Indirect Cost: ¥4,110,000)
Fiscal Year 2022: ¥5,590,000 (Direct Cost: ¥4,300,000、Indirect Cost: ¥1,290,000)
Fiscal Year 2021: ¥5,590,000 (Direct Cost: ¥4,300,000、Indirect Cost: ¥1,290,000)
Fiscal Year 2020: ¥6,630,000 (Direct Cost: ¥5,100,000、Indirect Cost: ¥1,530,000)
Keywordsamycolamicin / nonthmicin / aplasmomycin / 抗菌物質
Outline of Research at the Start

相次ぐ薬剤耐性菌の出現により,人類は新たな感染症の脅威に晒されている。本研究では,広い抗菌スペクトルと強力な抗菌力に加えて,耐性を生じにくい新規な構造と作用機序を持つ新しいカテゴリーの抗菌薬の開拓,及び有用腸内細菌叢の保全,常在細菌の耐性化抑制という観点から,病因となっている特定の病原菌だけに有効な狭域抗菌剤の開発を目指して,3つの特異構造天然物について構造活性相関を含めた合成化学的を展開する。

Outline of Final Research Achievements

The total synthesis of amycolamicin, an antibiotic with a unique hybrid molecular structure consisting of five ring systems (A-E units) and potent antibacterial activity against a wide range of drug-resistant bacteria, has been achieved from a known D-lactic acid derivative by a 20-step sequence that features: (1) highly diastereoselective construction of the C ring via a protecting group-free Lewis acid-promoted intramolecular Diels-Alder cyclization of a teraenal-type acyclic precursor; (2) preparation of the D unit via an extremely diastereoselective nucleophilic addition of a vinyllithium derivative to an α-azidoketone intermediate; (3) efficient stereoconvergent N-acylation of an A unit derivatives (α-anomer/β-anomer = 1:1.1) with the CDE unit (thioester derivative). We have also succeeded in synthesizing the western, northern, and southwestern parts of nonthmicin as well as the preparation of the C12-C17 segment of aplasmomycin.

Academic Significance and Societal Importance of the Research Achievements

AmycolamicinのCユニットの調製で用いたヒドロキシ基無保護の分子内Diels-Alder反応は,それまでの類似反応では実現されていなかったequatorialヒドロキシ基を持つtrans-デカリン系の高ジアステレオ選択的構築を達成したものであり,今後の天然物合成に対する貢献は大きい。また,アノマー混合物である二環性N-グリコシドをチオエステルでN-アシル化すると,単一のN-アシル化生成物を収束的に与えるという新知見は,類似天然物の合成における立体制御を大幅に簡略化できることを意味している。各種合成品の構造活性相関研究により,有用な抗菌剤等の開発につながる可能性がある。

Report

(4 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Annual Research Report
  • 2020 Annual Research Report
  • Research Products

    (13 results)

All 2023 2022 2021 2020

All Journal Article (3 results) (of which Peer Reviewed: 3 results) Presentation (10 results) (of which Int'l Joint Research: 1 results,  Invited: 1 results)

  • [Journal Article] Synthesis of the N-Amykitanosyl Tetramic Acid Moiety of Amycolamicin2023

    • Author(s)
      Yasuhiro Meguro, Masaru Enomoto, Shigefumi Kuwahara
    • Journal Title

      European Journal of Organic Chemistry

      Volume: 21 Issue: 13

    • DOI

      10.1002/ejoc.202300075

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Synthesis of amykitanose, an O-carbamoyl sugar component of the antibiotic amycolamicin2022

    • Author(s)
      Yasuhiro Meguro, Yuka Taguchi, Masaru Enomoto, Shigefumi Kuwahara
    • Journal Title

      Tetrahedron Letters

      Volume: 100 Pages: 153891-153891

    • DOI

      10.1016/j.tetlet.2022.153891

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Total Synthesis of the Broad-Spectrum Antibiotic Amycolamicin2022

    • Author(s)
      Meguro Yasuhiro、Ito Junya、Nakagawa Kiyotaka、Kuwahara Shigefumi
    • Journal Title

      Journal of the American Chemical Society

      Volume: 144 Issue: 12 Pages: 5253-5257

    • DOI

      10.1021/jacs.2c00647

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Presentation] 広域抗生物質AmycolamicinのAおよひABユニットの合成研究2023

    • Author(s)
      目黒康洋,榎本賢,桑原重文
    • Organizer
      日本農芸化学会2023年度大会
    • Related Report
      2022 Annual Research Report
  • [Presentation] 広域抗生物質 amycolamicin の全合成2023

    • Author(s)
      目黒康洋,桑原重文
    • Organizer
      日本農芸化学会2023年度大会シンポジウム
    • Related Report
      2022 Annual Research Report
    • Invited
  • [Presentation] Amycolamicinの全合成2022

    • Author(s)
      目黒康洋,伊藤隼哉,仲川清隆,桑原重文
    • Organizer
      第120回有機合成シンポジウム
    • Related Report
      2022 Annual Research Report
  • [Presentation] 抗生物質amycolamicinの全合成2022

    • Author(s)
      目黒康洋,伊藤隼哉,仲川清隆,桑原重文
    • Organizer
      第64回天然有機化合物討論会
    • Related Report
      2022 Annual Research Report
  • [Presentation] 抗生物質amycolamicinのA およひAB ユニットの合成研究2022

    • Author(s)
      目黒康洋,田口優佳,榎本賢,桑原重文
    • Organizer
      令和4年度日本農芸化学会北海道・東北支部合同支部会
    • Related Report
      2022 Annual Research Report
  • [Presentation] 抗生物質amycolamicinのAおよびDEユニットの合成2022

    • Author(s)
      桑原重文,目黒康洋
    • Organizer
      日本農芸化学会2022年度大会
    • Related Report
      2021 Annual Research Report
  • [Presentation] 抗生物質amycolamicinの全合成2022

    • Author(s)
      目黒康洋,伊藤隼哉,仲川清隆,桑原重文
    • Organizer
      日本農芸化学会2022年度大会
    • Related Report
      2021 Annual Research Report
  • [Presentation] Synthetic study of amycolamicin2021

    • Author(s)
      Yasuhiro Meguro, Shigefumi Kuwahara
    • Organizer
      International Chemistry Congress of Pacific Basin Societies 2021
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] アミコラマイシンの全合成研究2020

    • Author(s)
      目黒康洋,桑原重文
    • Organizer
      第62回天然有機化合物討論会
    • Related Report
      2020 Annual Research Report
  • [Presentation] Amycolamicinの全合成研究2020

    • Author(s)
      目黒康洋,桑原重文
    • Organizer
      第31回万有仙台シンポジウム
    • Related Report
      2020 Annual Research Report

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Published: 2020-04-28   Modified: 2024-01-30  

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