A practical benzannulation method to prepare variously substituted aryl amines and sulfides was developed. The approach involves a Michael-aldol reaction of β-keto sulfones with enones followed by a subsequent condensation of the initial adduct with various amines. The base-induced Michael-aldol cascade proceeds smoothly with a number of different β-keto sulfones, affording the adducts as single diastereomers
开发了一种实用的苯环烷基化方法,用于制备各种取代的芳基胺和
硫化物。该方法涉及β-酮砜与烯酮的迈克尔-醛醇缩合反应,然后随后将初始加合物与各种胺缩合。碱诱导的Michael-aldol级联反应可与许多不同的β-酮砜平稳地进行,从而提供了加合物形式的单一非对映异构体。将所得的迈克尔-醛醇缩合产物与胺在
甲苯中于120°C加热,会形成过渡烯胺,然后该胺发生苯基亚
磺酸损失,以高收率提供芳香化胺。当迈克尔-醛醇产物与
硫醇或醇一起加热时,也会发生相关反应,从而生成芳基取代的
硫化物或醚。