Chiral Phosphine Catalyzed Asymmetric Michael Addition of Oxindoles
作者:Fangrui Zhong、Xiaowei Dou、Xiaoyu Han、Weijun Yao、Qiang Zhu、Yuezhong Meng、Yixin Lu
DOI:10.1002/anie.201208285
日期:2013.1.14
Bifunctional phosphines derived from amino acids mediate the asymmetric Michaeladdition of 3‐substituted oxindoles to activated alkenes (see scheme). Biologically relevant chiral 3,3‐disubstitutedoxindoles were thus prepared in high yields and with excellent enantioselectivities from 3‐aryl‐ and 3‐alkyl‐substituted oxindoles and various activated alkenes.
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).