Enantio- and Diastereoselective Synthesis of β,γ,γ,δ-Tetrasubstituted α-Methylene-δ-lactones
作者:Henryk Krawczyk、Łukasz Albrecht、Dariusz Deredas、Jakub Wojciechowski、Wojciech Wolf
DOI:10.1055/s-0031-1289629
日期:2012.1
The synthesis of two α-(diethoxyphosphoryl)-α,β-unsaturated δ-lactones with 98% ee has been developed using (S)-3-aryl-3-hydroxy-2,2-dimethylpropanals, easily accessible via direct, asymmetric organocatalytic aldol reaction, as the starting materials. The lactones were transformed into the corresponding α-methylene-δ-lactones in a two-step process involving Michaeladditionfollowed by Horner-Wadsworth-Emmons