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Racemization in Prins cyclization reactions.

Ramesh Jasti1, Scott D Rychnovsky

  • 1Department of Chemistry, University of California-Irvine, 1102 Natural Sciences II, Irvine, CA 92697-2025, USA.

Journal of the American Chemical Society
|October 13, 2006
PubMed
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New Prins cyclization mechanisms reveal racemization pathways. Isotopic labeling shows 2-oxonia-Cope rearrangements cause optical activity loss, influenced by reaction conditions and precursor structure.

Area of Science:

  • Organic Chemistry
  • Reaction Mechanisms

Background:

  • Prins cyclization is a valuable synthetic tool.
  • Understanding racemization mechanisms is crucial for stereoselective synthesis.

Purpose of the Study:

  • To elucidate the mechanism of racemization in Prins cyclization reactions.
  • To identify factors influencing optical activity loss during these reactions.

Main Methods:

  • Isotopic labeling experiments were conducted.
  • Variations in reaction conditions (solvent, temperature, nucleophile) were tested.
  • Structural features of Prins cyclization precursors were analyzed.

Main Results:

  • A novel racemization mechanism involving 2-oxonia-Cope rearrangements was identified.

Related Experiment Videos

  • A (Z)-oxocarbenium ion intermediate was implicated in the loss of optical activity.
  • Reaction conditions and precursor structure significantly impact enantiomeric excess.

    • Conclusions:

    • The study reveals a new pathway for racemization in Prins cyclizations.
    • Controlling reaction parameters and precursor design is key to maintaining optical purity.