Group 5 Metal Binaphtholate Complexes for Catalytic Asymmetric Hydroaminoalkylation and Hydroamination/Cyclization
                                
                                    
                                        作者:Alexander L. Reznichenko、Thomas J. Emge、Stephan Audörsch、Eric G. Klauber、Kai C. Hultzsch、Bernd Schmidt                                    
                                    
                                        DOI:10.1021/om1011006
                                    
                                    
                                        日期:2011.3.14
                                    
                                    3,3'-Silylated binaphtholate tantalum and niobium complexes were shown to be efficient catalysts for the asymmetric hydroaminoalkylation of N-methylaniline derivatives and N-benzylmethylamine with simple alkenes in enantioselectivities of up to 80% ee. No hydroaminoalkylation was observed with aminoalkenes; rather, exclusive asymmetric hydroamination/cyclization took place in up to 81% ee.