Branched Arylalkenes from Cinnamates: Selectivity Inversion in Heck Reactions by Carboxylates as Deciduous Directing Groups
作者:Jie Tang、Dagmar Hackenberger、Lukas J. Goossen
DOI:10.1002/anie.201605744
日期:2016.9.5
A decarboxylative Mizoroki–Heck coupling of aryl halides with cinnamic acids has been developed in which the carboxylate group directs the arylation into its β‐position before being tracelessly removed through protodecarboxylation. In the presence of a copper/palladium catalyst, both electron‐rich and electron‐deficient aryl bromides and chlorides bearing numerous functionalities were successfully
已开发出芳基卤化物与肉桂酸的脱羧Mizoroki-Heck偶联,其中羧酸酯基团将芳基化反应引导至其β位置,然后通过原脱羧作用被无痕清除。在铜/钯催化剂的存在下,具有多种功能的富电子和贫电子的芳基溴化物和氯化物已与广泛使用的肉桂酸酯成功偶联,并选择性地形成了1,1-二取代的烯烃。该反应概念(其中羧酸盐充当落叶导向基团)理想地补充了苯乙烯的传统1,2-选择性Heck反应。