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Related Experiment Videos

O-alkenyl hydroxylamines: a new concept for cyclofunctionalization.

Roderick W Bates1, Kanicha Sa-Ei

  • 1Laboratory of Medicinal Chemistry, Chulabhorn Research Institute, Vibahavadi-Rangsit Highway, Laksi, Bangkok 10210, Thailand. roderick@tubtim.cri.or.th

Organic Letters
|November 22, 2002
PubMed
Summary

This study details the synthesis of isooxazolidines from O-homoallylhydroxylamines using palladium and copper catalysts. Electron-withdrawing groups on the nitrogen are crucial for this transformation, yielding cis isomers with carbamate protection.

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Area of Science:

  • Organic Chemistry
  • Catalysis
  • Heterocyclic Chemistry

Background:

  • O-homoallylhydroxylamines are versatile precursors in organic synthesis.
  • Palladium and copper catalysis offer efficient routes to complex molecules.
  • Isooxazolidines are important heterocyclic compounds with various applications.

Purpose of the Study:

  • To develop a novel synthetic method for isooxazolidines.
  • To investigate the role of catalyst systems (palladium(II) and copper(II)) in the reaction.
  • To explore the influence of substituents on the hydroxylamine nitrogen.

Main Methods:

  • Treatment of O-homoallylhydroxylamines with palladium(II) and copper(II) catalysts.
  • Reaction conducted in the presence of a base, methanol, and carbon monoxide.

Related Experiment Videos

  • Utilizing electron-withdrawing groups, specifically carbamates, on the hydroxylamine nitrogen.
  • Main Results:

    • Successful formation of isooxazolidines from O-homoallylhydroxylamines.
    • Demonstrated the necessity of an electron-withdrawing group on the hydroxylamine nitrogen.
    • Observed exclusive formation of cis isomers when carbamate groups were employed.

    Conclusions:

    • A new palladium- and copper-catalyzed carbonylation reaction provides access to isooxazolidines.
    • Electron-withdrawing groups on the nitrogen are essential for this cyclization.
    • Carbamate-protected hydroxylamines yield stereoselective cis-isooxazolidines.