Novel indolecarboxamidotetrazoles as potential antiallergy agents.
Unangst PC, Connor DT, Stabler SR, Weikert RJ, Carethers ME, Kennedy JA, Thueson DO, Chestnut JC, Adolphson RL, Conroy MC.
The synthesis and antiallergic potential of a series of novel indolecarboxamidotetrazoles are described. A number of compounds inhibit the release of histamine from anti-IgE-stimulated basophilic leukocytes obtained from allergic donors. Optimal inhibition is exhibited by compounds with 3-alkoxy, 5-methoxy, and 1-phenyl substituents on the indole core structure. Compound 8d (5-methoxy-3-(1-methylethoxy)-1-phenyl-N-1H-tetrazol-5-yl-1H -indole-2-carboxamide; designated CI-949) is a potent inhibitor of histamine release from human basophils and from guinea pig and human chopped lung.