BINOL derived monodentate acylphosphite ligands for homogeneously catalyzed enantioselective hydrogenation
摘要:
Enantiopure acylphosphites have been prepared based upon chiral nonsubstituted and 3,3'-disubstituted binaphthols in order to elucidate steric and electronic effects on the Rh(I)-catalyzed asymmetric hydrogenation of functionalized olefins. With these new types of ligands, up to 80% ee was obtained. Rate as well as enantio selectivity of the hydrogenation were strongly dependent on the precatalyst preparation and substitution pattern of the ligand. (C) 2004 Elsevier Ltd. All rights reserved.
Enantiopure acylphosphites have been prepared based upon chiral nonsubstituted and 3,3'-disubstituted binaphthols in order to elucidate steric and electronic effects on the Rh(I)-catalyzed asymmetric hydrogenation of functionalized olefins. With these new types of ligands, up to 80% ee was obtained. Rate as well as enantio selectivity of the hydrogenation were strongly dependent on the precatalyst preparation and substitution pattern of the ligand. (C) 2004 Elsevier Ltd. All rights reserved.