View all references acidic clay,3 View all references Lewis acid,4 View all references inorganic salts,5 View all references and iodine6 View all references in organic solvent as promoters or catalysts in the conjugate addition reaction of indole and pyrrole to α,β??unsaturated ketones. Recently, aqueous organic reactions have received considerable attention in view of their synthetic efficiency and environmental friendliness.7 View all references The Michael addition ...