Cuparene-related sesquiterpenes

Another collection of A. dactylomela collected from Kohoma Island, Okinawa, on the other hand was found to contain (42) cuparene-related sesquiterpenes — cyclolaurene [33], laurinterol [34], cyclolaurenol [35], cyclolaurenol acetate [36], cupalaurenol [37] and cupalaurenol acetate [3 8]. The authors failed to comment on the presence or absence of chamigrenes in these samples. 

Both 1,4- and 1,5-hydrogen rearrangements have been discovered in the biosynthesis of sesquiterpenes and diterpenes. A 1,4-hydrogen transfer occurs in the formation of the bicarbocyclic nucleus of the trichothecane sesquiterpenes, presumably via the parent hydrocarbon trichodiene 35, 207—209). The biosynthesis of helicobasidine, a closely related cuparene-type sesquiterpene, also has a 1,4-hydrogen rearrangement step 210). 

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