Directed regioselective Ni-catalyzed alkylation and hydride addition of allylic ethers. A remarkable turnover in regioselectivity
作者:James P. Morken、Mary T. Didiuk、Amir H. Hoveyda
DOI:10.1016/0040-4039(96)00660-0
日期:1996.5
Various allylicethers are reduced efficiently in the presence of Ni(PPh3)2Cl2 (5 mol%) and EtMgCl (5 equiv) with excellent regioselectivity (>99:1). The sense of regiochemical control in these reactions is opposite to that observed in Ni-catalyzed alkylations of the same substrates. A mechanistic working model that accounts for the observed levels and trends in selectivity is presented.