New Chiral Oxazoline-Phosphite Ligands for the Enantioselective Copper-Catalyzed 1,4-Addition of Organozinc Reagents to Enones
作者:Iris H Escher、Andreas Pfaltz
DOI:10.1016/s0040-4020(00)00143-5
日期:2000.4
A series of new P,N-ligands with a binaphthyl and an oxazoline moiety were prepared, which are efficient ligands for the enantioselective copper-catalyzed 1,4-addition of organozinc reagents to enones. Increasing the steric bulk in the 3,3′-position of binaphthyl from an H to a biphenylyl moiety improved the ee from 65 to 94% in the reaction of diethylzinc with cyclopentenone.
制备了一系列具有联萘基和恶唑啉部分的新的P,N-配体,它们是对映选择性铜催化的有机锌试剂向烯酮的1,4-加成反应的有效配体。在二乙基锌与环戊烯酮的反应中,将联萘的3,3'-位的空间体积从H增加到联苯基部分,可将ee从65%提高到94%。