Cyclization of the linear diterpene precursor usally proceeds along two alternative parallel routes (Figure 2 [p. 392]), one leading to the bicyclic “normal” labdane ( normal-labdane) absolute stereochemistry and the other resulting in its antipodal, enantiomeric (ent-labdane) absolute stereochemistry. As a consequence of these two parallel biosynthetic routes, diterpenes lack the homogeneous absolute stereochemistry of the triterpenes.
KeywordsCarotenoid Epoxide Rosane Tricyclic Prefix
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