Two new acorane sesquiterpenes from Illicium henryi

Area of Science:

• Natural Product Chemistry
• Organic Chemistry
• Pharmacology

Background:

• Illicium henryi is a plant source of bioactive compounds.
• Sesquiterpenes are a class of natural products with diverse biological activities.

Purpose of the Study:

• To isolate and characterize new compounds from Illicium henryi.
• To evaluate the inhibitory effects of isolated compounds on nitric oxide (NO) production.

Main Methods:

• Isolation of compounds using chromatographic techniques.
• Structure elucidation using spectroscopic data analysis (e.g., NMR, MS).
• In vitro assay to measure NO production inhibition.

Main Results:

• Two new acorane sesquiterpenes (10-hydroxyacoronene and 1beta-isopropyl-4beta-methyl-9beta-hydroxy spiro[4.5]dec-6-en-8-one) and one new tetralone (4-hydroxy-4, 6-dimethyl-1-tetralone) were identified.
• A known acorane sesquiterpene, acoradiepoxide, was also isolated.
• Compounds 10-hydroxyacoronene and acoradiepoxide demonstrated slight inhibitory effects on NO production (IC50 values of 82.4 and 76.5 microg/mL, respectively).

Conclusions:

• The chemical investigation of Illicium henryi yielded novel sesquiterpenes and a tetralone.
• The isolated compounds, particularly 10-hydroxyacoronene and acoradiepoxide, exhibit mild inhibitory activity against NO production, warranting further investigation for anti-inflammatory potential.