Annulation Reactions of Allenyl Esters: An Approach to Bicyclic Diones and Medium-Sized Rings
作者:Bilal A. Bhat、Samantha L. Maki、Elijah J. St.Germain、Pradip Maity、Salvatore D. Lepore
DOI:10.1021/jo501700c
日期:2014.10.3
approach to construct sterically congested bicyclo-alkenedione frameworks is reported. Under the action of potassium carbonate, α-sulphonyl cycloalkanones are added to functionalized allenyl esters, leading to a lactone intermediate that is subsequently reduced to initiate an intramolecular aldol cyclization to [3.2.1], [3.3.1], and [4.3.1] bicycles. Oxidation then affords bicyclic diones in good three-step