Clerodane diterpenoids from Pulicaria wightiana

Area of Science:

• Phytochemistry
• Natural Products Chemistry
• Medicinal Chemistry

Background:

• Pulicaria wightiana is a plant species with potential medicinal properties.
• Natural products research focuses on isolating bioactive compounds from plants.
• Diterpenoids and flavonoids are classes of natural compounds with diverse biological activities.

Purpose of the Study:

• To isolate and characterize chemical constituents from the aerial parts of Pulicaria wightiana.
• To investigate the antibacterial potential of the isolated clerodane diterpenoids.

Main Methods:

• Phytochemical investigation involving isolation techniques.
• Structure elucidation using spectroscopic methods, primarily 1D and 2D Nuclear Magnetic Resonance (NMR) spectroscopy.
• Assessment of antibacterial activity of isolated diterpenoids.

Main Results:

• Five clerodane diterpenoids were successfully isolated.
• Two additional compounds, 3'5,6-trihydroxy-3,4',7-trimethoxyflavone and 2-methyl-5-hydroxy-chroman-4-one, were identified.
• The structures and stereochemistry of all isolated compounds were determined through comprehensive spectral analysis.
• The antibacterial activity of the isolated diterpenoids was evaluated.
• The identified flavone and chromanone derivatives were reported for the first time in this plant species.

Conclusions:

• The aerial parts of Pulicaria wightiana are a source of diverse clerodane diterpenoids and other secondary metabolites.
• The isolated compounds, particularly the diterpenoids, warrant further investigation for their therapeutic potential, including antibacterial applications.