Acetic Acid → HCID 178488147, compound

Participants

Reaction Steps

0.35 g of 2-[[(3,5-dimethyl-4-methoxy-2-pyridinyl)methyl]thio]-5-methoxy-1H-benzimidazole was suspended in 5 ml of ethanol at room temperature. 0.035 g of Na2WO4·2H2O oxidation catalyst was dissolved in 0.099 g H2O2 (35% aqueous solution), and further diluted with 2 ml of water. The oxidant/catalyst solution was added to the reactant suspension dropwise so that the addition was completed in about 30 minutes while stirring at room temperature. The reaction was continued for additional 6 hours while stirring. 2 ml of 10% Na2S2O3 aqueous solution was then, added, and the resulting mixture was subjected to a reduced pressure to remove ethanol therefrom. Finally, a precipitate was formed after adding a diluted acetic acid aqueous solution to a pH value of about 8, which was filtered, water washed, and dried in vacuo to obtain Omeprazole with a yield of about 69% (LC purity>80%).

Provenance & Evidence