Employing commercially available 1,5-cyclooctadiene 5 as the starting mater
ial, the first total synthesis of the tricyclic sesquiterpene hydrocarbon k
elsoene 3 has been accomplished, which also reaffirms its assigned structur
e. The basic strategy delineated here for the construction of the tricyclo[
6.2.0.0(2,6)]decane framework is eminently suitable for the synthesis of ot
her members of this class. (C) 1999 Elsevier Science Ltd. All rights reserv
ed.