Asymmetric Hydrogenation of Enamides, α-Enol and α-Enamido Ester Phosphonates Catalyzed by IndolPhos-Rh Complexes
摘要:
The scope of the IndolPhos-Rh-catalyzed asymmetric hydrogenation of enamides, alpha-enol and alpha-enamido ester phosphonates, hits been investigated. In addition, Taddol-based IndolPhos ligands are introduced. High activities and good to excellent enantioselectivities up to 99% ee are obtained fora broad range of structurally diverse substrates, giving important chiral products such as alpha, beta(2), and beta(3) amino acid derivatives, arylamines, and amino and hydroxy phosphonates.
Asymmetric Synthesis of the Roche Ester and its Derivatives by Rhodium‐INDOLPHOS‐Catalyzed Hydrogenation
作者:Jeroen Wassenaar、Mark Kuil、Joost N. H. Reek
DOI:10.1002/adsc.200800209
日期:2008.7.7
lpropionate, known as the Roche ester, and several of itsderivatives were successfully synthesized through asymmetric rhodium-catalyzed hydrogenation, using INDOLPHOS (diisopropyl1-[(S)-3,5-dioxa-4-phosphacyclohepta[2,1-a;3,4-a′]dinaphthalen-4-yl]-3-methyl-2-indolyl}phosphine) as the chiral ligand, in excellent yield and the highest ee reported up to now (TOF over 5500 h−1 at 25 °C; up to 98% ee
(S)-3-羟基-2-甲基丙酸酯(称为Roche酯)及其一些衍生物是使用INDOLPHOS(二异丙基1-[(S)-3,5- dioxa)通过不对称铑催化的氢化反应成功合成的作为手性配体的-4-膦酰基环庚[[2,1- a ; 3,4- a' ]二萘基-4-基] -3-甲基-2-吲哚基}膦)具有优异的收率,据报道,最高ee现在(25°C下5500 h -1下的TOF ;-40°C下ee高达98%)。
INDOLPhos: novel hybrid phosphine-phosphoramidite ligands for asymmetric hydrogenation and hydroformylation
作者:Jeroen Wassenaar、Joost N. H. Reek
DOI:10.1039/b709956h
日期:——
Hybrid bidentate phosphine-phosphoramiditeligands are prepared in a modular 2-step sequence and their rhodium complexes display high selectivity in rhodium catalysed hydrogenation and hydroformylation reactions.