Organolanthanide-Catalyzed Intramolecular Hydroamination/Cyclization/Bicyclization of Sterically Encumbered Substrates. Scope, Selectivity, and Catalyst Thermal Stability for Amine-Tethered Unactivated 1,2-Disubstituted Alkenes
作者:Jae-Sang Ryu、Tobin J. Marks、Frank E. McDonald
DOI:10.1021/jo035417c
日期:2004.2.1
R* = (−)-menthyl; Ln = Sm, Y), and [Me2Si(η5-Me4C5)(CpR*)]SmN(TMS)2 (Cp = η5-H3C5; R* = (−)-menthyl) mediate asymmetric intramolecular hydroamination/cyclization of amines bearing internal olefins and afford chiral 2-substituted piperidine and pyrrolidine in enantioselectivities as high as 84:16 er at 60 °C. The substrate of the structure NH2CH2CMe2CH2CHCH(CH2)2CHCH2 is regiospecifically bicyclized