[reaction: see text] Reaction of para-substituted anilines with styrene derivatives at elevated temperatures, when catalyzed by CF3SO3H, results in highly chemoselective ortho-alkylation of the aniline. When R = H, dialkylation can be achieved by varying the ratio of styrene to aniline. Several different substituted anilines and styrenes were examined, and good yields (42-87%) were obtained, except
[反应:见正文]当CF3SO3H催化时,对位取代的
苯胺与
苯乙烯衍
生物在高温下的反应导致
苯胺的高度
化学选择性邻烷基化。当R = H时,可以通过改变
苯乙烯与
苯胺的比例来实现二烷基化。除了在
苯乙烯上存在吸电子取代基的情况外,研究了几种不同的取代
苯胺和
苯乙烯,并获得了良好的收率(42-87%)。