In order to study the effects of N-substituents of benzomorphans on antagonist-agonist activity we synthesized several benzomorphan derivatives having N-alkenyl, alkynyl, pyranyl or oxetanylmethyl groups. Reduction of N-(hepta-2, 5-diyn-4-yl) benzomorphan (13) with Lindlar catalyst resulted in dealkylation to afford normetazocine (1), whereas reduction with diisobutylaluminum hydride gave N-(hept-2-en-5-yn-4-yl) benzomorphan (17). N-Dihydro-(14) and tetrahydropyran derivatives (15) were obtained by the reaction of 1 with 4-methoxypyrylium salt followed by reduction with sodium borohydride.