Studies concerning pyrrolo[2, 1-a]phthalazines and related compounds

A series of pyrrolo2, 1-a]phthalazine derivatives has been prepared including examples carrying a variety of O- and N-substituents at position-6. A number of the products and related tricyclic structures show mild anti-hypertensive activity including 6-allyloxy-1, 2-dichloro-3-phenylpyrrolo2, 1-a]phthalazine.