[EN] PRECATALYST FOR SHIBASAKI'S RARE EARTH METAL BINOLATE CATALYSTS<br/>[FR] PRÉ-CATALYSEUR POUR CATALYSEURS DE SHIBASAKI À BASE DE MÉTAL DE TERRE RARE-BINOLATE
申请人:UNIV PENNSYLVANIA
公开号:WO2014205437A1
公开(公告)日:2014-12-24
Disclosed herein are schemes for the synthesis of novel hydrogen-bonded rare earth- BINOLate precatalyst complexes, the precatalysts, per se, and their application for the generation of anhydrous REMB catalysts by cation-exchange from metal halides.
Catalytic conversion of conjugated enones into optically active α-keto aziridines using chiral rare earth metal complexes
作者:Hiroyasu Sugihara、Kazuhiro Daikai、Xiu Lan Jin、Hiroshi Furuno、Junji Inanaga
DOI:10.1016/s0040-4039(02)00361-1
日期:2002.4
Optically active N-unsubstituted α-keto aziridines 2 were synthesized from conjugatedenones 1 via the Sc[(R)-BNP]3-catalyzed enantioselective Michael addition of O-methylhydroxylamine followed by the La(O-i-Pr)3-catalyzed ring closure of the corresponding β-methoxyamino ketones 3. A remarkably high asymmetric amplification was observed during the Michael addition, and notable kinetic resolution was
PRECATALYST FOR SHIBASAKI'S RARE EARTH METAL BINOLATE CATALYSTS
申请人:THE TRUSTEES OF THE UNIVERSITY OF PENNSYLVANIA
公开号:US20160145273A1
公开(公告)日:2016-05-26
Disclosed herein are schemes for the synthesis of novel hydrogen-bonded rare earth-BINOLate precatalyst complexes, the precatalysts, per se, and their application for the generation of anhydrous REMB catalysts by cation-exchange from metal halides.
Chiral rare earth metal complex-catalyzed conjugate addition of O-alkylhydroxylamines. An efficient synthetic entry into optically active 2-acyl aziridines
作者:Xiu Lan Jin、Hiroyasu Sugihara、Kazuhiro Daikai、Hiroki Tateishi、Yong Zhi Jin、Hiroshi Furuno、Junji Inanaga
DOI:10.1016/s0040-4020(02)00983-3
日期:2002.10
Heterobimetallic Catalysis in Asymmetric 1,4-Addition of <i>O</i>-Alkylhydroxylamine to Enones
A heterobimetallic YLi3tris(binaphthoxide) catalyst (YLB) promoted a 1,4-addition of O-methylhydroxylamine in high enantiomeric excess (up to 97% ee). Catalyst loading was reduced to as little as 0.5 mol %, still affording the 1,4-adduct in 96% yield and 96% ee. A high concentration of substrates and the scalability of the present system is also practically useful. The results suggested that the heterobimetallic catalysis was not deactivated even in the presence of excess amine under highly concentrated conditions. A Y and Li bimetallic cooperative function was essential for a high catalyst turnover number.