The Asymmetric Aza-Claisen Rearrangement: Development of Widely Applicable Pentaphenylferrocenyl Palladacycle Catalysts
作者:Daniel F. Fischer、Assem Barakat、Zhuo-qun Xin、Matthias E. Weiss、René Peters
DOI:10.1002/chem.200900712
日期:2009.9.7
has a broader substrate tolerance than all previously known catalyst systems for asymmetric aza‐Claisen rearrangements. Our investigations also reveal that subtle changes can have a big impact on the activity. With the enhanced catalyst activity, the asymmetric aza‐Claisen rearrangement has a very broad scope: the methodology not only allows the formation of highly enantioenriched primary allylic amines
Optically pure chiral sulfoxides using ephedrine as a chiral auxiliary
作者:Scott C. Benson、John K. Snyder
DOI:10.1016/s0040-4039(00)79417-2
日期:1991.10
Optically pure chiral sulfoxides can be formed in good to excellent yields by sequential displacement reactions of organometallic reagents on the 1,2,3-oxathiazolidine-S-oxide formed from ephedrine and thionyl chloride, a modification of the Wudl and Lee procedure.
[EN] METHOD FOR THE PREPARATION OF AMINOPHOSPHINE LIGANDS AND THEIR USE IN METAL CATALYSTS<br/>[FR] PROCÉDÉ D'OBTENTION DE LIGANDS DE TYPE AMINOPHOSPHINE ET LEUR UTILISATION COMME CATALYSEURS MÉTALLIQUES
申请人:KANATA CHEMICAL TECHNOLOGIES I
公开号:WO2008148202A8
公开(公告)日:2009-07-23
Preparation and Diastereoselective <i>O</i><i>rtho</i>-Metalation of Chiral Ferrocenyl Imidazolines: Remarkable Influence of LDA as Metalation Additive
作者:René Peters、Daniel F. Fischer
DOI:10.1021/ol051437k
日期:2005.9.1
The preparation of optically pure ferrocenyl imidazolines starting from ferrocenecarboxylic acid and the application to diastereoselective ortho-metalations is described highlighting the remarkable influence of lithium dialkylamides, especially LDA, as metalation additives (in combination with tert-butyllithium) on the diastereoselectivity.
AMIDINE-CONTAINING COMPOUNDS USEFUL AS MUSCARINIC RECEPTOR ANTAGONISTS