Two new C19-diterpenoid alkaloids from Aconitum straminiflorum

Area of Science:

• Natural Products Chemistry
• Organic Chemistry
• Pharmacognosy

Background:

• Aconitum species are a rich source of bioactive alkaloids.
• Diterpenoid alkaloids possess diverse pharmacological properties.
• Aconitum straminiflorum is a lesser-studied species for its chemical constituents.

Purpose of the Study:

• To isolate and characterize novel C19-diterpenoid alkaloids from Aconitum straminiflorum.
• To elucidate the chemical structures of the isolated compounds.
• To contribute to the understanding of the chemical diversity within the Aconitum genus.

Main Methods:

• Extraction of alkaloids from the roots of Aconitum straminiflorum.
• Isolation of compounds using chromatographic techniques.
• Structure elucidation employing spectroscopic analyses: Infrared (IR) spectroscopy, Electrospray Ionization Mass Spectrometry (ESI-MS), High-Resolution ESI-MS (HR-ESI-MS), 1D Nuclear Magnetic Resonance (NMR) spectroscopy, and 2D NMR spectroscopy.

Main Results:

• Two new C19-diterpenoid alkaloids, designated straconitines A (1) and B (2), were successfully isolated.
• The structure of straconitine A was determined to be 14-benzoylducloudine D.
• The structure of straconitine B was determined to be 6-hydroxy-14-benzoylducloudine D.

Conclusions:

• The study successfully identified and characterized two new diterpenoid alkaloids from Aconitum straminiflorum.
• The findings expand the known chemical library of Aconitum alkaloids.
• This research provides a foundation for further pharmacological investigations of these novel compounds.