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A new series of 2-[(2-aminobenzyl, 4-aminobenzyl, and alpha-methylbenzyl) sulfinyl]-N-(4-pyridinyl)-3-pyridinecarboxamides. was synthesized and evaluated for gastric antisecretory activities. Several of the compounds synthesized exhibited potent inhibitory activities against [14C]aminopyrine accumulation stimulated by dibutyryl cyclic AMP in isolated rabbit parietal cells and histamine-induced gastric acid secretion in pylorus-ligated rats by intraduodenal administration. In particular, the more polar diastereoisomer of 2-[(4-methoxy-alpha-methylbenzyl)sulfinyl] -N-(4-pyridinyl)-3-pyridinecarboxamide (13b) showed in vivo inhibitory activity equivalent or superior to that of omeprazole and was a more selective (H+/K+)-ATPase inhibitor than omeprazole.

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Nicotinamide Derivatives as a New Class of Gastric (H+/K+)-ATPase Inhibitors. III. Synthesis and Gastric Antisecretory Activity of 2-((2- and 4-Aminobenzyl, and .ALPHA.-methylbenzyl)sulfinyl)-N-(4-pyridinyl)-3-pyridinecarboxamides.