Asymmetric Catalytic Intramolecular Hydroamination of Aminoallenes by Tantalum Amidoalkoxide Complexes
作者:Michelle C. Hansen、Carolyn A. Heusser、Tarun C. Narayan、Kristine E. Fong、Nagiko Hara、Alexander W. Kohn、Alexander R. Venning、Arnold L. Rheingold、Adam R. Johnson
DOI:10.1021/om200446v
日期:2011.9.12
monomeric with an approximate trigonal-bipyramidal geometry. The resulting complexes were examined for their in situ activity for catalytic asymmetric hydroamination/cyclization of an aminoallene. Enantioselectivities up to 80% ee were observed for the cyclization of 6-methylhepta-4,5-dienylamine to 2-(2-methylpropenyl)pyrrolidine at 135 °C with 5 mol % catalyst loading.