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2015 Fiscal Year Annual Research Report

天然有機化合物の構造解析をサポートする実践的な計算化学利用法

Research Project

Project/Area Number 26660093
Research InstitutionHirosaki University

Principal Investigator

橋本 勝  弘前大学, 農学生命科学部, 教授 (40212138)

Co-Investigator(Kenkyū-buntansha) 根平 達夫  広島大学, 総合科学研究科, 准教授 (60321692)
Project Period (FY) 2014-04-01 – 2016-03-31
Keywords天然物 / 分子起動計算 / NMR化学シフト予想
Outline of Annual Research Achievements

本研究課題では、量子化学に基づくスペクトル予想方法のscope and limitationを行い一般的適用法を確立しようというものである。研究の過程でNMR化学シフトは、立体配座にきわめて敏感であることが判明した。配座解析の段階では、時には数十万を超える初期配座を評価する必要があり、計算速度の速い分子力学法を用いることが多い。しかし、力場法は官能基を多数有する分子の再現性は低く、歪んだ分子を想定しておらす、無駄な配座を候補としたり、安定配座に漏れが生じる可能性があることを明らかにした。これは、STO3Gなどある程度高コストな分子軌道法とすることにより、実用的な計算時間で実行できることを見出した。また、計算結果について、計算値と実測値とのズレを構造式上にマッピングすることで、計算が正しく行われたか、判断しやすいこと、また解析にも有効であることを明らかにした。以上の情報を基にEpoxyroussoeone およびEpoxyroussoedioneの構造決定に利用した。上記化合物は分子内に水素原子をほとんど持たないため、そのNMRを利用した構造解析は、非常に困難であったが本手法を適用させることにより、平面構造はもちろん立体構造まで明らかにすることができた。

  • Research Products

    (16 results)

All 2016 2015

All Journal Article (11 results) (of which Peer Reviewed: 9 results,  Acknowledgement Compliant: 6 results) Presentation (5 results) (of which Int'l Joint Research: 1 results,  Invited: 1 results)

  • [Journal Article] Homopetasinic acid isolated from Diaporthe sp. strain 1308-05,2016

    • Author(s)
      A. Ito, I. Kumagai, M. Maruyama, H. Maeda, A. Tonouchi, T. Nehira, K. Kimura, M. Hashimoto,
    • Journal Title

      Tetrahedron Lett.

      Volume: 57 Pages: 1117-1119

    • DOI

      10.1016/j.tetlet.2016.01.095

    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] Isolation, Absolute Structures, and Biological Properties of Cyclohelminthols I–IV from Helminthosporium velutinum yone962016

    • Author(s)
      2.Y. Honmura, S. Uesugi, H. Maeda, K. Tanaka, T. Nehira, K. Kimura, M. Okazaki, M. Hashimoto,
    • Journal Title

      Tetrahedron

      Volume: 72 Pages: 1400-1405

    • DOI

      10.1016/j.tet.2016.01.036

    • Acknowledgement Compliant
  • [Journal Article] Homojesterones: vinylogous analogues of jesterone from Helminthosporium velutinum TS28,2016

    • Author(s)
      M. Arayama, S. Uesugi, K. Tanaka, H. Maeda, T. Nehira, K. Kimura, M. Hashimoto,
    • Journal Title

      Tetrahedron

      Volume: 72 Pages: 1031-1035

    • DOI

      10.1016/j.tet.2015.12.077

    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] Novel himachalene-type sesquiterpenes from male adults of Chinese Windmill butterfly, Byasa alcinous alcinous,2016

    • Author(s)
      Hisashi Ômura, Taro Noguchi, Tatsuo Nehira,
    • Journal Title

      Natural Products Researches,

      Volume: 30 Pages: 406-411

    • DOI

      10.1080/14786419.2015.1019352

    • Peer Reviewed
  • [Journal Article] Cassane diterpenoids from the roots of Caesalpinia decapetala var. japonica and structure revision of caesaljapin2016

    • Author(s)
      6.Sayuri Kamikawa, Shiori Oshimo, Emi Ohta, Tatsuo Nehira, Hisashi Ômura, Shinji Ohta
    • Journal Title

      Phytochemistry

      Volume: 121 Pages: 50-57

    • DOI

      10.1016/j.phytochem.2015.10.001

    • Peer Reviewed
  • [Journal Article] Structure Revision of Caesalpinista A and Caesalpinista B and Isolation of a New Furanoditerpenoid from the Cotyledons of Caesalpinia decapetala var. japonica2016

    • Author(s)
      Sayuri Kamikawa, Emi Ohta, Tatsuo Nehira, Hisashi Ômura, Shinji Ohta
    • Journal Title

