Synthesis of Enantioenriched 3‐Amino‐3‐Substituted Oxindoles by Stereoselective Mannich Reaction Catalyzed by Supported Bifunctional Thioureas.
作者:Patricia Rodríguez‐Ferrer、Miguel Sanz‐Novo、Alicia Maestro、José M. Andrés、Rafael Pedrosa
DOI:10.1002/adsc.201900414
日期:2019.8.5
Enantioenriched 3‐amino‐3‐substituted oxindoles have been obtained by addition of different nucleophiles to N‐Boc ketimines derived from isatin catalyzed by chiral bifunctional supported thioureas. The Mannich reaction occurs with excellent enantioselection, but poor diastereoselection when prochiral nucleophiles were used. The supported catalyst were recovered and reused for five times without loss
Synthesis of <i>N</i>-Alkoxycarbonyl Ketimines Derived from Isatins and Their Application in Enantioselective Synthesis of 3-Aminooxindoles
作者:Wenjin Yan、Dong Wang、Jingchao Feng、Peng Li、Depeng Zhao、Rui Wang
DOI:10.1021/ol3007953
日期:2012.5.18
A simple and generalmethod in the synthesis of N-alkoxycarbonyl ketimines derived from isatins has been described first. Generally, the enantioselective addition of 1,3-dicarbonyl compounds to this kind of ketimine affords chiral 3-amino oxindoles in high yield and excellent ee.
catalyzed by chiral Cinchona alkaloid based squaramide containing H-bond donor catalysts, wherein, the reaction of 1,3-diketones with isatin (N-Boc) ketimines led to the formation of 3-aminooxindole derivatives. These derivatives were obtained in high yields with excellent enantioselectivities under mild conditions using 3 mol% of the catalyst. This protocol provides valuable and easy access to chiral 3-substituted