Versatile Strategy to Access Tricycles Related to Quassinoids and Triterpenes
作者:Pierre-Yves Caron、Pierre Deslongchamps
DOI:10.1021/ol902711b
日期:2010.2.5
The reactivity of two new bicyclic cyclohexenones (13 and 27) with several Nazarov reagents is presented. A flexible synthetic strategy is developed and provides access to highly substituted tricycles related to quassinoids and triterpenes.
Anionic Polycyclization Entry to Tricycles Related to Quassinoids and Terpenoids: A Stereocontrolled Total Synthesis of (+)-Cassaine
A full account of our anionic polycyclization approach to accesshighlyfunctionalizedtricycles related to quassinoids and terpenoids from several optically active bicyclic enone systems and Nazarov reagents is presented. (+)-Carvone is the only chiral source used to fix the entire stereochemistry of all of the tricycles, and the stereochemical outcome of this process was unambiguously determined