Organocatalytic stereoselective conjugate addition of 3-substituted oxindoles with in situ generated ortho-quinone methides
作者:Weihong Liang、Wenhao Yin、Tingzhong Wang、Fayang G. Qiu、Junling Zhao
DOI:10.1016/j.tetlet.2018.03.069
日期:2018.5
A novel method for the stereoselective conjugate addition of 3-substituted oxindoles to in situ generated o-QMs was described. This process was catalyzed efficiently by a cinchonidine-derived squaramide catalyst in oil-water phase, furnishing the corresponding 3,3-disubsituted oxindole derivatives in moderate to high yields (up to 98%) with high stereoselectivities (up to 95% ee, 15.4:1 dr). The utility
描述了一种将3-取代的羟吲哚立体选择性共轭加成到原位生成的o -QMs的新方法。该方法在油水相中由辛可尼定衍生的方酰胺催化剂有效地催化,以中等至高收率(高达98%)和高的立体选择性(高达95%ee,15.4)提供了相应的3,3-二取代的羟吲哚衍生物。 :1博士)。还通过克级合成和一种产物的衍生化研究了该反应的效用。