[EN] SPIRO-1,1'-BIINDANE-7,7-BISPHOSPHINE OXIDES AS HIGHLY ACTIVE SUPPORTING LIGANDS FOR PALLADIUM-CATALYZED ASYMMETRIC HECK REACTION [FR] OXYDES DE SPIRO-1,1'-BIINDANE-7,7-BISPHOSPHINE COMME LIGANDS DE SUPPORT HAUTEMENT ACTIFS POUR UNE RÉACTION DE HECK ASYMÉTRIQUE CATALYSÉE PAR DU PALLADIUM
Bisphosphine oxides formed highlyactiveasymmetric Heck catalysts, which were applied in asymmetricsynthesis of pharmacologically active azacycles. Olefin insertion proceeded via cis pathways, different from P,N-ligands.
novel, concise, and efficient enantioselectivesynthesis of (S)-preclamol (87% ee, 51% total yield) has been developed. The key steps of this synthetic approach included cobalt-catalyzed asymmetric catalytic cross-coupling of α-bromo ester with arylzinc and the reduction of chiral ester to diol with a tertiary carbon atom. Moreover, it was demonstrated that our enantioselective Negishi cross-coupling was
SPIRO-1,1'-BINDANE-7,7-BISPHOSPHINE OXIDES AS HIGHLY ACTIVE SUPPORTING LIGANDS FOR PALADIUM-CATALYZED ASYMMETRIC HECK REACTION
申请人:NANYANG TECHNOLOGICAL UNIVERSITY
公开号:US20160136629A1
公开(公告)日:2016-05-19
The present invention relates to catalyst complexes comprising palladium (Pd) and at least one spiro-1,1′-biindane-7,7′-bisphosphine oxide ligand as disclosed herein, and their use. The present invention is further directed to the asymmetric catalyzed covalent carbon-carbon single bond formation from aryl, heteroaryl and alkenyl triflates and halides and olefins utilising the said catalyst complexes.
Cobalt‐Catalyzed Asymmetric Sequential Hydroboration/Isomerization/Hydroboration of 2‐Aryl Vinylcyclopropanes
作者:Chenhui Chen、Hongliang Wang、Tongtong Li、Dongpo Lu、Jiajing Li、Xie Zhang、Xin Hong、Zhan Lu
DOI:10.1002/anie.202205619
日期:2022.7.25
Chiral 1,5-bis(boronates) were synthesized via an enantioselective cobalt-catalyzed sequential hydroboration/isomerization/hydroboration of vinylcyclopropanes through a trisubstituted alkene intermediate. These chiral 1,5-bis(boronates) were further converted into chiral 1,2,5-triaryl alkanes by an iterative Suzuki–Miyaura cross-coupling reaction with aryl halides.