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A Concise Enantioselective Approach to Quassinoids.

William P Thomas1, Sergey V Pronin1

  • 1Department of Chemistry, University of California, Irvine, California 92697-2025, United States.

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|December 27, 2021
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Summary

Researchers developed a novel synthetic route to quassinoids, a class of natural products. This method enables the enantioselective synthesis of quassin, a complex tetracyclic molecule, in just 14 steps.

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Area of Science:

  • Organic Chemistry
  • Natural Product Synthesis

Background:

  • Quassinoids are a diverse class of naturally occurring compounds with a wide range of biological activities.
  • The complex tetracyclic structure of quassinoids presents significant synthetic challenges.

Purpose of the Study:

  • To develop a novel and efficient synthetic strategy for accessing the tetracyclic core of quassinoids.
  • To achieve an enantioselective synthesis of the natural product quassin.

Main Methods:

  • A key annulation reaction between two unsaturated carbonyl components was employed.
  • Catalytic hydrogen atom transfer from an iron hydride to an alkene initiated the key C-C bond formation.
  • The strategy was applied to the total synthesis of quassin.

Main Results:

  • An efficient and selective annulation strategy for constructing the tetracyclic quassinoid core was established.
  • The total synthesis of quassin was accomplished in 14 steps from commercially available starting materials.
  • The synthesis proceeded with high enantioselectivity.

Conclusions:

  • The developed synthetic approach provides a viable route to quassinoids.
  • This methodology offers a powerful tool for the synthesis of complex natural products.
  • The enantioselective synthesis of quassin highlights the efficiency of the strategy.