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Two new maytansinoids from maytenus buchananii
1Department of Chemistry, Virginia Commonwealth University, P.O. Box 842006, Richmond, Virginia 23284-2006, USA.
Journal of Natural Products
|March 17, 1999
Summary
Two novel maytansinoids, 2'-N-demethylmaytanbutine and maytanbicyclinol, were isolated from Maytenus buchananii. Maytanbicyclinol is the first maytansinoid featuring two macrocyclic rings discovered in this genus.
Area of Science:
- Natural Product Chemistry
- Organic Chemistry
- Pharmacognosy
Background:
- Maytenus species are a rich source of bioactive maytansinoids.
- Maytansinoids are known for their potent cytotoxic properties.
- Previous research has identified various maytansinoid structures from Maytenus plants.
Purpose of the Study:
- To isolate and characterize novel maytansinoids from Maytenus buchananii.
- To elucidate the chemical structures of newly discovered compounds.
- To identify maytansinoids with unique structural features.
Main Methods:
- Large-scale fractionation of Maytenus buchananii extracts.
- Structure elucidation using electrospray mass spectrometry (ESI-MS).
- Nuclear magnetic resonance (NMR) spectroscopy, including 1H, 13C, and 2D NMR techniques.
Main Results:
- Isolation of two new maytansinoids: 2 -N-demethylmaytanbutine (2) and maytanbicyclinol (3).
- Determination of the complete structures of both compounds via spectroscopic analysis.
- Identification of maytanbicyclinol as the first reported maytansinoid with two macrocyclic rings from a Maytenus species.
Conclusions:
- The study expands the known diversity of maytansinoids.
- The discovery of maytanbicyclinol highlights unique structural adaptations in Maytenus natural products.
- These findings contribute to the understanding of maytansinoid biosynthesis and potential applications.