Catalytic Asymmetric Formation of δ-Lactones by [4+2] Cycloaddition of Zwitterionic Dienolates Generated from α,β-Unsaturated Acid Chlorides
作者:Paolo S. Tiseni、René Peters
DOI:10.1002/anie.200700859
日期:2007.7.9
Catalytic Asymmetric Formation of δ-Lactones from Unsaturated Acyl Halides
作者:Paolo S. Tiseni、René Peters
DOI:10.1002/chem.200902896
日期:2010.2.22
Previously unexplored enantiopure zwitterionic ammonium dienolates have been utilized in this work as reactive intermediates that act as diene components in hetero‐Diels–Alderreactions (HDAs) with aldehydes to produce optically active δ‐lactones, subunits of numerous bioactive products. The dienolates were generated in situ from E/Z mixtures of α,β‐unsaturated acid chlorides by use of a nucleophilic