Highly Stereoselective [4+2] Cycloaddition of Azlactones to β,γ-Unsaturated α-Ketoesters Catalyzed by an Axially Chiral Guanidine Base
作者:Masahiro Terada、Hiroyuki Nii
DOI:10.1002/chem.201003015
日期:2011.2.7
cycloaddition reaction of azlactones with β,γ‐unsaturated α‐ketoesters was demonstrated by taking advantage of the multiple reactive sites on the azlactone with the use of an axially chiral guanidine‐base catalyst. The most likely reaction pathway involves three consecutive steps to provide a facile access to α‐amino δ‐lactones with a sugar framework in a highly stereoselective manner (see scheme).