Friedelanes from celastraceae

Friedelanes are the most frequently triterpenes isolated from Celastraceae. The co-occurrence of friedelanes and quinonemethides in several species, both in whole plants and cell cultures, has led to propose a biogenetic relationship between these two types of triterpenoids [17,21], Fig. (1). 

Oleanes comform the other group of triterpenes found in Celastraceae that- with friedelanes- are the most common skeletons isolated from the family. 

The structure and stereochemistry of prionostemmadione (114), a new friedelane derivative from Prionostemma aspera (Celastraceae), has been established by X-ray crystal analysis. The same plant also yielded a new triterpenoid... 

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