Regio- and stereo-chemistry in allylation of aryl Grignard reagents catalyzed by phosphine-nickel and -palladium complexes
作者:Tamio Hayashi、Mitsuo Konishi、Kan-Ichi Yokota、Makoto Kumada
DOI:10.1016/0022-328x(85)87380-0
日期:1985.4
Nickel and palladium complexes with the 1,1′-bis(diphenylphosphino)ferrocene ligand effectively catalyze regioselective cross-coupling of allylic ethers such as 1- or 3-methyl-2-propenyl silyl ethers with aryl-Grignard reagents, where the nickel catalyst leads to carbon—carbon bond formation at the more substituted position while carbon–carbon bond formation occurs at the less substituted position
具有1,1'-双(二苯基膦基)二茂铁配体的镍和钯配合物可有效催化烯丙基醚(如1-或3-甲基-2-丙烯基甲硅烷基醚)与芳基-格利雅试剂的区域选择性交叉偶联,其中镍催化剂在钯催化剂的情况下,导致碳-碳键的形成在取代度较高的位置,而碳-碳键的形成在取代度较低的位置发生。顺式和反式的烯丙基化发现-5-甲基-2-环己烯基甲硅烷基醚与镍和钯催化剂一起进行构型转化。还研究了在膦配体存在下,(1-甲基-π-烯丙基)钯配合物与苯基格氏试剂的化学计量反应。提出了一种涉及形成π-烯丙基(芳基)ML 2中间体的机理。