FIELD: organic chemistry, chemical technology, medicine, gastroenterology, pharmacy. SUBSTANCE: invention relates to a novel method for preparing omeprazole that is effective inhibitor of gastric acid secretion and useful as an anti-ulcerous agent. Invention describes method for preparing omeprazole including oxidation step of 5- methoxy-2-[[(4-methoxy-3,5-dimethyl-2-pyridinyl)methyl] thio]-1H-benzimidazole in organic solvent with an oxidizing agent and, possibly, in the presence of a base. Oxidation is carried out in the presence of titanium complex. Invention provides the development of novel, more suitable and effective method for preparing racemic omeprazole. EFFECT: improved preparing method. 10 cl, 2 ex
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