Practical Highly Enantioselective Synthesis of Propargylamines through a Copper-Catalyzed One-Pot Three-Component Condensation Reaction
作者:Nina Gommermann、Paul Knochel
DOI:10.1002/chem.200501233
日期:2006.5.24
The one-potthree-componentreaction of terminal alkynes, aldehydes and secondary amines in the presence of copper(I) bromide/quinap is reported. The reaction scope has been determined and a broad variety of all three components has been used, which afforded the corresponding propargylamines in good to excellent yields and moderate to very good enantioselectivities. The reaction showed a strong positive
Design, Preparation, and Implementation of an Imidazole-Based Chiral Biaryl P,N-Ligand for Asymmetric Catalysis
作者:Flavio S. P. Cardoso、Khalil A. Abboud、Aaron Aponick
DOI:10.1021/ja407689a
日期:2013.10.2
A new strategy for increasing the barrier to rotation in biaryls has been developed that allows for the incorporation of 5-membered aromatic heterocycles into chiral atropisomers. Using this concept, an imidazole-based biaryl P,N-ligand has been designed and prepared as a single enantiomer. This ligand perfonns exceptionally well in the enantioselective A(3)-coupling, demonstrating the potential of this new design element.