Abstract
Fourteen indole alkaloids, Δ14-isoeburnamine (1), amsosinine (2), tabersonine, vincadifformine, lochnericine, tetrahydroalstonine, β-yohimbine, isoeburnamine, minovicinine, picrinine, strictamine, rhazimine, vincanidine, and decarbomethoxytetrahydrosecamine, were isolated from Amsonia sinensis. Δ14-isoeburnamine (1) and amsosinine (2) are new compounds, their structures have been established by spectral and chemical methods. A known sterol glycoside, daucosterol, has also been obtained. The structures of compounds 1 and 2 were finally confirmed by X-ray diffraction of single crystals.
Key words
Amsonia sinensis
- Apocynaceae - indole alkaloids - Δ14-isoeburnamine - amsosinine
