New C19-diterpenoid alkaloids from Aconitum piepunense

Area of Science:

• Natural Product Chemistry
• Phytochemistry
• Organic Chemistry

Background:

• Aconitum species are a rich source of bioactive alkaloids.
• Diterpenoid alkaloids possess diverse pharmacological properties.
• Understanding the chemical constituents of Aconitum piepunense is ongoing.

Purpose of the Study:

• To isolate and characterize new alkaloids from Aconitum piepunense roots.
• To elucidate the structures of novel compounds using spectroscopic techniques.
• To contribute to the knowledge of Aconitum alkaloid diversity.

Main Methods:

• Isolation of alkaloids from Aconitum piepunense root extract.
• Structure elucidation using 1D and 2D Nuclear Magnetic Resonance (NMR) spectroscopy.
• High-resolution Mass Spectrometry (HR-MS) for molecular formula determination.

Main Results:

• Two new C(19)-diterpenoid alkaloids, piepunensine A (1) and 18-acetylcammaconine (2), were isolated.
• Five known alkaloids (pengshenine B (3), talatisamine (4), aconosine (5), yunaconitine (6), and talatizidine (7)) were also identified.
• The structures of the new alkaloids were definitively established through comprehensive spectral analysis.

Conclusions:

• The study successfully identified and characterized two novel diterpenoid alkaloids from Aconitum piepunense.
• The findings expand the known chemical profile of this Aconitum species.
• This research provides valuable data for further investigations into the bioactivity of these compounds.