catalyst prepared from easily available chiral amino acids was evaluated in a model reaction betweenoxindole and methyl vinyl ketone, and the catalyst derived from isoleucine was found to be the best. Michaeladditions of 3‐monosubstituted oxindoles to methyl vinyl ketone, acrolein or propargyl aldehyde proceeded smoothly to afford 3,3‐disubstitutedoxindoles in good to excellent yields with moderate
Nickel(II)-Catalyzed Asymmetric Michael Addition of Oxindoles with Modified N,N,O-Tridentate Chiral Phenanthroline Ligands
作者:Yuki Naganawa、Hisao Nishiyama、Hiroki Abe
DOI:10.1055/s-0035-1561630
日期:——
Nickel(II)-catalyzed enantioselective Michael addition of N-Boc-oxindole derivatives with methyl vinyl ketone was demonstrated to give the corresponding adducts having chiral all-carbon quaternary centers with up to 87% ee in the presence of axially chiral N,N,O-tridentate phenanthroline ligand.
在轴向手性 N,N 存在下,镍 (II) 催化的 N-Boc-羟吲哚衍生物与甲基乙烯基酮的对映选择性迈克尔加成得到相应的加合物,其具有高达 87% 的 ee 手性全碳季中心, O-三齿菲咯啉配体。