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Development of Novel Oxidative Transformation Based on Heterometallic Electron Transfer

Research Project

Project/Area Number 11450341
Research Category

Grant-in-Aid for Scientific Research (B).

Allocation TypeSingle-year Grants
Section一般
Research Field 有機工業化学
Research InstitutionOsaka University

Principal Investigator

HIRAO Toshikazu  Graduate School of Enginneering, Professor, 大学院・工学研究科, 教授 (90116088)

Co-Investigator(Kenkyū-buntansha) MORIUCHI Toshiyuki  Osaka University, Graduate School of Enginneering, Research Assistant, 大学院・工学研究科, 助手 (60281119)
SAKURAI Hidehiro  Osaka University, Graduate School of Enginneering, Assistant Professor, 大学院・工学研究科, 講師 (00262147)
小川 昭弥  大阪大学, 大学院・工学研究科, 助教授 (30183031)
Project Period (FY) 1999 – 2000
Project Status Completed (Fiscal Year 2000)
Budget Amount *help
¥14,100,000 (Direct Cost: ¥14,100,000)
Fiscal Year 2000: ¥6,300,000 (Direct Cost: ¥6,300,000)
Fiscal Year 1999: ¥7,800,000 (Direct Cost: ¥7,800,000)
Keywordsoxovanadium / redox / ate complex / organozinc compound / oxidative coupling / 還元的離脱 / 有機アルミニウム化合物 / 有機ホウ素化合物 / 有機亜鉛化合物 / 還元的脱離
Research Abstract

One-electron oxidation of main-group organometallics by one-electron redox with transition metals permits a novel reaction behavior based on the change of the electronic state on metals, which is considered to provide novel synthetic reactions. If transmetallation takes place instead, the reactivities based on the characteristics of the introduced metals are expected to widen the scope of synthetic methods via organometallic intermediates. Oxovanadium compounds with one-electron oxidation capability are employed for this purpose in this research project. The oxidative transformations of organometallics have been investigated to provide versatile methods for selective carbon-carbon bond formation.
1) Oxovanadium (V) compounds like VO (OEt) Cl_2 serve as useful oxidants for organozinc compounds, providing the corresponding cross-coupling products derived from two ligands of organozinc compounds. In particular, triorganozincates undergo selective cross-coupling smoothly by the action of oxovanadium (V).
2) VO (OEt) Cl_2 induces oxidative ligand coupling of aryltrimethylzincates, prepared from bromoarenes and Me_4ZnLi_2, giving the corresponding methylarenes.
3) Oxovanadium (V) compounds induce nucleophilic α, β-vicinal dialkylation of cyclic α, β-enones with dialkylzinc reagents. Alkylzinc enolates, generated from cyclic enones and lithium trialkylzincates, are oxidized by VO (OEt) Cl_2, giving 2, 3-dialkylcycloalkanones. The one-pot transformation is possible without isolation of the intermediate complexes and considered to be of synthetically potetial.
The redox interaction between main-group organometallics and oxovanadium compounds is demonstrated to permit these transformations. The coupling is recognized to be formal reductive elimination of the organometallics, which has been less accessible by conventional methods.

Report

(3 results)
  • 2000 Annual Research Report   Final Research Report Summary
  • 1999 Annual Research Report
  • Research Products

    (8 results)

All Other

All Publications (8 results)

  • [Publications] T.Hirao: "Oxovanadium (V)-Induced Vicinal Dialkylation of Cyclic Enones with Organozinc Compounds"Organic Letters. 2,23. 3659-3661 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] T.Takada: "Oxovanadium (V)-Induced Oxidative Ligand Coupling of Aryltrimethyl-zincates Prepared from Bromoarenes and Dilithium Tetramethylzincate"The Journal of Organic Chemistry. 66,1. 300-302 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] T.Hirao: "Oxovanadium (V)-Induced Vicinal Dialkylation of Cyclic Enones with Organozinc Compounds"Organic Letters. 2. 3659-3661 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] T.Takada: "Oxovanadium (V)-Induced Oxidative Ligand Coupling of Aryltrimethylzincates Prepared from Bromoarenes and Dilithium Tetramethylzincate"The Journal of Organic Chemistry. 66. 300-302 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] T.Hirao: "Oxovanadium (V)-Induced Vicinal Dialkylation of Cyclic Enones with Organozinc Compounds"Organic Letters. 2,23. 3659-3661 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] T.Takada: "Oxovanadium (V)-Induced Oxidative Ligand Coupling of Aryltrimethylzincates Prepared from Bromoarenes and Dilithium Tetramethylzincate"The Journal of Organic Chemistry. 66,1. 300-302 (2001)

    • Related Report
      2000 Annual Research Report
  • [Publications] T.Ishikawa: "Oxovanadium(V)-Induced Oxidation of Alkenylzirconoces for Facile Inter-and Intramolecular Coupling"J.Oraganometal.Chem.. 575,1. 76-79 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] T.Hirao: "Oxovanadium(V)-Induced Cross-Coupling Reaction between Two Ligands of Organozinc Compounds"J.Org.Chem.. (印刷中).

    • Related Report
      1999 Annual Research Report

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Published: 1999-04-01   Modified: 2016-04-21  

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