Et3B-Mediated radical alkylation of pyrroles and indoles

An efficient Et3B-mediated oxidative radical substitution of substituted pyrroles and indoles using xanthate based radical chemistry in the presence of iron(II) sulfate is described. Unsubstituted indole gave only low yield or failed in the process. 2-Cyanofuran and 2-benzoylthiophene did not afford the corresponding alkylated products under these conditions.