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Author Spotlight: Methanol-Based Whole-Mount Preparation for the Investigation of Retinal Ganglion Cells
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Withanolide artifacts formed in methanol.

Cong-Mei Cao1, Huaping Zhang, Robert J Gallagher

  • 1Department of Medicinal Chemistry, University of Kansas , Lawrence, Kansas 66045, United States.

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|October 25, 2013
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Summary
This summary is machine-generated.

Researchers synthesized five artificial withanolides from Physalis longifolia, including three novel compounds. These compounds resulted from intramolecular and intermolecular Michael additions, highlighting potential artifacts in Solanaceous species.

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Area of Science:

  • Natural Product Chemistry
  • Organic Synthesis
  • Phytochemistry

Background:

  • Physalis longifolia is a source of bioactive withanolides.
  • Withanolides are a class of steroidal lactones with diverse biological activities.
  • Chemical processing can lead to the formation of artifactual compounds.

Purpose of the Study:

  • To synthesize artificial withanolides from naturally occurring compounds found in Physalis longifolia.
  • To characterize the structures of newly formed withanolides.
  • To investigate the potential for Michael addition artifacts in Solanaceous plants.

Main Methods:

  • Methanolysis of main withanolides (6-8) from Physalis longifolia.
  • Isolation and purification of artificial withanolides (1-5).
  • Structure elucidation using spectroscopic methods.
  • Literature review of withanolide artifacts in Solanaceae.

Main Results:

  • Five artificial withanolides (1-5) were synthesized, including three new compounds (1-3).
  • Compounds 1 and 2 were identified as intramolecular Michael addition products.
  • Compounds 3-5 were identified as intermolecular Michael addition products.
  • A literature search identified other potential withanolide Michael addition artifacts.

Conclusions:

  • Methanolysis of Physalis longifolia withanolides can generate artificial compounds via Michael addition.
  • The study identified novel intramolecular and intermolecular Michael addition derivatives.
  • These findings are relevant for understanding artifact formation in the analysis of Solanaceous plants.