Highly Modular Synthesis ofC1-Symmetric Aminosulfoximines and Their Use as Ligands in Copper-Catalyzed Asymmetric Mukaiyama-Aldol Reactions
作者:Martin Langner、Pauline Rémy、Carsten Bolm
DOI:10.1002/chem.200500497
日期:2005.10.21
The development of C1-symmetricaminosulfoximines, their highly modular synthesis, and their application in enantioselective copper-catalyzed Mukaiyama-type aldolreactions between pyruvates and enolsilanes is described. In this context, the influence of the ligand architecture as well as the optimization of the reaction conditions are discussed. In detail, the dependence of the catalyst efficiency
(1,2-Diaminoethane-1,2-diyl)bis(<i>N</i>-methylpyridinium) Salts as a Prospective Platform for Designing Recyclable Prolinamide-Based Organocatalysts
作者:Vladislav G. Lisnyak、Alexander S. Kucherenko、Edward F. Valeev、Sergei G. Zlotin
DOI:10.1021/acs.joc.5b01555
日期:2015.10.2
A new efficient and highly recyclable organocatalyst has been developed for asymmetric cross-aldolreactions under neat conditions in ketone–ketone, ketone–aldehyde, and aldehyde–aldehyde systems. The catalyst features two prolinamide fragments and a C2-symmetrical (1,2-diaminoethane-1,2-diyl)bis(N-methylpyridinium) group. The catalyst retained high activity and excellent stereoselection over the operating
C1-Symmetric Sulfoximines as Ligands in Copper-Catalyzed Asymmetric Mukaiyama-Type Aldol Reactions
作者:Martin Langner、Carsten Bolm
DOI:10.1002/anie.200460953
日期:2004.11.12
Asymmetric aldol reactions in ketone/ketone systems catalyzed by ionic liquid-supported C2-symmetrical organocatalyst
作者:Sergei V. Kochetkov、Alexander S. Kucherenko、Sergei G. Zlotin
DOI:10.1016/j.mencom.2015.05.002
日期:2015.5
Ionic liquid-supported (1,S,2S)- and (1R,2R)-1,2-bis[(S)-prolinamido]-1,2-diphenylethanes act as organocatalysts in asymmetric aldol reactions of acetone with a-keto esters or trifluoroacetophenone providing high yields and from moderate to high enantioselectivity. Recycling of the catalyst with a gradual decrease in conversion and ee values is possible.