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A unique "chiral amplification" exerted in a molecule with a multi-fold dynamic chiral space

Research Project

Project/Area Number 21K05031
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 33010:Structural organic chemistry and physical organic chemistry-related
Research InstitutionHokkaido University

Principal Investigator

KATOONO Ryo  北海道大学, 理学研究院, 助教 (60432142)

Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2023: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2022: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2021: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Keywordsテレフタルアミド / マクロサイクル / 三重結合 / ねじれ優先性 / 協同性 / 面不斉 / モル旋光度 / キラリティ伝達 / 多元的動的キラル空間 / キラル増幅 / 多元的キラル空間 / "キラル増幅"
Outline of Research at the Start

動的にキラルなマクロサイクルを単量体として複数化することにより、多元的な動的キラル空間を創り出す。この単量体マクロサイクルは、単独ではねじれ優先性を発現しない。これを多元的に配置したキラル空間においては、個々のマクロサイクルのねじれ優先性が発現・増幅する現象を想定し、実際に観測することを目的とする。
多量化の方法として、積層と縮環を採用する。前者は、プロトタイプとして定性的な観測を、後者は多元的配置によって生じるねじれ優先性を比として定量的に観測することを期待する。

Outline of Final Research Achievements

A unique "chiral amplification" was demonstrated with two original systems, (I) and (II). In either system, macrocycles are component elements that adopt dynamic chiral forms with P- or M-helicity by twisting clockwise or counterclockwise. Such a dynamic chiral element is repeatedly arranged to form a single molecule by (I) stacking or (II) fusion.
(I) Achiral planes are stacked and bridged at each corner to create a three-fold interlayer. The four-layer cyclophane can adopt two diastereomeric forms (PPP and MMM) by three-fold twisting clockwise or counterclockwise and prefers a particular sense of twisting.
(II) Several helically-twisted macrocycles are arranged through fusion. A series of fused oligomers of macrocycles with a difference in the number (n=2-6) and arrangement (rotational, cyclic, and acyclic) of elements were presented to consider (i) cooperativity in helical-sense preferences and (ii) optical rotation based on molecular structure.

Academic Significance and Societal Importance of the Research Achievements

キラル増幅という用語は、既に多義的に用いられてきた。自身では極めて小さな光学活性しか示さない小分子が、錯体を形成することでより大きな光学活性を示すようになる現象や、鎖状分子あるいは超分子的集合体の伸長に際し、二次的に誘起された別のキラル構造が元の単位構造の光学活性より大きな光学活性を示すようになる現象等をさす。本研究では、光学活性の大小ではなく、分子内に複数の動的キラル構造を配した場合、単独で存在する場合と比べて、集積体中でそのねじれ優先性が増大する新たな現象として定義した。この増幅機構に基づけば、既存の限定的なキラルモチーフに依存せず、多様なキラル高次多量体を設計することが可能になるだろう。

Report

(4 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • Research Products

    (6 results)

All 2023 2022

All Journal Article (6 results) (of which Peer Reviewed: 6 results,  Open Access: 4 results)

  • [Journal Article] Two-ring chirality generated by the alignment of two achiral phenylacetylene macrocycles2023

    • Author(s)
      Katoono Ryo、Arisawa Kohei
    • Journal Title

      RSC Advances

      Volume: 13 Issue: 17 Pages: 11712-11719

    • DOI

      10.1039/d3ra01780j

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Macrocycle of Macrocycles: Endless Succession of an Identical Sense of Twisting2023

    • Author(s)
      Katoono Ryo
    • Journal Title

      Chemistry Letters

      Volume: 52 Issue: 8 Pages: 627-630

    • DOI

      10.1246/cl.230184

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Chiral [1]rotaxanes with a two-fold bridge based on phenylacetylene macrocycles (PAMs): two different chiroptical properties created by 7PAM2023

    • Author(s)
      Katoono Ryo、Asai Kota
    • Journal Title

      Chemistry Letters

      Volume: 53 Issue: 1

    • DOI

      10.1093/chemle/upad006

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] An attempt to consider cooperativity in helical-sense preferences induced in fused macrocycles2023

    • Author(s)
      Katoono Ryo、Kudo Takaaki、Kawai Shunsuke
    • Journal Title

      Organic & Biomolecular Chemistry

      Volume: 21 Issue: 12 Pages: 2562-2569

    • DOI

      10.1039/d3ob00171g

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] A Dualistic Arrangement of a Chiral [1]Rotaxane Based on the Assembly of Two Rings and Two Rods2023

    • Author(s)
      Katoono Ryo、Tanioka Takumi
    • Journal Title

      The Journal of Organic Chemistry

      Volume: 88 Issue: 7 Pages: 4606-4618

    • DOI

      10.1021/acs.joc.3c00069

    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Journal Article] Controlled helical senses of twisting in two-, three- and four-layer cyclophanes with planar chirality2022

    • Author(s)
      Katoono Ryo、Shimomura Kai
    • Journal Title

      Chemical Communications

      Volume: 58 Issue: 96 Pages: 13385-13388

    • DOI

      10.1039/d2cc05742e

    • Related Report
      2022 Research-status Report
    • Peer Reviewed

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Published: 2021-04-28   Modified: 2025-01-30  

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