Indole cyanation via CH bond activation under catalysis of Ru(III)-exchanged NaY zeolite (RuY) as a recyclable catalyst

Selective 3-cyanation of indoles was achieved under heterogeneous catalysis of Ru(III)-exchanged NaY zeolite (RuY) as a recyclable catalyst, in combination with K4[Fe(CN)6] as a nontoxic, slow cyanide releasing agent. Under the aforementioned conditions, good yields of the desired products were obtained.