Phenolic glycosides from Phagnalon rupestre

Area of Science:

• Phytochemistry
• Natural Product Chemistry
• Organic Chemistry

Background:

• Phagnalon rupestre is a plant species within the Asteraceae family.
• Phenolic compounds are a diverse group of natural products with various biological activities.
• The aerial parts of plants are often rich sources of secondary metabolites.

Purpose of the Study:

• To isolate and characterize phenolic compounds from the aerial parts of Phagnalon rupestre.
• To identify new natural products from this plant species.
• To contribute to the understanding of the chemical constituents of Phagnalon rupestre.

Main Methods:

• Methanolic extraction of aerial parts of Phagnalon rupestre.
• Fractionation of the extract using a butanol-soluble fraction.
• Isolation and purification of phenolic compounds using chromatographic techniques.
• Structure elucidation of isolated compounds using Nuclear Magnetic Resonance (NMR) spectroscopy.

Main Results:

• Seven phenolic compounds were isolated from the butanol-soluble fraction.
• Three new natural compounds were identified: a lignan (1), a prenylhydroquinone glycoside (2), and an acetophenone glycoside (3).
• The structures of the new compounds were determined by NMR spectroscopy.
• Four known compounds were also isolated: apigenin-7-O-beta-glucoside, luteolin-7-O-beta-glucoside, luteolin-7-O-beta-glucuronide, and picein.

Conclusions:

• The study successfully identified seven phenolic compounds from Phagnalon rupestre.
• Three novel natural products were discovered, expanding the known chemical diversity of this plant species.
• The findings provide valuable chemical data on Phagnalon rupestre, potentially supporting further research into its biological activities.