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.
Synthesis of Chiral α-Aminoalkylpyrimidines Using an Enantioselective Three-Component Reaction
作者:Paul Knochel、Henry Dube、Nina Gommermann
DOI:10.1055/s-2004-829129
日期:——
A range of chiral α-aminoalkylpyrimidines has been prepared in a modular fashion in 5 steps with up to 98% ee. The key step is a CuBr-catalyzed enantioselective asymmetric three-component synthesis of propargylic amines.
Embodiments of the present disclosure provide for biaryl ligands (also referred to herein as "biaryl compound"), biaryl complexes, methods of making biaryl compounds, methods of making single enantiomers of these biaryl compounds, methods of use (e.g., catalysis) and the like.
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.
N,N-DIBENZYL-N-[1-CYCLOHEXYL-3-(TRIMETHYLSILYL)-2-PROPYNYL]-AMINE FROM CYCLOHEXANECARBALDEHYDE, TRIMETHYLSILYLACETYLENE AND DIBENZYLAMINE
作者:Gommermann, Nina、Knochel, Paul、Rech, Jason C.、Ellman, Jonathan A.