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Related Experiment Videos

Remote stereocontrol using functionalized allylmetal reagents.

Eric J Thomas1

  • 1The School of Chemistry, The University of Manchester, Manchester, M13 9PL, United Kingdom. e.j.thomas@manchester.ac.uk

Chemical Record (New York, N.Y.)
|March 31, 2007
PubMed
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New organobismuth reagents offer stereoselective synthesis of homoallylic alcohols, providing an alternative to toxic organotin compounds. This method achieves complementary stereocontrol for natural product synthesis.

Area of Science:

  • Organic Chemistry
  • Synthetic Chemistry
  • Stereoselective Synthesis

Background:

  • Organotin reagents enable stereoselective synthesis of homoallylic alcohols but pose toxicity and residue concerns.
  • Alk-2-enylgermanium reagents offer analogous stereocontrol to organotins, addressing some limitations.

Purpose of the Study:

  • To investigate alternative reagents for stereoselective homoallylic alcohol synthesis.
  • To develop methods avoiding toxic organotin compounds.
  • To explore the stereochemical outcomes of organobismuth reagents.

Main Methods:

  • Transmetallation of alk-2-enyl(trialkyl)stannanes with tin(IV) halides to form allyltin trihalides.
  • Reaction of allyltin trihalides with aldehydes to produce (3Z)-homoallylic alcohols.

Related Experiment Videos

  • Generation of organobismuth intermediates from allyl bromides and zinc-bismuth(III)iodide.
  • Reaction of organobismuth intermediates with aldehydes to yield (3E)-homoallylic alcohols.

    • Main Results:

    • Alk-2-enyl(trialkyl)stannanes provide efficient 1,5-, 1,6-, and 1,7-stereocontrol in synthesizing (3Z)-homoallylic alcohols.
    • Alk-2-enylgermanium reagents demonstrate effective 1,5- and 1,6-stereocontrol.
    • Organobismuth intermediates yield (3E)-homoallylic alcohols with efficient 1,5-stereocontrol, complementary to organotins and germanes.

    Conclusions:

    • Organobismuth reagents present a viable, less toxic alternative for synthesizing homoallylic alcohols.
    • The stereochemical outcome of organobismuth reagents is complementary to organotin and organogermanium compounds.
    • This chemistry offers new strategies for natural product synthesis with improved safety profiles.