A one-pot synthesis of 7-phenylindolo[3,2-a]carbazoles from indoles and β-nitrostyrenes, via an unprecedented reaction sequence
作者:Grégory Dupeyre、Pascale Lemoine、Nabila Ainseba、Sylvie Michel、Xavier Cachet
DOI:10.1039/c1ob06108a
日期:——
A six-step one-pot reaction was designed for synthesizing homodimeric 7-phenylindolo[3,2-a]carbazoles from 1H-indoles and β-nitrostyrenes, in the presence of SnCl2·2H2O. The reactions proceeded under very mild conditions and the desired heterocycles were obtained in moderate to good yields. An unprecedented mechanism involving sequential indole dimerization, regioselective nucleophilic conjugate addition of the resulting 2,3â²-biindole to β-nitrostyrene and formal intramolecular [4 + 2]-cycloaddition is proposed.
设计了一种六步一锅法反应,用于合成均相二聚体7-苯基吲哚[3,2-a]喹啉,该反应以1H-吲哚和β-硝基苯乙烯为原料,在SnCl2·2H2O的存在下进行。反应在非常温和的条件下进行,所需的杂环化合物以中等到良好的产率获得。提出了一种前所未有的机制,涉及顺序的吲哚二聚反应,结果生成的2,3'-双吲哚与β-硝基苯乙烯的区域选择性亲核加成,以及形式上的分子内[4 + 2]环加成。