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A series of novel alkylthioimidazo[1,2-b]pyridazines was synthesized and evaluated for ability to inhibit platelet activating factor (PAF)-induced bronchoconstriction in guinea pigs. Among them, 3-(imidazo[1,2-b]pyridazin-6-yl)thio-2,2-dimethylpropanesulfona mide (15) showed the most potent inhibitory effect. The structure-activity relationships in this series of compounds, in particular, the effects of conversion of the imidazopyridazine ring into other heterocyclic rings, introduction of a substituent group at the 2 or 3 position of the imidazopyridazine ring and introduction of a substituent group into the alkyl side chain, are also discussed.

chemical and pharmaceutical bulletin/chemical and pharmaceutical bulletin

Synthetic Studies on Condensed-Azole Derivatives. III. Synthesis and Anti-asthmatic Activities of C-Substituted Alkyl Side Chain Derivatives of .OMEGA.-Sulfamoylalkylthioimidazo(1,2-b)pyridazines and Related Compounds.