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(-)-delta-N-normethylskytanthine from Tecoma arequipensis.

G H Harris1, E C Fixman, F R Stermitz

  • 1Department of Chemistry, Colorado State University, Fort Collins 80523.

Journal of Natural Products
|May 1, 1988
PubMed
Summary

The bark of Tecoma arequipensis contains (-)-delta-N-normethylskytanthine, a major alkaloid. Its structure was confirmed via X-ray diffraction, revealing enantiomeric stereochemistry compared to related compounds.

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Area of Science:

  • Phytochemistry
  • Natural Product Chemistry
  • Organic Chemistry

Background:

  • Tecoma arequipensis is a plant species known to produce various chemical compounds.
  • Alkaloids are a diverse group of naturally occurring organic compounds that mostly contain basic nitrogen atoms.
  • Previous studies have identified skytanthine in related plant species like Tecoma stans.

Purpose of the Study:

  • To isolate and elucidate the structure of the major alkaloidal component from Tecoma arequipensis bark.
  • To determine the stereochemistry of the isolated alkaloid.
  • To compare the stereochemistry with previously reported alkaloids from related species.

Main Methods:

  • Extraction of alkaloids from the bark of Tecoma arequipensis.
  • Structure elucidation using X-ray diffraction analysis of an N-thiourea derivative.

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  • Gas chromatography-mass spectrometry (GC-MS) for analysis of crude base fractions.

    • Main Results:

    • Isolation and identification of (-)-delta-N-normethylskytanthine as the major alkaloidal component.
    • Confirmation of the structure and stereochemistry through X-ray diffraction analysis.
    • The stereochemistry was found to be enantiomeric with skytanthine.
    • GC-MS analysis revealed several related alkaloids as minor constituents.

    Conclusions:

    • (-)-delta-N-normethylskytanthine is a significant alkaloid in Tecoma arequipensis.
    • The stereochemical relationship between (-)-delta-N-normethylskytanthine and skytanthine is enantiomeric.
    • Further investigation into the minor alkaloids present in Tecoma arequipensis may be warranted.