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The synthesis and gastric acid antisecretory properties of several N-substituted thieno[3,4-d]isothiazol-3-amine 1,1-dioxides and analogues are described. Two of the more potent compounds, N-[3-[3-(1-piperidinylmethyl)phenoxy]propyl]thieno[3,4-d] isothiazol-3-amine 1,1-dioxide (6a) and N-[4-[3-(1-piperidinylmethyl)phenoxy]propyl]thieno[3,4-d] isothiazol-3-amine 1,1-dioxide, showed greater potencies as H2-receptor antagonists (in vitro) than ranitidine. They also had potent gastric acid antisecretory activities in vivo, inhibiting basal acid secretion in the rat, histamine-stimulated acid secretion in the dog, and food-stimulated acid secretion in the dog. These were selected for further pharmacological evaluation.

Citation

A A Santilli, A C Scotese, R L Morris, G A Schiehser, D M Teller, S T Nielsen, D P Strike. Syntheses and gastric acid antisecretory properties of the H2-receptor antagonist. N-[3-[3-(1-piperidinylmethyl)phenoxy]propyl]thieno[3,4-d]isot hiazol-3-amine 1,1-dioxide and related derivatives. Journal of medicinal chemistry. 1988 Jul;31(7):1480-6

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PMID: 2898534

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