Site-Selective and Enantioselective α,β,γ-Functionalization of 5-Alkylidenefuran-2(5<i>H</i>)-ones: A Route to Polycyclic γ-Lactones
作者:Anna Skrzyńska、Sebastian Frankowski、Marek Moczulski、Piotr Drelich、Łukasz Albrecht
DOI:10.1021/acs.orglett.8b03796
日期:2019.3.1
γ-functionalization of the γ-lactone framework in the corresponding 5-alkylidenefuran-2(5H)-ones is reported. The developed approach is based on a stereocontrolledcascadereaction with 2-mercaptocarbonyl compounds proceeding in a sequence of thia-Michael/aldol/oxa-Michael reactions. Such a synthetic strategy allows for a construction of a unique polycyclic architecture containing γ-lactone, tetrahydrofuran, and
Synthesis of γ,γ-Disubstituted Butenolides through a Doubly Vinylogous Organocatalytic Cycloaddition
作者:Anna Skrzyńska、Piotr Drelich、Sebastian Frankowski、Łukasz Albrecht
DOI:10.1002/chem.201804650
日期:2018.11.7
organocatalytic approach to γ,γ‐disubstituted butenolides is described. It is based on a fully site‐selective functionalization of 5‐alkylidenefuran‐2(5H)‐ones via trienamine‐mediated [4+2]‐cycloaddition with α,β,γ,δ‐diunsaturated aldehydes. The developed methodology proceeds with excellent stereocontrol and constitutes a unique example of trienamine chemistry with vinylogous dienophiles. Importantly,