Synthesis of [2.2]paracyclophane-based bidentate oxazoline–carbene ligands for the asymmetric 1,2-silylation of N -tosylaldimines
                                
                                    
                                        作者:Xichao Wang、Zhen Chen、Wenzeng Duan、Chun Song、Yudao Ma                                    
                                    
                                        DOI:10.1016/j.tetasy.2017.05.001
                                    
                                    
                                        日期:2017.6
                                    
                                    A series of novel oxazoline-substituted imidazolium salts with planar and central chirality has been successfully synthesized and applied to copper-catalyzed enantioselective 1,2-silylation of N-tosylaldimines. The oxazoline-carbene copper complex generated in situ by the reaction of the oxazoline-substituted imidazolium and Cu2O demonstrated an exceptionally high catalytic activity in the asymmetric 1,2-silylation of N-tosylaldimines, affording chiral alpha-amino silanes with excellent yields and enantioselectivities. (C) 2017 Elsevier Ltd. All rights reserved.