Bicyclic diterpenes-clerodanes

Bicyclic diterpenes-clerodanes. An important group of Insect antifeedants are the clerodane diterpenoids, which have been isolated from several different plant families (13)(Figure 1). Particularly well studied are the antifeedant activities of caryoptln and clerodin, and their derivatives, from Clerodendron and Caryopteris, Verbenaceae, against the tobacco cutworm Spodoptera litura L. (25-27). 

Cocarcinogenic Diterpenes from the Euphorbiaceae and Thymelaeaceae Bicyclic Diterpenes Manool Derivatives Labdane Derivatives Clerodane Derivatives Tricyclic Diterpenes... 

Diterpenoid distribution was contrasted to that of other terpenoids for the two genera, Baccharis and Helianthus. These two taxa were selected for a more detailed examination, because their chemistries represented the two major types of diterpene complements a bicyclic labdane/clerodane type Baccharis) and a polycyclic type Helianthus). 

We ve classified more than 550 diteipenoids (listed in Table 3 whith corresponding sources) from all the reported Salvia species which we ve divided into 2 categories. The first one contains the monocyclic and bicyclic diterpenoids including labdanes and clerodanes and related diterpenes. The second category concerns tricyclic and tetracyclic diterpenes including pimaranes and abietanes and related diterpenes. The clerodane type diterpenes are mainly represented by american species while abietane type are found in european and asian species. 

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