Merging C–H Activation and Alkene Difunctionalization at Room Temperature: A Palladium-Catalyzed Divergent Synthesis of Indoles and Indolines
作者:Manash Kumar Manna、Asik Hossian、Ranjan Jana
DOI:10.1021/ol5036968
日期:2015.2.6
A palladium-catalyzed 1,2-carboamination through C–H activation at room temperature is reported for the synthesis of 2-arylindoles, and indolines from readily available, inexpensive aryl ureas and vinyl arenes. The reaction initiates with a urea-directed electrophilic ortho palladation, alkene insertion, and β-hydride elimination sequences to provide the Fujiwara–Moritani arylation product. Subsequently
据报道,在室温下通过C–H活化,钯催化的1,2-氨基甲酸酯化反应可合成2-芳基吲哚和二氢吲哚,这些化合物可从便宜的芳基脲和乙烯基芳烃中获得。该反应以尿素定向的亲电邻位palpalation,烯烃插入和β-氢化物消除序列开始,以提供Fujiwara-Moritani芳基化产物。随后,氮杂-瓦克环化和β-氢化物消除提供了高产率的2-芳基吲哚。截取常见的σ-烷基-Pd中间体,也可获得相应的二氢吲哚。二氢吲哚的形成归因于稳定的阳离子π-苄基-Pd物质的产生,可抑制β-氢化物的消除。