Palladium (0) -catalyzed tandem cyclization of allenenes is described. Treatment of allenenes with an aryl halide, potassium carbonate. and catalytic [Pd(PPh3)(4)] in dioxane afforded tri- or tetracyclic heterocycles in moderate to good yields through insertion of arylpalladium(ii) halide into the allenic moiety, intramolecular carbopalladation, and aromatic C-H bond activation. The substituent on the olefin terminus has proven to be essential for the success of the tandem cyclization, The reaction with heterocyclic aryl halides such as iodopyrazine or 4-bromo-1-triethylindole afforded tri- or tetracyclic heteroaromatic products in good yields.