<i>C</i><sub>1</sub>-Symmetric Rare-Earth-Metal Aminodiolate Complexes for Intra- and Intermolecular Asymmetric Hydroamination of Alkenes
作者:Alexander L. Reznichenko、Kai C. Hultzsch
DOI:10.1021/om3010614
日期:2013.3.11
are achieved with catalysts having a methyldiphenylsilyl substituent on the naphtholate moiety. Lanthanum aminodiolate catalysts generated in situ from [LaCH(C6H5)NMe2}3] did not exhibit improved catalytic activity in the intermolecular hydroamination in comparison to the corresponding yttrium and lutetium catalysts. The overall catalytic activities of the aminodiolate complexes are somewhat diminished
<i>C</i><sub>2</sub>-Symmetric Zirconium Bis(Amidate) Complexes with Enhanced Reactivity in Aminoalkene Hydroamination
作者:Alexander L. Reznichenko、Kai C. Hultzsch
DOI:10.1021/om9008907
日期:2010.1.11
Binaphthalenedicarboxamide zirconium complexes exhibit significantly enhanced catalytic activity in aminoalkenehydroamination reactions with respect to substrate scope (substrates without gem-dialkyl activation; cyclization of aminoheptenes), catalyst loading (as low as 0.5 mol %) and reaction temperatures (as low as 70 °C) compared to previous group 4 metal-based hydroamination catalyst systems.
Kinetic Resolution of Aminoalkenes by Asymmetric Hydroamination: A Mechanistic Study
作者:Alexanderâ L. Reznichenko、Frank Hampel、Kaiâ C. Hultzsch
DOI:10.1002/chem.200902229
日期:2009.11.23
complex for 1‐alkylaminopentenes diminishes resolution efficiency. Nevertheless, the relative cyclization rate for the two diastereomeric substrate–catalyst complexes remains in a typical range of 7–10:1. Plausible attractive π interactions between the aryl substituent and either the metal center or the aromatic system of the bis(triarylsilyl)‐substituted binaphtholate ligand may explain increased stability
Rare‐Earth‐Metal‐Catalyzed Kinetic Resolution of Chiral Aminoalkenes via Hydroamination: The Effect of the Silyl Substituent of the Binaphtholate Ligand on Resolution Efficiency
作者:Hiep N. Nguyen、Kai C. Hultzsch
DOI:10.1002/ejoc.201900107
日期:2019.4.24
The kinetic resolution of α‐substituted aminopentenes via intramolecular hydroamination was investigated using various 3,3′‐silyl‐substituted binaphtholate yttrium catalysts. High efficiencies in the kinetic resolution were observed for methyl‐, benzyl‐, and phenyl‐substituted substrates utilizing the cyclohexyldiphenylsilyl‐substituted catalyst 2c with resolution factors reaching as high as 90(5)