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
首先提出了以3-单取代的3-
氨基羟
吲哚为亲核体的季3-
氨基羟
吲哚的对映选择性合成。用双官能
硫脲-叔胺作为催化剂,开发了3-单取代的3-
氨基羟
吲哚与硝基烯烃的迈克尔加成反应,可得到一系列带有相邻季-叔中心的3,3-二取代的羟
吲哚,效果良好(高达98%) %收率,> 99:1 dr和92%ee)。我们还通过将产品转化为螺环氧
吲哚化合物,证明了该方法的潜在合成实用性。