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Transition state analysis at the cross section of photochemistry and organometallic chemistry

Research Project

Project/Area Number 16KT0160
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section特設分野
Research Field Transition State Control
Research InstitutionThe University of Tokyo

Principal Investigator

NAKAJIMA Kazunari  東京大学, 大学院工学系研究科(工学部), 准教授 (10709471)

Research Collaborator NISHIBAYASHI Yoshiaki  
SAKATA Ken  
Project Period (FY) 2016-07-19 – 2019-03-31
Project Status Completed (Fiscal Year 2018)
Budget Amount *help
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2018: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2017: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2016: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
Keywords光化学 / 有機金属化学 / 錯体化学 / アルキル化 / 光触媒 / ニッケル触媒 / ジヒドロピリジン / 光誘起電子移動 / 遷移金属触媒 / 炭素-炭素結合切断反応 / クロスカップリング反応 / 炭素-炭素結合切断 / 有機化学 / 光電子移動触媒
Outline of Final Research Achievements

Our group has found alkylation reactions using a dihydropyridine skeleton based on the combination of a photocatalyst and an organometallic catalyst. However, their reaction mechanisms and key transition states are still need to be clarified. Toward this goal, multiple approaches based on photochemistry and coordination chemistry are required.
In this project, our group applied various methods of photochemistry, coordination chemistry and theoretical studies to illustrate the key transitioin state. As a result, we found that the single electron transfer occurs prior to the radical addition step leading anionic reactivity; the oxidation state of Ni changes I-III during the catalytic cycle. Based on these knowledge, we also succeeded in further application of the reaction system toward other organic synthesis.

Academic Significance and Societal Importance of the Research Achievements

新規有機合成反応の開発には、既開発の反応についての詳細な反応機構解析が有用な情報となる。本研究課題では、最近、本研究代表者らが見出した、光触媒と有機金属触媒を共同で用いる反応系について、光化学と金属錯体化学の両面から、その反応機構と遷移状態にアプローチするものである。
その結果、当初は単なるラジカル反応と思われていたプロセスが、実は電子移動を伴ったアニオン製の遷移状態であることや、有機金属触媒として用いたニッケル触媒種の酸化状態を決定することができた。
これらの知見を生かして、他の有機合成反応にも応用できたことで、有用な有機合成手法を開発することができた。

Report

(4 results)
  • 2018 Annual Research Report   Final Research Report ( PDF )
  • 2017 Research-status Report
  • 2016 Research-status Report
  • Research Products

    (12 results)

All 2019 2018 2017 2016 Other

All Journal Article (3 results) (of which Peer Reviewed: 3 results,  Acknowledgement Compliant: 1 results) Presentation (7 results) (of which Int'l Joint Research: 2 results,  Invited: 2 results) Remarks (2 results)

  • [Journal Article] Cross-Coupling Reactions of Alkenyl Halides with 4-Benzyl-1,4- Dihydropyridines Associated with E to Z Isomerization under Nickel and Photoredox Catalysis2018

    • Author(s)
      Kazunari Nakajima、Xifeng Guo、Yoshiaki Nishibayashi
    • Journal Title

      Chem. Asian J.

      Volume: 13 Issue: 23 Pages: 3653-3657

    • DOI

      10.1002/asia.201801542

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Hydroboration of Alkynes Catalyzed by Pyrrolide-Based PNP Pincer-Iron Complexes2017

    • Author(s)
      Kazunari Nakajima, Takeru Kato, Yoshiaki Nishibayashi
    • Journal Title

      Organic Letters

      Volume: 19 Issue: 16 Pages: 4323-4326

    • DOI

      10.1021/acs.orglett.7b01995

    • Related Report
      2017 Research-status Report
    • Peer Reviewed
  • [Journal Article] Nickel- and Photoredox-Catalyzed Cross-Coupling Reactions of Aryl Halides with 4-Alkyl-1,4-dihydropyridines as Visible Light-Mediated Formal Nucleophilic Alkylation Reagents2016

    • Author(s)
      K. Nakajima, S. Nojima, Y. Nishibayashi
    • Journal Title

      Angew. Chem. Int. Ed.

      Volume: 55 Issue: 45 Pages: 14106-14110

    • DOI

      10.1002/anie.201606513

    • Related Report
      2016 Research-status Report
    • Peer Reviewed / Acknowledgement Compliant
  • [Presentation] Nickel- and Photoredox-Catalyzed Hydroalkylation Reactions of Alkynes with 4-Alkyl-1,4-Dihydropyridines2019

    • Author(s)
      Xifeng Guo, Kazunari Nakajima, Yoshiaki Nishibayashi
    • Organizer
      日本化学会第99春季年会2019
    • Related Report
      2018 Annual Research Report
  • [Presentation] ニッケルおよび光電子移動触媒によるハロゲン化ビニル4-アルキル-1,4-ジヒドロピリジンのクロスカップリング反応の開発2018

    • Author(s)
      Xifeng Guo, 中島一成, 西林仁昭
    • Organizer
      第65回有機金属化学討論会
    • Related Report
      2018 Annual Research Report
  • [Presentation] Photoredox-Catalyzed Alkylation Reactions with 4-Alkyl-1,4-dihydropyridines2018

    • Author(s)
      Kazunari Nakajima
    • Organizer
      International CLS Forum on Photo and Catalytic Science for Sustainable Society
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Nickel- and Photoredox-Catalyzed Cross-Coupling Reactions of Vinyl Halides with 4-Alkyl-1,4-Dihydropyridines2018

    • Author(s)
      Xifeng Guo, Kazunari Nakajima, Yoshiaki Nishibayashi
    • Organizer
      日本化学会第98春季年会
    • Related Report
      2017 Research-status Report
  • [Presentation] Photoredox Catalysis Based on C-C Bond Cleavage of 4-Alkyl-1,4-dihydropyridines2017

    • Author(s)
      Kazunari Nakajima, Sunao Nojima, Ken Sakata, Yoshiaki Nishibayashi
    • Organizer
      日本化学会第97春季年会
    • Place of Presentation
      慶應義塾大学日吉キャンパス(神奈川県横浜市)
    • Year and Date
      2017-03-16
    • Related Report
      2016 Research-status Report
  • [Presentation] Visible Light-Mediated Alkylation Reactions Using 1,4-Dihydropyridines as Formal Nucleophilic Alkylation Reagents2017

    • Author(s)
      Kazunari Nakajima
    • Organizer
      International Symposium on Pure & Applied Chemistry (ISPAC) 2017
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Photoredox-Catalyzed Synthetic Utilization of 4-Alkyl-1,4-dihydropyridines as Alkylation Reagents2016

    • Author(s)
      Kazunari Nakajima, Sunao Nojima, Ken Sakata, Yoshiaki Nishibayashi
    • Organizer
      第63回有機金属化学討論会
    • Place of Presentation
      早稲田大学西早稲田キャンパス(東京都新宿区)
    • Year and Date
      2016-09-14
    • Related Report
      2016 Research-status Report
  • [Remarks] 西林研究室ウェブページの研究業績

    • URL

      http://park.itc.u-tokyo.ac.jp/nishiba/publications.html

    • Related Report
      2017 Research-status Report
  • [Remarks] 西林研究室ウェブページの研究業績

    • URL

      http://webpark1495.sakura.ne.jp/publications.html

    • Related Report
      2016 Research-status Report

URL: 

Published: 2016-07-20   Modified: 2023-03-08  

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