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
Practical highly enantioselective synthesis of terminal propargylamines. An expeditious synthesis of (S)-(+)-coniine
作者:Nina Gommermann、Paul Knochel
DOI:10.1039/b409951f
日期:——
The one-pot three-component addition reaction of trimethylsilylacetylene, aldehydes and dibenzylamine provides in the presence of CuBr/Quinap as catalyst, various enantiomerically enriched propargylamines in good yields (up to 99%) and excellent enantiomeric excess (up to 98%
ee) which can be used as a key intermediate in the synthesis of the alkaloid (S)-(+)-coniine.
Preparation of functionalized primary chiral amines and amides via an enantioselective three-component synthesis of propargylamines
作者:Nina Gommermann、Paul Knochel
DOI:10.1016/j.tet.2005.08.064
日期:2005.11
functionalized primary chiral amines and amides from propargylamines has been developed. The chirality is established by an enantioselectivethree-component reaction of an aldehyde, a terminal alkyne and a secondary amine in the presence of copper(I) bromide/Quinap as the catalytic system leading to chiral propargylamines in high yields and enantioselectivities. Functionalization and reduction leads to various
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.