Synthesis of novel chiral binaphthyl phosphorus ligands and their applications in Rh-catalyzed asymmetric hydrogenation
作者:Yongxiang Chi、Xumu Zhang
DOI:10.1016/s0040-4039(02)00877-8
日期:2002.7
A series of new chiral mono- or bidentate phosphorus ligands were efficiently prepared through a key intermediate (S)-4-chloro-4,5-dihydro-3H-4-phosphacyclohepta[2,1-a;3,4-a′]binaphthalene and its derivatives. These ligands were applied in the Rh-catalyzed asymmetric hydrogenation of α-dehydro amino acids, enol acetates, itaconates, and enamides. Good to excellent enantioselectivities were obtained
通过关键中间体(S)-4-氯-4,5-二氢-3 H -4-磷酸环庚七[2,1- a ; 3,4- a ']双萘及其衍生物。这些配体用于α-脱氢氨基酸,烯醇乙酸酯,衣康酸酯和烯酰胺的Rh催化的不对称氢化。获得良好至优异的对映选择性(高达99.5%ee)。