2-[(2-pyridylmethyl)sulfinyl]-1H-thieno[3,4-d]imidazoles. A novel class of gastric H+/K(+)-ATPase inhibitors

J Med Chem. 1992 Feb 7;35(3):438-50. doi: 10.1021/jm00081a004.


2-[(2-Pyridylmethyl)sulfinyl]thienoimidazoles were synthesized and investigated as potential inhibitors of gastric H+/K(+)-ATPase. The [3,4-d] isomers of the two possible thienoimidazole series were found to be potent inhibitors of gastric acid secretion in vitro and in vivo. Structure-activity relationships indicate that especially lipophilic alkoxy, benzyloxy, and phenoxy substituents with additional electron-demanding properties in the 4-position of the pyridine moiety combined with an unsubstituted thieno[3,4-d]imidazole lead to highly active compounds with a favorable chemical stability. Various substitution patterns in the thieno[3,4-d]imidazole moiety result in lower biological activity. The heptafluorobutyloxy derivative saviprazole (HOE 731, 5d) was selected for further development and is currently undergoing clinical evaluation. Comprehensive pharmacological studies indicate a pharmacodynamic profile different to omeprazole, the first H+/K(+)-ATPase blocker introduced on the market.

MeSH terms

  • Animals
  • Dogs
  • Enzyme Inhibitors / chemical synthesis
  • Enzyme Inhibitors / pharmacology
  • Female
  • Imidazoles / chemical synthesis*
  • Imidazoles / pharmacology
  • Male
  • Omeprazole / pharmacology
  • Rats
  • Rats, Inbred Strains
  • Sodium-Potassium-Exchanging ATPase / antagonists & inhibitors*
  • Stomach / enzymology*
  • Structure-Activity Relationship


  • Enzyme Inhibitors
  • Imidazoles
  • Sodium-Potassium-Exchanging ATPase
  • Omeprazole