An easy access to bioactive 13-hydroxylated and 11,13-dihydroxylated sesquiterpene lactones (SLs) through Michael addition of a nucleophilic hydroxyl group
作者:Francisco A. Macías、María D. García-Díaz、Guillermo M. Massanet、José F. Gómez-Madero、Frank R. Fronczek、Juan C.G. Galindo
DOI:10.1016/j.tet.2008.09.024
日期:2008.12
The addition of a hydroxyl group to α,β-unsaturated carbonyl systems provides a new and easy access to bioactive difunctionalized sesquiterpene lactones (SLs) through a Michael addition to the α-methylene-γ-lactone system. The use of HMPA to enhance the nucleophilic properties of the hydroxyl groups and to stabilize the enolate is discussed. Also, we present a proposal for the mechanism based on the