Chemical diversity of essential oils from Asteriscus graveolens (Forssk.) Less.n: Identification of cis-8-acetoxychrysanthenyl acetate as new natural component
Résumé
Asteriscus graveolens is an endemic medicinal plant mainly distributed in south-western Algeria and south-eastern Morocco. The essential oils of leaves, stems and flowers of A. graveolens had been studied by GC, GC-MS and 13C NMR. The spectral data of two nerolidol derivatives (6-oxocyclonerolidiol and 6-hydroxycyclonerolidiol) were reassigned using 1D and 2D NMR. These compounds can be considered as chemical markers of this genus. The structure of a monoterpenic diester bearing to the chrysanthenane skeleton (cis-8-acetoxychrysanthenyl acetate) was reported for the first time using GC-MS, 1D and 2D NMR. The stem and leaf oils was characterized by high content of oxygenated sesquiterpenes with 6-oxocyclonerolidol and 6-hydroxycyclonerolidol as major components and the flower essential oils were dominated by the new monoterpenic compound cis-8-acetoxy chrysanthenyl acetate.