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Related Experiment Videos

Absolute structure of panaxytriol.

Mitsuru Satoh1, Masayoshi Ishii, Mitsuo Watanabe

  • 1Showa College of Pharmaceutical Sciences, Machida, Tokyo, Japan. ms@ac.shoyaku.ac.jp

Chemical & Pharmaceutical Bulletin
|February 5, 2002
PubMed
Summary

Enzyme-mediated acetylation and hydrolysis using CHIRAZYME enabled enantioselective synthesis of panaxatriol. Comparison with natural panaxatriol confirmed the 3R,9R,10R absolute configuration, crucial for ginsenoside research.

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Area of Science:

  • Organic Chemistry
  • Biocatalysis
  • Natural Product Synthesis

Background:

  • Panaxatriol is a key intermediate in the biosynthesis of ginsenosides, important bioactive compounds found in Panax species.
  • Determining the absolute configuration of panaxatriol is essential for understanding its biological activity and for synthetic efforts.
  • Previous methods for determining stereochemistry were limited, necessitating a robust synthetic approach.

Purpose of the Study:

  • To enantioselectively synthesize panaxatriol and its isomers.
  • To determine the absolute configuration of synthetic panaxatriol.
  • To establish a reliable method for stereochemical assignment of panaxatriol using biocatalysis.

Main Methods:

  • Enzyme-mediated acetylation of diastereomeric panaxytriol acetonides using CHIRAZYME and vinyl acetate.

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  • Enzymatic hydrolysis of the resulting acetates to yield alcohols with specific stereochemistry.
  • Deprotection of acetonides to afford panaxatriol and its isomers, followed by comparison of optical rotation values with natural samples.

    • Main Results:

    • Enantioselective acetylation yielded (3R)-acetates and (3S)-alcohols from the diastereomeric mixture.
    • Enzymatic hydrolysis of (3R)-acetates afforded the corresponding (3R)-alcohols.
    • Comparison of optical rotation data confirmed the 3R,9R,10R absolute configuration for synthetic panaxatriol.

    Conclusions:

    • The study successfully established the 3R,9R,10R absolute configuration of panaxatriol through enantioselective synthesis.
    • Biocatalysis using CHIRAZYME provides an efficient and stereoselective route for synthesizing chiral intermediates like panaxatriol.
    • This work contributes to the understanding of ginsenoside chemistry and facilitates future research on their synthesis and biological evaluation.