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Acetylenic Vinyllithiums: Consecutive Cycloisomerization-[4 + 2] Cycloaddition Reactions.

William F. Bailey1, Nanette M. Wachter-Jurcsak, Mark R. Pineau

  • 1Department of Chemistry, University of Connecticut, Storrs, Connecticut 06269-4060, and the Department of Chemistry, Connecticut College, New London, Connecticut 06320-4196.

The Journal of Organic Chemistry
|November 15, 1996
PubMed
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Chemists created isomerically pure conjugated bis-exocyclic 1,3-dienes using a novel lithium-bromine exchange and cyclization method. These dienes are versatile precursors for synthesizing complex polycyclic materials efficiently.

Area of Science:

  • Organic Chemistry
  • Synthetic Methodology
  • Stereoselective Synthesis

Background:

  • Acetylenic vinyllithiums are reactive intermediates in organic synthesis.
  • Accessing conjugated bis-exocyclic 1,3-dienes is challenging.
  • Polycyclic compounds are important in medicinal chemistry and materials science.

Purpose of the Study:

  • To develop an efficient method for synthesizing isomerically pure conjugated bis-exocyclic 1,3-dienes.
  • To explore the scope and limitations of the cyclization reaction for five- and six-membered rings.
  • To demonstrate the utility of these dienes as precursors for polycyclic systems.

Main Methods:

  • Generation of acetylenic vinyllithiums via low-temperature lithium-bromine exchange from acetylenic vinyl bromides.

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  • Intramolecular cyclization of acetylenic vinyllithiums upon warming.
  • Subsequent Diels-Alder reactions of the generated dienes with various dienophiles.

    • Main Results:

    • Isomerically pure conjugated bis-exocyclic 1,3-dienes were obtained in good to excellent yields.
    • The 5-exo cyclization proceeded with total stereocontrol, yielding the E-isomer, and tolerated various substituents.
    • The 6-exo cyclization was less facile, requiring anion-stabilizing groups on the substrate.

    Conclusions:

    • A novel, efficient, and diastereoselective one-pot methodology for synthesizing conjugated bis-exocyclic 1,3-dienes has been established.
    • These dienes are valuable intermediates for constructing diverse polycyclic frameworks via Diels-Alder reactions.
    • The developed method offers a simple and operationally straightforward route to complex molecular architectures.