Use of rhodium complexes with amphiphilic and nonamphiphilic ligands for the preparation of chiral α-aminophosphonic acid esters by hydrogenation in micellar media
Several kinds of micelle forming amphiphiles were tested in the asymmetric hydrogenation of the prochiral dialkyl 1-benzamido-2-phenyl-ethenephosphonates in aqueous media. The chiral catalytic system [Rh(cod)(2)]BF4/BPPM or amphiphilized PPM proved to be suitable for the hydrogenation reaction affording enantiomeric excesses up to 99%. A chiral induction is possible to a certain extent (up to 11% ee) by selected chiral amphiphiles in the presence of achiral rhodium catalysts. (C) 1998 Published by Elsevier Science Ltd. All rights reserved.
Synthesis of a New Class of Functionalized Chiral Bisphospholane Ligands and the Application in Enantioselective Hydrogenations
Asymmetric Hydrogenation of α- and β-Enamido Phosphonates: Rhodium(I)/Monodentate Phosphoramidite Catalyst
作者:Jinzhu Zhang、Yang Li、Zheng Wang、Kuiling Ding
DOI:10.1002/anie.201104912
日期:2011.12.2
High efficiency and enantioselectivity have been achieved in the RhI‐catalyzed asymmetrichydrogenation of α‐ and β‐enamido phosphonates using a monophosphoramidite as the chiral ligand (see scheme; cod=1,5‐cyclooctadiene), thus affording the optically active amino phosphonates with a turnover frequency of up to 1800 h−1 and high ee values.
使用单亚磷酰胺作为手性配体,在Rh I催化的α-和β-氨基膦酸酯的不对称氢化中实现了高效率和对映选择性(参见方案; cod = 1,5-环辛二烯),从而提供了光学活性的氨基膦酸酯具有高达1800 h -1的周转频率和高ee 值。
Catalytic stereoselective synthesis of α-Amino phosphonic acid derivatives by asymmetric hydrogenation
作者:Ute Schmidt、Günther Oehme、Hanswalter Krause
DOI:10.1080/00397919608086753
日期:1996.2
Abstract The phosphonate analogue of α-N-benzoyl protected phenylalanine methylester has been prepared by catalytic synthesis. Commonly used Rh-complexes has been applied in asymmetrichydrogenation to check their usefulness in the standard reaction.