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Thirteen novel cycloartane-type triterpenes from Combretum quadrangulare
A H Banskota1, Y Tezuka, K Q Tran
1Institute of Natural Medicine, Toyama Medical and Pharmaceutical University, 2630-Sugitani, Toyama 930-0194, Japan.
Journal of Natural Products
|January 29, 2000
Summary
Thirteen new cycloartane-type triterpenes were identified from the Vietnamese plant Combretum quadrangulare. This research introduces novel compounds with unique structural features, expanding the known diversity of these natural products.
Area of Science:
- Natural Product Chemistry
- Organic Chemistry
- Phytochemistry
Background:
- Combretum quadrangulare is a Vietnamese medicinal plant.
- Cycloartane-type triterpenes are a class of natural products with diverse biological activities.
- The chemical diversity within this genus is not fully explored.
Purpose of the Study:
- To isolate and characterize novel cycloartane-type triterpenes from Combretum quadrangulare.
- To elucidate the structures of these new compounds using spectroscopic and chemical methods.
- To identify unique structural motifs within the isolated triterpenes.
Main Methods:
- Isolation of thirteen novel cycloartane-type triterpenes.
- Structure elucidation using advanced spectroscopic techniques (e.g., NMR, MS).
- Confirmation of structures through chemical transformations.
Main Results:
- Identification of thirteen new cycloartane-type triterpenes.
- Discovery of quadrangularic acids F, G, H and 24-epiquadrangularic acid G, the first cycloartane-type triterpenes with carboxylic acid groups at C-4 and C-20.
- Isolation of norquadrangularic acid A, the first trinorcycloartane-type triterpene from the Combretum genus.
Conclusions:
- Combretum quadrangulare is a rich source of structurally unique cycloartane-type triterpenes.
- The identified compounds, particularly those with dual carboxylic acid groups and the trinor derivative, represent significant additions to the known chemical structures in this class.
- This study expands the chemical diversity of natural products from the Combretum genus.