Synthesis of indoles from o,β-dinitrostyrenes via indium/acetic acid-mediated Reductive heterocyclizations
Reductive heterocyclization reactions of various 1-nitro-2-(2-nitroaryl) ethenes to indoles were investigated. In the presence of indium/AcOH in toluene or benzene, 1-nitro-2-(2-nitroaryl)ethenes were cyclized to give corresponding indoles in good yields.