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Bis-spirolabdane diterpenoids from Leonotis nepetaefolia
Jun Li1, Frank R Fronczek, Daneel Ferreira
1Department of Pharmacognosy, School of Pharmacy, University of Mississippi, University, Mississippi 38677-1848, USA.
Journal of Natural Products
|April 6, 2012
Summary
Ten new bis-spirolabdane diterpenoids, leonepetaefolins A-E and 15-epi-leonepetaefolins A-E, were isolated from Leonotis nepetaefolia. These compounds were evaluated for their potential to bind to central nervous system (CNS) G-protein-coupled receptors.
Area of Science:
- Natural Product Chemistry
- Phytochemistry
- Organic Chemistry
Background:
- Leonotis nepetaefolia is a plant known for its diverse chemical constituents.
- Diterpenoids and flavonoids are classes of natural products with various biological activities.
Purpose of the Study:
- To isolate and characterize new compounds from Leonotis nepetaefolia.
- To evaluate the binding affinity of isolated compounds to CNS G-protein-coupled receptors.
Main Methods:
- Isolation of compounds using chromatographic techniques.
- Structure elucidation using 1D and 2D Nuclear Magnetic Resonance (NMR) spectroscopy (1H, 13C, DEPT, 1H-1H COSY, HSQC, HMBC, NOESY).
- Determination of absolute configuration via X-ray crystallographic analysis.
Main Results:
- Ten new bis-spirolabdane diterpenoids, named leonepetaefolins A-E and their 15-epi isomers, were identified.
- Eight known labdane diterpenoids and two known flavonoids (apigenin, cirsiliol) were also isolated.
- The binding propensity of the isolated compounds to CNS G-protein-coupled receptors was assessed in vitro.
Conclusions:
- The study successfully identified novel diterpenoid structures from Leonotis nepetaefolia.
- The isolated compounds showed varying binding affinities to CNS G-protein-coupled receptors, suggesting potential neuroactivity.