      Helvetica Chimica Acta

      Volume: 99 Pages: 133-137

    • DOI

      10.1002/hlca.201500171

    • Peer Reviewed
  • [Journal Article] Computation-Assisted Structural Elucidation of Epoxyroussoeone and Epoxyroussoedione Isolated from Roussoella japanensis KT16512015

    • Author(s)
      Yuna Honmura, Hiroto Takekawa, Kazuaki Tanaka, Hayato Maeda, Tatsuo Nehira, Warren Hehre, and Masaru Hashimoto
    • Journal Title

      J. Nat. Prod.

      Volume: 78 Pages: 1505-1510

    • DOI

      DOI: 10.1021/np500924n

    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] Isolation, ECD Assisted Structural Analyses, Biosynthetic Discussions, and Biological activities of epi-Cochlioquinones D and its Derivatives,2015

    • Author(s)
      M. Arayama, T. Nehira, H. Maeda, K. Tanaka, H. Miyagawa, T. Ueno, S. Hosokawa, M. Hashimoto
    • Journal Title

      Tetrahedron

      Volume: 71 Pages: 4788-4794

    • DOI

      10.1016/j.tet.2015.05.044

    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] Achaetolide-II isolated from Helminthosporium velutinum TS28"2015

    • Author(s)
      .Miki Arayama, Hayato Maeda, Kazuaki Tanaka, Noboru Takada, Tatsuo Nehira, Masaru Hashimoto
    • Journal Title

      Tetrahedron

      Volume: 71 Pages: 7900-7905

    • DOI

      10.1016/j.tet.2015.08.013

    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] Niphateolide A, Isolation from the marine sponge Niphates olemda and determination of its absolute configuration by an ECD analysis2015

    • Author(s)
      2.Hikaru Kato, Tatsuo Nehira, Koichi Matsuo, Tetsuo Kawabata, Yoshihiri Kobashigawa, Hiroshi Morioka, Fitji Losung, Remy E. P. Mangindaan, Nicole J. de Voogd, Hideyoshi Yokosawa, Sachiko Tsukamoto
    • Journal Title

      Tetrahedron

      Volume: 71 Pages: 6956-6960

    • DOI

      10.1016/j.tet.2015.07.009

    • Peer Reviewed
  • [Journal Article] Taichunamides: Unprecedented Prenylated Indole Alkaloids from Aspergillus taichungensis (IBT 19404)2015

    • Author(s)
      9.Ippei Kagiyama, Hikaru Kato, Tatsuo Nehira, Jens C. Frisvad, David H. Sharman, Robert M, Williams, Sachiko Tsukamoto
    • Journal Title

      Angewandte Chemie International Edition

      Volume: 55 Pages: 1128-1132

    • DOI

      10.1002/anie.201509462

  • [Presentation] Cochlioquinone 化学の新展開―ECD の徹底活用と新たな生物活性考察2015

    • Author(s)
      荒山美紀、前多隼人、田中和明、根平達夫、宮川恒、上野民夫、細川誠二郎、橋本勝
    • Organizer
      University of Saskatchewan Special Simminor
    • Place of Presentation
      yokohama
    • Year and Date
      2015-09-10 – 2015-09-10
  • [Presentation] Isolation, ECD Assisted Structural Analyses, Biosynthetic Discussions, and Biological activities of epi-Cochlioquinones D and its Derivatives2015

    • Author(s)
      M. Arayama, T. Nehira, H. Maeda, K. Tanaka, H. Miyagawa, T. Ueno, S. Hosokawa, M. Hashimoto
    • Organizer
      15th International Conference on Chiral Spectroscopy
    • Place of Presentation
      札幌
    • Year and Date
      2015-08-31 – 2015-08-31
    • Int'l Joint Research / Invited
  • [Presentation] Bioorganic Studies on Mycoparasitism on Apple Fruites2015

    • Author(s)
      Masaru Hashimoto
    • Organizer
      University of Saskatchewan Special Simminor
    • Place of Presentation
      サスカチュワン
    • Year and Date
      2015-08-19 – 2015-08-19
  • [Presentation] Phomolide Cの相対及び絶対配置の決定2015

    • Author(s)
      伊藤厚、殿内暁夫、橋本勝
    • Organizer
      第10回化学生態学研究会
    • Place of Presentation
      函館
    • Year and Date
      2015-06-13 – 2015-06-13
  • [Presentation] 分子軌道計算支援による新規マクロフォリンの構造決定2015

    • Author(s)
      橋本勝, 本村優奈, 根平達夫
    • Organizer
      第10回化学生態学研究会
    • Place of Presentation
      函館
    • Year and Date
      2015-06-13 – 2015-06-13

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Published: 2017-01-06  

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