Organocatalytic Asymmetric Michael Addition of Oxindoles to Nitroolefins for the Synthesis of 2,2-Disubstituted Oxindoles Bearing Adjacent Quaternary and Tertiary Stereocenters
作者:Cheng-Yong Jin、Yao Wang、Yao-Zong Liu、Chao Shen、Peng-Fei Xu
DOI:10.1021/jo301886j
日期:2012.12.21
A bifunctional thiourea-catalyzed Michael addition of activated indolin-3-ones to nitroolefins has been developed. The synthetically useful 2,2-disubstituted indolin-3-one derivatives with vicinal chiral quaternary–tertiary stereocenters were obtained in high yields with excellent stereoselectivities. The adduct can be readily transformed into a structurally interesting heterocyclic architecture by
已经开发了双官能硫脲催化的活化的吲哚-3-酮的迈克尔加成到硝基烯烃上。具有邻位手性季-叔立体中心的合成有用的2,2-二取代的吲哚-3-酮衍生物以高产率获得,且具有优异的立体选择性。该加合物可以通过进一步的合成加工容易地转变成结构上令人感兴趣的杂环结构。