Sesquiterpenoids from Hedychium yunnanense and Porana discifera, and the structural revision of two sesquiterpenoids from Laggera pterodonta
Titel:
Sesquiterpenoids from Hedychium yunnanense and Porana discifera, and the structural revision of two sesquiterpenoids from Laggera pterodonta
Auteur:
Zhu, W.-M. Zhao, Q. Li, S.-L. Hao, X.-J.
Verschenen in:
Journal of Asian natural products research
Paginering:
Jaargang 9 (2007) nr. 3 pagina's 277-283
Jaar:
2007-04
Inhoud:
A new eudesmane-type sesquiterpenoid, hedytriol (1), was isolated from Hedychium yunnanense (Zingiberaceae). By means of chemical and spectroscopic methods, the structure of 1 was determined as ( - )-7aH-eudesmane-1β, 4α, 11-triol. A new ent-eudesmane sesquiterpenoid, disciferitriol (2), was isolated from Porana discifera (Convolvulaceae), which was exactly the enantiomer of hedytriol (1). The structures of pterodondiol (3a) and pterodontriol B (3), previously isolated from Laggera pterodonta, were revised on the basis of X-ray diffraction, as well as chemical transformations.