Novel heterocyclic compounds as antiallergic agents

摘要

There are disclosed compounds of the formula <IMAGE> wherein W is <IMAGE> or -N-; X is -O-, -S-, <IMAGE> Y is -CH2O-, -OCH2-, -CH2S-, -SCH2-, <IMAGE> +TR <IMAGE> n is 0-3; R1 is hydrogen, loweralkyl, loweralkoxy or halo; R2 is hydrogen or loweralkyl; and the pharmaceutically acceptable salts thereof, and their use in the treatment of leukotriene-mediated naso-bronchial obstructive airpassageway conditions, such as allergic rhinitis, allergic bronchial asthma and the like.