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Synthesis of an Intein-mediated Artificial Protein Hydrogel
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A Concise Total Synthesis of (±)-Vibralactone.

Sepand K Nistanaki1, Luke A Boralsky1, Roy D Pan1

  • 1Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, CA, 90095, USA.

Angewandte Chemie (International Ed. in English)
|December 15, 2018
PubMed
Summary

A novel five-step synthesis of the natural product (±)-vibralactone was developed using a photochemical reaction. This efficient route establishes key structural features early, offering the shortest synthesis to date for this biologically active terpenoid.

Keywords:
cyclopropanationhousanephotochemistryring expansiontotal synthesis

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Area of Science:

  • Organic Chemistry
  • Natural Product Synthesis
  • Photochemistry

Background:

  • Vibralactone is a biologically active terpenoid natural product.
  • Efficient synthesis of complex natural products is crucial for further study.
  • Existing synthetic routes may be lengthy or lack key stereochemical control.

Purpose of the Study:

  • To develop a concise and efficient five-step synthesis of (±)-vibralactone.
  • To establish a modular synthetic strategy for accessing the natural product.
  • To report the shortest total synthesis of (±)-vibralactone to date.

Main Methods:

  • Photochemical valence isomerization of a 3-prenyl-pyran-2-one precursor.
  • Cyclopropanation of a bicyclic β-lactone intermediate.
  • Sequential ring expansion and reduction strategy.

Main Results:

  • A five-step synthesis of (±)-vibralactone was successfully achieved.
  • The key photochemical step efficiently generated the quaternary stereocenter and β-lactone.
  • The synthesis produced a strained housane intermediate, which was converted to the target natural product.

Conclusions:

  • The developed synthetic route is the shortest reported total synthesis of (±)-vibralactone.
  • The modular approach highlights the utility of photochemical reactions in natural product synthesis.
  • This efficient synthesis provides a valuable method for accessing biologically active vibralactone.