Antiulcer Agents. II. Synthesis and Gastric Acid Antisecretory Activity of N-(3-{3-(Piperidinomethyl)phenoxy}propyl)-4-(1-methyl-1H-tetrazol-5-ylthio)butanamide and Related Compounds.
N-[3-3-(Piperidinomethyl)phenoxy}propyl]butanamides having a 1-methyl-1H-tetrazol-5-ylthio moiety as a pharmacophore and related compounds were prepared and tested for their antisecretory activity against histamine-induced gastric acid secretion in conscious rats with gastric fistulas. Most of the compounds showed antisecretory activity. Among them, N-[3-3-(piperidinomethyl)phenoxy}propyl]-4-(1-methyl-1H-tetrazol-5-ylthio)butanamide (5f) was found to possess the most potent activity, and a possibility of isosteric replacement of the methoxycarbonyl group with 1-methyl-1H-tetrazol-5-yl group was indicated. The structure-activity relationships are also discussed.
Di-2-methoxyethyl azodicarboxylate (DMEAD) is prepared in 65% yield in two steps as a crystalline solid. Use of DMEAD in the Mitsunobureaction of a variety of alcohols with pronucleophiles results in good yields of the products under sufficient stereospecificity of inversion, as conventional diisopropyl azodicarboxylate (DIAD) does. Isolation of the product is, however, much easier with DMEAD than