Ruthenium-catalyzed heteroannulation of anilines with alkanolammonium chlorides leading to indoles
作者:Chan Sik Cho、Jin Hwang Kim、Tae-Jeong Kim、Sang Chul Shim
DOI:10.1016/s0040-4020(01)00202-2
日期:2001.4
Anilines react with alkanolammonium chlorides in an aqueous medium (H2O–dioxane) at 180°C in the presence of a catalytic amount of a ruthenium catalyst together with SnCl2·2H2O to afford the corresponding indoles in moderate to good yields. Especially, when triisopropanolammonium chloride is employed to react with anilines, 2-methylindoles are formed regioselectively. The presence of SnCl2·2H2O is
在催化量的钌催化剂和SnCl 2 ·2H 2 O的存在下,苯胺在水性介质(H 2 O-二恶烷)中在180°C下与链烷醇氯化铵反应,以中等至良好的收率得到相应的吲哚。特别是,当使用氯化三异丙基丙铵与苯胺反应时,区域选择性地形成2-甲基吲哚。的SnCl存在2 ·2H 2 O为必需的有效形成吲哚。针对该催化过程,提出了一种涉及链烷醇基团从链烷醇胺转移至苯胺,苯胺被苯胺链烷醇进行N-烷基化以及1,2-二苯胺基烷烃的杂环化反应的反应途径。