Terpenoids—XXXII

Recent aspects of sesquiterpenoid chemistry

“…The absolute configuration at position 10 was established as by isolation of the known dienone (18). When the toluene-p-sulphonate of dihydrocyclopyrethrosin was heated with collidine the non-conjugated diene (21) was isolated, which requires that the 1-hydroxyl group should be e q ~a t o r i a l . ~…”

Volatile constituents of vetiver: a review

“…Many eudesmane derivatives are present in VEO (Table ), and among them, junenol 130 was the first constituent for which absolute stereochemistry could be determined . As a major constituent of Khus oil, it could be easily extracted and fully characterized by chemical transformations and IR spetroscopy, and its absolute configuration has been confirmed by synthesis from santanolide . Later, Weyerstahl reported its presence in Haitian VEO .…”

“…[60,141] As a major constituent of Khus oil, it could be easily extracted and fully characterized by chemical transformations and IR spetroscopy, and its absolute configuration has been confirmed by synthesis from santanolide. [141,142] Later, Weyerstahl reported its presence in Haitian VEO. [64] Among the other eudesmane sesquiterpenoids, vetiselinenol 123 should be mentioned as it is one of the main alcohols of VEO, identified during the early investigations on this material.…”

Secondary Metabolites of Plants from the Genus Saussurea: Chemistry and Biological Activity

“…Saussureal (57) was isolated from the root of S. lappa and showed high growth-regulatory activity [52]. Shaligram et al performed transformation from a 5/6/5-ring to a 6/6/5-ring system [69]. Hydrogenation of 57 with Pd/C in EtOH gave a mixture 57a/57b (Scheme 3).…”