Stereo‐ and Regioselective Construction of Spirooxindoles Having Continuous Spiral Rings via Asymmetric [3+2] Cyclization of 3‐Isothiocyanato Oxindoles with Thioaurone Derivatives
作者:Hou‐Ze Gui、Zhe Meng、Zhan‐Shuai Xiao、Ze‐Ren Yang、Yin Wei、Min Shi
DOI:10.1002/ejoc.202001146
日期:2020.11.15
A highly efficient enantioselective [3+2] cyclization of 3‐isothiocyanato oxindoles with thioaurone derivatives was developed for the synthesis of spirooxindoles containing continuous spiral ring structures.
Dinuclear zinc-catalyzed enantioselective formal [3 + 2] cycloaddition of <i>N</i>-2,2,2-trifluoroethylisatin ketimines with low reactivity aurone derivatives
作者:Rui-Li Wang、Shi-Kun Jia、Ya-Jun Guo、Yang Yi、Yuan-Zhao Hua、Hui-Jie Lu、Min-Can Wang
DOI:10.1039/d1ob01599k
日期:——
Highly enantioselective formal [3 + 2] cycloaddition of N-2,2,2-trifluoroethylisatin ketimines with aurone derivatives of low reactivity using chiral dinuclear zinc catalysts has been developed via a Brønsted base and Lewis acid cooperative activation model. These transformations involving a domino Michael/Mannich reaction sequence led to efficient construction of a range of chiral spiro[benzofuran-pyrrolidine]