Acid-Catalyzed <i>ortho</i>-Alkylation of Anilines with Styrenes: An Improved Route to Chiral Anilines with Bulky Substituents
作者:Anna E. Cherian、Gregory J. Domski、Jeffrey M. Rose、Emil B. Lobkovsky、Geoffrey W. Coates
DOI:10.1021/ol051916j
日期:2005.11.1
[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%)。