Acid activation of (H<sup>+</sup>–K<sup>+</sup>)-ATPase inhibiting 2-(2-pyridylmethyl-sulphinyl)benzimidazoles: isolation and characterization of the thiophilic ‘active principle’ and its reactions
2-(2-Pyridylmethylsulphinyl)benzimidazoles rearrange in acid to thiophilic benzimidazo[1,2-b]pyrido[1,2-d][1,2,4]thiadiazinium salts which react with 2-mercaptoethanol forming 2-pyridinio-benzimidazolides.
(H+-K+)-ATPase inhibiting 2-[(2-pyridylmethyl)sulfinyl]benzimidazoles. 1. Their reaction with thiols under acidic conditions. Disulfide containing 2-pyridiniobenzimidazolides as mimics for the inhibited enzyme