Ligand effects on dirhodium(II) carbene reactivities. Highly effective switching between competitive carbenoid transformations
作者:Albert Padwa、David J. Austin、Alan T. Price、Mark A. Semones、Michael P. Doyle、Marina N. Protopopova、William R. Winchester、Andrea Tran
DOI:10.1021/ja00072a021
日期:1993.9
Carboxylate and carboxamide ligands of dirhodium(II) catalysts control chemoselectivity in competitive metal carbene transformations of diazo compounds. For competitive intramolecular cyclopropanation versus intramolecular aromatic substitution with 1-diazo-3-aryl-5-hexen-2-ones, use of Rh 2 (OAc) 4 results in the products from both transformations in nearly equal amounts, but dirhodium(II) perfluorobutyrate
重氮化合物的竞争性金属卡宾转化中,二铑 (II) 催化剂的羧酸盐和羧酰胺配体控制化学选择性。对于竞争性分子内环丙烷化与用 1-重氮-3-芳基-5-己烯-2-酮进行分子内芳烃取代,使用 Rh 2 (OAc) 4 会导致两种转化的产物几乎相等,但二铑 (II)全氟丁酸盐 (Rh 2 (pfb) 4 ) 仅提供芳族取代产物,而己内酰胺二铑 (II) (Rh 2 (cap) 4 ) 仅提供环丙烷化产物