Aldol condensation between 3,4-dichlorobenzaldehyde (I) and 4'-hydroxyacetophenone (II) in hydroalcoholic NaOH yielded chalcone (III). Then, Mannich reaction of (III) with N,N-dimethylmethyleneammonium chloride (IV) in refluxing acetonitrile provided the bis(dimethylamino) compound as the dihydrochloride.