Enantioselective Friedel-Crafts Alkylation of Indoles with Alkylidene Malonates Catalyzed by<i>N,N′</i>-Dioxide-Scandium(III) Complexes: Asymmetric Synthesis of<i>β</i>-Carbolines
作者:Yanling Liu、Deju Shang、Xin Zhou、Xiaohua Liu、Xiaoming Feng
DOI:10.1002/chem.200802210
日期:2009.2.16
efficient catalytic asymmetric Friedel–Crafts alkylation of indoles with alkylidene malonates has been developed by using a chiral N,N′‐dioxide–Sc(OTf)3 complex as the catalyst (see scheme). Some optically active intermediates containing the indole skeleton have been synthesized, such as indolepropionic acid, tryptamines, and β‐carbolines. The coordination between the scandium atom and the chiral N,N′‐dioxide
通过使用手性N,N'-二氧化物-Sc(OTf)3络合物作为催化剂,开发了一种有效的亚吲哚丙二酸酯催化吲哚的不对称Friedel-Crafts烷基化反应(参见方案)。已经合成了一些含有吲哚骨架的旋光中间体,例如吲哚丙酸,色胺和β-咔啉。X射线结构分析揭示了atom原子与手性N,N'-二氧化物之间的配位关系。