A Highly Abbreviated Synthesis of Pentalenene by Means of the Squarate Ester Cascade
作者:Leo A. Paquette、Feng Geng
DOI:10.1021/ol020208k
日期:2002.12.1
[GRAPHICS]The sequential addition of 5-methylcyclopentyllithium and propynyllithium to diisopropyl squarate results in the efficient formation of a functionalized angular triquinane having two of its five-membered rings substituted precisely as in the target sesquiterpene. Only seven additional steps are then required to access pentalenene.