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Alkaloids from Alstonia angustifolia.

Toh-Seok Kam1, Yeun-Mun Choo

  • 1Department of Chemistry, University of Malaya, 50603 Kuala Lumpur, Malaysia.

Phytochemistry
|March 9, 2004
PubMed
Summary

Researchers discovered six novel alkaloids from the Alstonia angustifolia plant leaves. Structural analysis confirmed these new compounds, contributing to the understanding of plant-derived alkaloids.

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Area of Science:

  • Natural Product Chemistry
  • Phytochemistry
  • Organic Chemistry

Background:

  • Alstonia angustifolia is a plant species known for its diverse phytochemical constituents.
  • Alkaloids are a significant class of natural products with various biological activities.
  • Previous research has identified numerous alkaloids from Alstonia species.

Purpose of the Study:

  • To isolate and characterize novel alkaloid compounds from the leaf extract of Alstonia angustifolia var. latifolia.
  • To elucidate the chemical structures of newly identified alkaloids.
  • To expand the known chemical diversity of Alstonia angustifolia.

Main Methods:

  • Extraction of alkaloids from Alstonia angustifolia var. latifolia leaves.
  • Isolation of compounds using chromatographic techniques.
  • Structure elucidation of new alkaloids utilizing Nuclear Magnetic Resonance (NMR) and Mass Spectrometry (MS) analyses.

Main Results:

  • Six new alkaloids were successfully isolated and identified: alstolactone, affinisine oxindole, lagumicine, N(4)-demethylalstonerine, N(4)-demethylalstonerinal, and 10-methoxycathafoline N(4)-oxide.
  • A total of 42 alkaloids were obtained, including 36 known compounds.
  • The structures of the novel alkaloids were confirmed through comprehensive spectroscopic data (NMR and MS).

Conclusions:

  • The leaf extract of Alstonia angustifolia var. latifolia is a rich source of diverse alkaloids.
  • The identification of six new alkaloids expands the known phytochemical profile of this plant species.
  • This study contributes valuable chemical information on Alstonia angustifolia alkaloids, potentially aiding future pharmacological investigations.

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