Sesquiterpenoids and other constituents from Senecio argunensis.

Three new sesquiterpenoids, isodauc-7(14)-en-6alpha,10beta-diol (1), 10beta-hydroxyisodauc-6-en-14-al (2), and (7S(*))-opposit-4(15)-en-1beta,7-diol (4), along with ten known compounds have been isolated from the aerial parts of Senecio argunensis. Their structures were established by means of detailed spectroscopic analysis including IR, HR-MS, and 1D NMR and 2D NMR data. The sesquiterpenoids were assayed against Escherichia coli, Staphylococcus aureus and Bacillus subtilis.

Eudesmane sesquiterpenes and other constituents from Aster himalaicus.

From the whole plants of Aster himalaicus, a new eudesmane-type sesquiterpene, 1-oxoeudesm-11(13)-eno-12,8alpha-lactone, along with twelve known compounds, was isolated. The structures of all compounds have been elucidated on the basis of spectroscopic data, including IR, EI-MS, HR-ESI-MS, and 1D- and 2D-NMR data.