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Related Experiment Videos

Easy Synthesis of Functionalized Hetero[7]helicenes.

Spencer D. Dreher1, Daniel J. Weix, Thomas J. Katz

  • 1Department of Chemistry, Columbia University, New York, New York, 10027.

The Journal of Organic Chemistry
|October 25, 2001
PubMed
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Conversion of a [6]Helicene into an [8]Helicene and a Helical 1,10-Phenanthroline Ligand.

The Journal of organic chemistry·2001
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Efficient Synthesis of Functionalized [7]Helicenes.

The Journal of organic chemistry·2001
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New heterohelicenebisquinones were synthesized on a multigram scale. These compounds, derived from dibenzofuran, dibenzothiophene, and carbazole, were resolved into enantiomers, and their absolute configurations were determined.

Area of Science:

  • Organic Chemistry
  • Stereochemistry
  • Materials Science

Background:

  • Helicenes and their derivatives are important chiral molecules with unique photophysical properties.
  • Developing efficient synthetic routes for complex polycyclic aromatic hydrocarbons is crucial for advancing materials science.

Purpose of the Study:

  • To develop a scalable synthesis for novel hetero[7]helicenebisquinones.
  • To resolve these synthesized compounds into their enantiomers.
  • To assign the absolute configurations of the resulting enantiomers.

Main Methods:

  • Multigram scale synthesis utilizing silyl enol ethers of 3,6-diacetyldibenzofuran, 3,6-diacetyldibenzothiophene, and 3,6-diacetylcarbazole.
  • Reaction with p-benzoquinone to form the hetero[7]helicenebisquinone core structure.

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  • Chiral resolution using a previously established method for carbohelicenebisquinones.

    • Main Results:

    • Successful synthesis of hetero[7]helicenebisquinones on a multigram scale.
    • Effective resolution of the synthesized compounds into their respective enantiomers.
    • Assignment of the absolute configurations for the resolved enantiomers.

    Conclusions:

    • The developed synthetic strategy provides efficient access to a range of hetero[7]helicenebisquinones.
    • The established resolution technique is applicable to these novel chiral compounds.
    • This work contributes to the understanding of stereochemistry in complex heterocyclic systems.