Five new 2-(2-phenylethyl)chromone derivatives from agarwood

Area of Science:

• Natural Product Chemistry
• Medicinal Chemistry
• Pharmacology

Background:

• Agarwood is traditionally used for various medicinal purposes, including aphrodisiac and sedative effects.
• Phytochemical investigation of natural products is crucial for discovering novel therapeutic agents.

Purpose of the Study:

• To isolate and characterize new compounds from agarwood.
• To evaluate the inhibitory activity of isolated compounds against phosphodiesterase (PDE) 3A and 5A1.

Main Methods:

• Isolation of compounds from agarwood using chromatographic techniques.
• Structure elucidation of new compounds utilizing NMR spectroscopy (1D and 2D) and ECD spectroscopy.
• In vitro evaluation of PDE 3A and 5A1 inhibitory activity using the fluorescence polarization method.

Main Results:

• Five new 2-(2-phenylethyl)chromones and eleven known compounds were isolated.
• Dimeric 2-(2-phenylethyl)chromones (compounds 13, 14, 16) exhibited potent inhibition of PDE 5A1 (IC50 values in the low micromolar range).
• Compound 15, a phenylpropionic acid derivative, showed moderate inhibition against both PDE 3A and PDE 5A1.

Conclusions:

• Agarwood is a source of novel 2-(2-phenylethyl)chromone derivatives with significant PDE 5A1 inhibitory activity.
• The dimeric structures appear crucial for potent PDE 5A1 inhibition.
• These findings suggest potential therapeutic applications for agarwood-derived compounds in diseases modulated by PDE 5A1.