Two new iridoids from Verbena officinalis L

Area of Science:

• Phytochemistry
• Natural Product Chemistry
• Organic Chemistry

Background:

• Verbena officinalis L. is a medicinal plant with a rich history of traditional use.
• Iridoids are a significant class of monoterpenes found in many plant species, known for their diverse biological activities.
• Previous research has identified various iridoid compounds in Verbena species, highlighting their phytochemical importance.

Purpose of the Study:

• To isolate and characterize novel iridoid compounds from the aerial parts of Verbena officinalis L.
• To elucidate the chemical structures of these new compounds using advanced spectroscopic methods.
• To contribute to the understanding of the chemical diversity within the Verbenaceae family.

Main Methods:

• Aerial parts of Verbena officinalis L. were subjected to extensive extraction and fractionation processes.
• Various column chromatography techniques were employed for the isolation of individual compounds.
• Structural elucidation was performed using comprehensive spectroscopic analyses, including 1D and 2D Nuclear Magnetic Resonance (NMR) and Mass Spectrometry (MS).

Main Results:

• Two new iridoids, verbeofflin I (3-(5-(methoxycarbonyl)-2-oxo-2H-pyran-3-yl)butanoic acid) and 7-hydroxydehydrohastatoside, were successfully isolated and identified.
• Three known iridoids, verbenalin, 3,4-dihydroverbenalin, and hastatoside, were also isolated.
• Verbeofflin I represents a new class of secoiridoid within the Verbenaceae family.

Conclusions:

• The study successfully identified and characterized two novel iridoids from Verbena officinalis, expanding the known phytochemical profile of the plant.
• The discovery of verbeofflin I, a new secoiridoid class, provides valuable insights into the biosynthetic pathways and structural diversity of iridoids in Verbenaceae.
• These findings contribute to the ongoing exploration of natural products for potential applications in medicine and pharmacology.