C2-Alkylation of N-pyrimidylindole with vinylsilane via cobalt-catalyzed C-H bond activation

Abstract

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 CoBr 2, 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. © 2012 Ding and Yoshikai; licensee Beilstein-Institut.