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Enantioselective Synthesis of Quaternary 3-Aminooxindoles via Organocatalytic Asymmetric Michael Addition of 3-Monosubstituted 3-Aminooxindoles to Nitroolefins

The Journal of Organic ChemistryPublished 12 August 2013
Bao‐Dong Cui, Wen‐Yong Han, Zhijun Wu, Xiaomei Zhang, Wei‐Cheng Yuan
Citations61
SJR quartileQ2
SJR score0.74
SNIP0.86

TL;DR

The potential synthetic utility of the enantioselective synthesis of quaternary 3-aminooxindoles with 3-monosubstituted 3-AMinoox indoles as nucleophiles is demonstrated by a transformation of the product into a spirocyclic oxindole compound.

Abstract

An enantioselective synthesis of quaternary 3-aminooxindoles with 3-monosubstituted 3-aminooxindoles as nucleophiles is first presented. A Michael addition reaction of 3-monosubstituted 3-aminooxindoles to nitroolefins has been developed with a bifunctional thiourea-tertiary amine as a catalyst to afford a range of 3,3-disubstituted oxindoles bearing adjacent quaternary-tertiary centers in good results (up to 98% yield, >99:1 dr, and 92% ee). We also demonstrate the potential synthetic utility of this methodology by a transformation of the product into a spirocyclic oxindole compound.

Keywords

Chemistry