Direct C2-alkylation of an indole bearing a readily removable N-pyrimidyl group with a vinylsilane was achieved by using a cobalt catalyst generated in situ from CoBr2, bathocuproine, and cyclohexylmagnesium bromide. The reaction allows coupling between a series of N-pyrimidylindoles and vinylsilanes at a mild reaction temperature of 60 °C, affording the corresponding alkylated indoles in moderate to good yields.
通过使用从CoBr2、bathocuproine和环己基溴化镁生成的钴催化剂,实现了含有易于去除的N-嘧啶基团的吲哚与乙烯硅烷的直接C2-烷基化。该反应允许在温和的反应温度60°C下,在一系列N-嘧啶基吲哚和乙烯硅烷之间进行偶联,得到相应的烷基化吲哚产物,收率在中等至良好之间。