Metal-Free Synthesis of Indole via NIS-Mediated Cascade C–N Bond Formation/Aromatization

A novel rapid synthesis of indoles from N-Ts-2-alkenylanilines has been described; the reaction involves a NIS-mediated cascade C–N bond formation/aromatization, and a series of indoles with various functional groups have been synthesized in good to excellent yields under mild conditions without any other additives or catalysts.