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Cyclopeptide alkaloids from Paliurus ramossisimus.

H Y Lin1, C H Chen, B J You

  • 1School of Pharmacy, College of Medicine, National Taiwan University, Taipei 100, Taiwan, Republic of China.

Journal of Natural Products
|November 15, 2000
PubMed
Summary

Researchers isolated seven zizyphine A-type cyclopeptide alkaloids from Paliurus ramossisimus roots. Six novel compounds, paliurines A-F, were structurally elucidated using advanced spectroscopic techniques.

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Area of Science:

  • Natural Product Chemistry
  • Phytochemistry
  • Organic Chemistry

Background:

  • Paliurus ramossisimus is a plant source of bioactive compounds.
  • Cyclopeptide alkaloids represent a significant class of natural products with diverse biological activities.

Purpose of the Study:

  • To isolate and characterize novel cyclopeptide alkaloids from the roots of Paliurus ramossisimus.
  • To elucidate the chemical structures of these isolated compounds using comprehensive spectroscopic methods.

Main Methods:

  • Isolation was achieved through a combination of centrifugal partition chromatography and conventional separation techniques.
  • Structural characterization involved Mass Spectrometry (MS) and Nuclear Magnetic Resonance (NMR) spectral analyses, including detailed analysis of (13)C NMR data.

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  • Stereochemistry of terminal dipeptides was confirmed by comparison with synthetic dipeptides.

    • Main Results:

    • Seven zizyphine A-type cyclopeptide alkaloids were successfully isolated.
    • Six of these alkaloids, designated paliurines A-F (compounds 1-6), were identified as novel compounds.
    • The structures of paliurines A-F were fully elucidated, and their terminal dipeptide stereochemistry was confirmed.

    Conclusions:

    • The study successfully identified and characterized novel cyclopeptide alkaloids from Paliurus ramossisimus.
    • The findings contribute to the understanding of the chemical diversity of Paliurus species and cyclopeptide alkaloids.
    • The detailed structural information provides a basis for further investigation into the biological activities of these compounds.