Three-Component Ordered Annulation of Amines, Ketones, and Nitrovinylarenes: Access to Fused Pyrroles and Substituted Indoles under Metal-Free Conditions.

An efficient synthesis of pyrroles and indoles has been developed via three-component ordered annulation of amines, ketones, and nitrovinylarenes. The reaction selectivity can be well controlled under metal-free conditions to afford the corresponding heterocyclic products in good yields.