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
Asymmetric Michael addition reaction of 3-substituted-N-Boc oxindoles to activated terminal alkenes catalyzed by a bifunctional tertiary-amine thiourea catalyst
作者:Xin Li、Zhi-Guo Xi、Sanzhong Luo、Jin-Pei Cheng
DOI:10.1039/b918644a
日期:——
article reports an organocatalytic strategy for the asymmetric catalysis of chiral oxindoles bearing 3-position all-carbonquaternarystereocenters. Accordingly, highly enantioselectiveMichaeladdition reactions of 3-substituted oxindoles to terminal alkenes have been developed by utilizing a bifunctional tertiary-amine thiourea catalyst. The reactions accommodate a number of Michael donor compounds
Enantioselective Michael Addition of 3-Aryl-Substituted Oxindoles to Methyl Vinyl Ketone Catalyzed by a Binaphthyl-Modified Bifunctional Organocatalyst
作者:Hyun Joo Lee、Saet Byeol Woo、Dae Young Kim
DOI:10.3390/molecules17067523
日期:——
The enantioselectiveconjugateaddition reaction of 3-aryl-substituted oxindoles with methyl vinyl ketone promoted by binaphthyl-modified bifunctional organocatalysts was investigated. The corresponding Michael adducts, containing a quaternary center at the C3-position of the oxindoles, were generally obtained in high yields with excellent enantioselectivities (up to 91% ee).
Chiral Calcium VAPOL Phosphate Mediated Asymmetric Chlorination and Michael Reactions of 3-Substituted Oxindoles
作者:Wenhua Zheng、Zuhui Zhang、Matthew J. Kaplan、Jon C. Antilla
DOI:10.1021/ja109824x
日期:2011.3.16
We disclose a novel high yielding and highlyenantioselectivechiralcalciumVAPOL phosphate-catalyzed chlorination of 3-substituted oxindoles with N-chlorosuccinimide (NCS). The reaction conditions are also shown to be effective for the catalyticenantioselective Michael addition of 3-aryloxindoles to methyl vinyl ketone.
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。