Two new oplopane sesquiterpenes from Artemisia gmelinii Web. ex Stechm

Two novel sesquiterpenes and one new monoterpene from the aerial part of Artemisia tournefortiana

Two novel sesquiterpenes and one new monoterpene, together with eight reported compounds were isolated from dichloromethane-soluble extract of the aerial part of Artemisia tournefortiana Reichb. Their relative and absolute structures were elucidated based on the analysis of 1D and 2D NMR spectra, HRESIMS, and calculated electronic circular dichroism (ECD). Two sesquiterpenes (1 and 2) showed no inhibition effect in anti-inflammatory and cytotoxic activity tests. Three new terpenes (1-3) were tested for antibacterial activity, compounds 2 and 3 showed moderate antibacterial activities with minimum inhibitory concentrations (MICs) between 264 and 556 μg/ml.

Highly oxygenated sesquiterpenes in Artemisia alba Turra

Ten new sesquiterpene alcohols of which seven germacranes, a eudesmane, a guaiane and an oplopane were isolated from the aerial parts of Artemisia alba Turra. Their structures and relative stereochemistry were elucidated by spectral methods ((1)H and (13)C NMR, COSY, HSQC, HMBC, NOESY, and MS). In addition, the known 7-hydroxycadin-4-en-3-one, centaureidin and axillarin were found for the first time in the studied species.