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Related Experiment Videos

Vancomycin CD and DE Macrocyclization and Atropisomerism Studies.

Dale L. Boger1, Steven L. Castle, Susumu Miyazaki

  • 1Department of Chemistry and The Skaggs Institute for Chemical Biology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037.

The Journal of Organic Chemistry
|October 25, 2001
PubMed
Summary

Researchers studied vancomycin synthesis, identifying a new epimerization site in the DE ring system. Improvements were made, showing ester substituents at C8 lead to epimerization, unlike carboxamides.

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Area of Science:

  • Organic Synthesis
  • Medicinal Chemistry
  • Stereochemistry

Background:

  • Vancomycin is a crucial antibiotic requiring complex synthesis.
  • Understanding the stereochemistry of its ring systems is vital for total synthesis.
  • Previous synthetic routes faced challenges with stereochemical integrity.

Purpose of the Study:

  • To investigate substituent and protecting group effects on vancomycin CD and DE ring system synthesis.
  • To identify and address epimerization issues in the DE ring system.
  • To develop improved synthetic strategies for vancomycin substructures and the natural product.

Main Methods:

  • Aromatic nucleophilic substitution macrocyclization for biaryl ether formation.
  • Synthesis and characterization of vancomycin DE ring system isomers.

Related Experiment Videos

  • Comparative analysis of ester versus carboxamide substituents at C8, C11, and C14.
  • Development of improved CD ring system synthesis.

    • Main Results:

    • A previously unrecognized epimerization site in the DE ring system was identified.
    • C8 epimerization occurs with ester substituents but not carboxamides.
    • An improved CD ring system synthesis was developed, confirming stereochemical integrity.
    • Fully functionalized CD and DE ring systems were prepared, including deprotection strategies.

    Conclusions:

    • The study refined vancomycin synthesis by addressing epimerization.
    • Carboxamide substituents enhance stereochemical stability at C8.
    • Developed methods are applicable to the synthesis of the vancomycin CDE ring system and the natural product.
    • Antimicrobial activity of key substructures was evaluated.