Group 5 Metal Binaphtholate Complexes for Catalytic Asymmetric Hydroaminoalkylation and Hydroamination/Cyclization
摘要:
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.
The Mechanism of Hydroaminoalkylation Catalyzed by Group 5 Metal Binaphtholate Complexes
作者:Alexander L. Reznichenko、Kai C. Hultzsch
DOI:10.1021/ja211945m
日期:2012.2.15
The intermolecular hydroaminoalkylation of unactivated alkenes and vinyl arenes with secondary amines occurs readily in the presence of tantalum and niobium binaphtholate catalysts with high regio- and enantioselectivity (up to 98% ee). Mechanistic studies have been conducted in order to determine the kinetic order of the reaction in all reagents and elucidate the rate- and stereodetermining steps
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.