Abstract
Pimarane and cleistanthane diterpenes isolated from Velloziaceae are shown, by CD studies, to possess the same (5S, 10S) absolute configuration. A biomimetic rearrangement of the pimarane into the cleistanthane skeleton is described. The structure of a new natural diterpene, cleistantha-8, 11, 13-trien-7-one is also reported.
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