Y. Kitano et al., FORMAL TOTAL SYNTHESIS OF TRICHODIENE VIA SKELETAL REARRANGEMENT OF REGIOSELECTIVE PHOTOCHEMICAL [2-CYCLOADDUCTS FROM CYCLOHEXENE DERIVATIVES(2]), Journal of the Chemical Society. Perkin transactions. I, (8), 1996, pp. 829-835
A formal total synthesis of trichodiene 1 is accomplished via the phot
ochemical [2 + 2] cycloaddition of 3-methylcyclohex-2-enone with methy
l cyclohex-1-enecarboxylate to give methyl (1 alpha,2 beta,7 beta,8 -6
-oxotricyclo[6.4.0.0(2,7)]dodecan-1-carboxylate, and its skeletal rear
rangement to give a tricyclo [6.4.0.0(2,6)] dodecene derivative. Cleav
age of the central five-membered ring of the tricyclo[6.4.0.0(2,6)] do
decene and modification of functional groups leads to the synthesis of
trichodiene 1.