K. Kaliappan et Gsrs. Rao, SYNTHESIS BASED ON CYCLOHEXADIENES .24. A NEW TOTAL SYNTHESIS OF PUPUKEAN-2-ONE AND A FACILE ENTRY TO COPA AND YLANGA TYPE SESQUITERPENE SKELETONS, Journal of the Chemical Society. Perkin transactions. I, (22), 1997, pp. 3393-3399
A novel tandem 5-exo-trig allyl and 3-exo-trig radical cyclisation and
rearrangement to copa and ylanga type sesquiterpene skeletons from ea
sily prepared cyclohexadienes is reported, A new total synthesis of pu
pukean-2-one 8, which belongs to a novel class of sesquiterpenes, invo
lving a 5-exo-trig allyl radical cyclisation as the key step is also r
eported.