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Related Experiment Videos

Tethered aminohydroxylation: dramatic improvements to the process.

Timothy J Donohoe1, Carole J R Bataille, William Gattrell

  • 1Department of Chemistry, University of Oxford, Chemistry Research Laboratory, Mansfield Road, Oxford OX1 3TA, UK. timothy.donohoe@chem.ox.ac.uk

Organic Letters
|March 29, 2007
PubMed
Summary
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A new hydroxylamine-based reoxidant significantly improves the tethered aminohydroxylation reaction, enabling high yields with low osmium catalyst loading. This breakthrough makes previously unreactive acyclic homoallylic alcohols viable substrates for oxidation.

Area of Science:

  • Organic Chemistry
  • Catalysis
  • Oxidation Reactions

Background:

  • The tethered aminohydroxylation reaction is a valuable synthetic tool.
  • Hydroxylamine-based reoxidants are commonly employed.
  • Certain substrates, like acyclic homoallylic alcohols, have shown limited reactivity.

Purpose of the Study:

  • To enhance the efficiency and substrate scope of the tethered aminohydroxylation reaction.
  • To develop improved hydroxylamine-based reoxidants.
  • To enable the oxidation of previously unreactive acyclic homoallylic alcohols.

Main Methods:

  • Modification of the N leaving group on hydroxylamine-based reoxidants.
  • Systematic investigation of different leaving groups, including OCOCF5.

Related Experiment Videos

  • Optimization of reaction conditions for tethered aminohydroxylation.

    • Main Results:

    • The use of OCOCF5 as a leaving group dramatically improved the reaction.
    • Osmium catalyst loading was reduced to as low as 1 mol %.
    • High yields, up to 98%, were achieved.
    • Acyclic homoallylic alcohols became viable substrates.

    Conclusions:

    • The developed reoxidant offers a significant advancement in tethered aminohydroxylation.
    • The reaction is now applicable to a broader range of substrates, including challenging acyclic homoallylic alcohols.
    • This work provides a more efficient and versatile method for oxidation reactions.