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Five new iboga alkaloids from Tabernaemontana corymbosa
1Department of Chemistry, University of Malaya, 50603 Kuala Lumpur, Malaysia. tskam@kimia.um.edu.my
Journal of Natural Products
|May 25, 2002
Summary
Five new indole alkaloids were discovered in the Malayan plant Tabernaemontana corymbosa. These iboga-type compounds were identified using advanced spectroscopic and comparative analyses.
Area of Science:
- Natural Product Chemistry
- Phytochemistry
- Organic Chemistry
Background:
- Tabernaemontana corymbosa is a Malayan plant species.
- Indole alkaloids, particularly of the iboga type, are known for their diverse biological activities.
Purpose of the Study:
- To isolate and characterize new indole alkaloids from Tabernaemontana corymbosa.
- To expand the knowledge of iboga-type alkaloids found in this species.
Main Methods:
- Extraction from leaf and stem-bark of Tabernaemontana corymbosa.
- Isolation of five new and twelve known iboga alkaloids.
- Structure elucidation using Nuclear Magnetic Resonance (NMR) and Mass Spectrometry (MS) analyses.
- Comparison with existing data for related compounds.
Main Results:
- Five novel indole alkaloids of the iboga type were identified: 19(S)-hydroxyibogamine (1), 19-epi-isovoacristine (2), isovoacryptine (3), 3R/S-ethoxyheyneanine (4), and 3R/S-ethoxy-19-epi-heyneanine (5).
- Twelve additional known iboga alkaloids were also isolated from the plant extract.
- The structures of the new compounds were confirmed through comprehensive spectroscopic data.
Conclusions:
- The study successfully identified new iboga-type indole alkaloids from Tabernaemontana corymbosa.
- This research contributes to the understanding of the chemical diversity within the Tabernaemontana genus.
- The findings provide a basis for further investigation into the potential pharmacological properties of these newly discovered alkaloids.