Organocatalytic Preparation of Simple β-Hydroxy and β-Amino Esters: Low Catalyst Loadings and Gram-Scale Synthesis
                                
                                    
                                        作者:Hao Jiang、Björn Gschwend、Łukasz Albrecht、Karl Anker Jørgensen                                    
                                    
                                        DOI:10.1021/ol102164y
                                    
                                    
                                        日期:2010.11.5
                                    
                                    A combined amino- and N-heterocyclic carbene (NHC)-catalyzed one-pot reaction sequence for the synthesis of simple enantioenriched beta-hydroxy and beta-amino esters using commercially available catalysts at low catalyst loadings has been developed. The desired products were obtained in high yield and excellent enantiopurity. The generation of quaternary stereocenters and application in gram-scale synthesis were also realized, with no requirements of inert or anhydrous reaction conditions, thus making this transformation a highly practical protocol.