The Dynamic Kinetic Resolution of Azlactones with Thiol Nucleophiles Catalyzed by Arylated, Deoxygenated Cinchona Alkaloids
                                
                                    
                                        作者:Zaida Rodríguez-Docampo、Cormac Quigley、Sean Tallon、Stephen J. Connon                                    
                                    
                                        DOI:10.1021/jo202662d
                                    
                                    
                                        日期:2012.3.2
                                    
                                    A significant improvement of the available organocatalytic methods (in terms of product substrate scope and product enantiomeric excess) for the generation of enantioenriched alpha-amino acid thioesters via the dynamic kinetic resolution of azlactones is reported. C-9 arylated cinchona alkaloid catalysts have been found to be considerably superior to other bifunctional alkaloid catalysts as the promoters of this asymmetric process.