In general, if the atoms that make up the ring contain heteroatoms, such rings become heterocycles, and organic compounds containing heterocycles are called heterocyclic compounds. An article called Evidence for acid-induced transformation of omeprazole into an active inhibitor of proton-potassium ATPase within the parietal cell, published in 1984, which mentions a compound: 73590-85-9, Name is 5-Methoxy-2-[[(4-methoxy-3,5-dimethyl-2-pyridyl)methyl]thio]benzimidazole, Molecular C17H19N3O2S, Recommanded Product: 73590-85-9.
The chem. reactions of omeprazole (I) [73590-58-6], leading to inhibition of gastric acid secretion, were investigated. In acid buffer solutions, omeprazole was found to be labile, whereas at physiol. pH it was stable (t1/2 > 17 h at pH 7.4). The stability of omeprazole was also studied in isolated, acid producing, gastric glands under conditions where acid formation was either stimulated or inhibited. The rate of transformation of omeprazole was high (t1/2 ≈ 3 min) under stimulation. Inhibition of acid formation in the gland greatly retarded the decomposition of omeprazole (t1/2 ≈ 73 min). The time-course for inhibition of acid formation by omeprazole was parallel to that for decomposition The major product formed from omeprazole was the reduced form, H 168/22 (II) [73590-85-9]. The inhibitory action of omeprazole was shown to depend on acid-induced transformation, since no inhibition was obtained when omeprazole was incubated under neutral conditions, both in the isolated gastric mucosal- and the (H+ + K+)-ATPase [9000-83-3] preparations Despite the fact that H 168/22 was the major product formed in the glandular preparation, it was found to be virtually inactive in both the glandular and (H+ and K+)-ATPase preparations Therefore, a model is proposed in which the inhibition of acid formation by omeprazole is mediated by a compound formed during the reduction of omeprazole to H 168/22 within the acid compartments of the parietal cell. Furthermore, mercaptans, such as β-mercaptoethanol, were found to prevent as well as reverse inhibition by omeprazole in both the glandular- and (H+ + K+)-ATPase preparations This indicates that -SH groups are most likely involved in the chem. reactions leading to inhibition of acid secretion.
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