Derivatives of benzimidazole (I), benzimidazolone (II), benzimidazolethione (III), 2,3-dihydroxyquinoxaline (IV) and the noncyclic acetamide (V) and trifluoroacetamide (VI) of the corresponding 1,2-phenylenediamine were synthesized and tested for DA-ergic activity. III and IV had a moderate affinity for the D2 receptors of the bovine caudate nucleus.