Sesquiterpene lactone glucosides from Sonchus asper.

Area of Science:

• Phytochemistry
• Natural Products Chemistry
• Organic Chemistry

Background:

• Sonchus asper (common sowthistle) is a plant species known to produce various secondary metabolites.
• Sesquiterpene lactones and their glycosides are a significant class of natural products with diverse biological activities.

Purpose of the Study:

• To isolate and characterize novel and known compounds from the methanolic extract of Sonchus asper roots.
• To elucidate the chemical structures of isolated sesquiterpene glucosides and aglycones.

Main Methods:

• Methanolic extraction of Sonchus asper roots.
• Chromatographic separation techniques (e.g., column chromatography) for isolation of compounds.
• Spectroscopic analysis (e.g., NMR, Mass Spectrometry) for structure elucidation.

Main Results:

• Isolation of two new sesquiterpene glucosides.
• Isolation of two known sesquiterpene glucosides.
• Isolation of one known aglycone.
• Structural identification of all isolated compounds, including 11beta,13-dihydrourospermal A and its derivatives, and 14-O-methylacetal-15-O-[6'-(p-hydroxyphenylacetyl)]-beta-D-glucopyranosylurospermal A.

Conclusions:

• The chemical investigation of Sonchus asper roots yielded a mixture of known and novel sesquiterpene glucosides.
• Spectroscopic data confirmed the structures of the isolated compounds, contributing to the phytochemical knowledge of the Sonchus genus.