Synthetic applications of cyclobutanones other than ring expansion and fragmentation reactions are rare. Herein, highly efficient diastereo- and enantioselective organocatalytic Michael additions of 2-substituted cyclobutanone derivatives to nitroalkenes are reported allowing the stereocontrolled creation of ‘all-carbon’ quaternary centers. The approach relies on both the use of Brønsted base/hydrogen-bond
除环扩环和断裂反应外,
环丁酮的合成应用很少。在本文中,据报道2-硝基
环丁酮衍
生物向硝基烯烃的高效非对映和对映选择性有机催化迈克尔加成反应,从而允许立体控制生成“全碳”四元中心。该方法既依赖于布朗斯台德碱/氢键供体双功能有机催化剂的使用,也依赖于具有仲酰胺部分的
环丁酮的特定稳定和活化。发现该反应很好地适应了广泛范围的底物,从而允许控制多达三个连续的立体发生中心。这项工作开辟了新的综合机会。