Diterpenoid Alkaloids from Delphinium caeruleum.

Area of Science:

• Natural Product Chemistry
• Phytochemistry
• Organic Chemistry

Background:

• Delphinium caeruleum is a plant species known for its potential medicinal properties.
• Alkaloids, particularly diterpenoid alkaloids, are a significant class of natural products with diverse biological activities.
• Previous phytochemical investigations of Delphinium species have revealed a rich array of alkaloids.

Purpose of the Study:

• To isolate and characterize novel and known compounds from Delphinium caeruleum.
• To contribute to the understanding of the chemical constituents of the Delphinium genus.
• To identify new sources of potentially bioactive diterpenoid alkaloids.

Main Methods:

• Phytochemical analysis of Delphinium caeruleum extract.
• Isolation of compounds using chromatographic techniques.
• Structure elucidation of isolated compounds using spectral data (e.g., NMR, MS).

Main Results:

• A new minor diterpenoid alkaloid, named caeruline (1), was isolated and its structure elucidated.
• Three known diterpenoid alkaloids, tatsiensine, delcosine, and lycoctonine, were also isolated.
• This marks the first reported occurrence of tatsiensine, delcosine, and lycoctonine in Delphinium caeruleum.

Conclusions:

• The phytochemical investigation of Delphinium caeruleum led to the discovery of a new diterpenoid alkaloid, caeruline.
• The study expands the known alkaloid profile of Delphinium caeruleum by identifying three previously unreported known alkaloids.
• These findings enhance the chemotaxonomic understanding of the Delphinium genus and provide a basis for further pharmacological studies.