New homochiral phosphine ligands having a hexahydro-1H-pyrrolo[1,2-c]imidazolone backbone: preparation and use for palladium-catalyzed asymmetric alkylation of cycloalkenyl carbonates
作者:Kazutaka Shibatomi、Yasuhiro Uozumi
DOI:10.1016/s0957-4166(02)00467-6
日期:2002.8
New chiral ligands having a pyrrolo[1,2-c]imidazolone backbone were prepared by condensation of anilides of homochiral cyclic amino acids with 2-(diphenylphosphino)benzaldehyde. Of these ligands, (3R,9aS)-(3-(2-diphenylphosphino)phenyl-2-phenyl)tetrahydro-1H-imidazo[1,5-a]indole-1-one was found to be effective for palladium-catalyzed asymmetric allylic alkylation of cycloalkenyl carbonates with dimethyl malonate to give the corresponding dimethyl cycloalkenylmalonates with e.e. of up to 89%. (C) 2002 Elsevier Science Ltd. All rights reserved.