Diterpenoid Alkaloids from Delphinium majus.

Area of Science:

• Natural Product Chemistry
• Phytochemistry
• Organic Chemistry

Background:

• Delphinium species are known sources of biologically active alkaloids.
• Diterpenoid alkaloids represent a significant class of natural products with diverse chemical structures and potential bioactivities.
• Comprehensive chemical investigation of medicinal plants is crucial for discovering novel compounds.

Purpose of the Study:

• To isolate and characterize new diterpenoid alkaloids from the whole herbs of Delphinium majus.
• To elucidate the chemical structures of the isolated novel compounds using advanced spectroscopic techniques.

Main Methods:

• Extraction of secondary metabolites from the whole herbs of Delphinium majus.
• Isolation of compounds using chromatographic techniques (e.g., column chromatography, HPLC).
• Structure elucidation of isolated compounds through interpretation of extensive spectroscopic data (NMR, MS, etc.).

Main Results:

• Isolation of three new C(19)-diterpenoid alkaloids, named majusines A-C (compounds 1-3).
• Isolation of six new C(20)-diterpenoid alkaloids, including majusimines A-D (compounds 4-7) and majusidine A and B (compounds 8 and 9).
• Identification of 15 previously known compounds alongside the nine novel alkaloids.

Conclusions:

• The chemical investigation of Delphinium majus yielded a rich array of novel diterpenoid alkaloids.
• The structural diversity of the isolated alkaloids, majusines and majusimines, expands the known chemical space of Delphinium natural products.
• Spectroscopic data interpretation was effective in confirming the structures of the newly discovered compounds.