描述 d'une procedure generale pour la synthese de biphenyles chiraux via取代芳香亲核试剂 d'un groupe o-methoxy par un reactif de Grignard 芳香 avec une oxazoline en tant qu'auxiliaire 手性。联苯外消旋化的测定
描述 d'une procedure generale pour la synthese de biphenyles chiraux via取代芳香亲核试剂 d'un groupe o-methoxy par un reactif de Grignard 芳香 avec une oxazoline en tant qu'auxiliaire 手性。联苯外消旋化的测定
Very often ligands are anionic or neutral species. Cationic ones are rare, and, when used, the positively charged groups are normally appended to the periphery of the ligand. Here, we describe a dicationic phosphine with no spacer between the phosphorus atom and the two positively charged groups. This structural feature makes its donor ability poorer than that of phosphites and only comparable to extremely
synthetic method that features the use of an organocatalyst as the key step was developed for the preparation of biaryl atropisomers. The first reaction is an asymmetric domino Michael–Henry reactioncatalyzed by diphenylprolinolsilylether to afford the substituted nitrocyclohexanecarbaldehyde with four stereogenic centers and one defined configuration of a stereogenic axis with excellent enantioselectivity
[EN] SYNTHESIS OF PHOSPHINE LIGANDS BEARING TUNABLE LINKAGE: METHODS OF THEIR USE IN CATALYSIS<br/>[FR] SYNTHÈSE DE LIGANDS DE PHOSPHINE PORTANT UNE LIAISON RÉGLABLE : PROCÉDÉS POUR LEUR UTILISATION DANS UNE CATALYSE
申请人:THE HONG KONG POLYTECHNIC UNIV SHENZHEN RESEARCH INSTITUTE
公开号:WO2017193288A1
公开(公告)日:2017-11-16
A series of novel linked indolyl phosphine ligands for transition metals, the synthesis thereof and their use in catalytic coupling reactions are provided. The ligands provide improvements of trasition-metal-catalyzed reactions, including the range of substrates scope, reaction conditions and efficieny.
Catalytic Atroposelective Aerobic Oxidation Approaches to Axially Chiral Molecules
作者:Lenin Kumar Verdhi、Asit Ghosh、Natalia Fridman、Alex M. Szpilman
DOI:10.1021/acs.joc.3c00417
日期:2023.7.7
copper and chiral nitroxide co-catalyzed aerobic enantioselective oxidation process has been developed that allows access to axially chiral molecules. Two complementary atroposelective approaches, oxidative kinetic resolution (OKR) and desymmetrization, were studied using ambient air as the stoichiometric terminal oxidant. OKR of rac-N-arylpyrrole alcohols and rac-biaryl alcohols affords the optically