Convenient synthesis of polysubstituted pyrroles and symmetrical and unsymmetrical bis-pyrroles catalyzed by H3PW12O40

A mild and environmentally-benign protocol for the synthesis of polysubstituted pyrroles, and symmetrical and unsymmetrical bis-pyrroles in the presence of H3PW12O40 as a non-corrosive, inexpensive and reusable catalyst under solvent-free conditions at room temperature is reported.