Potassium Carbonate → 5,6-Dichloro-2-[[(4-methoxy-3-methyl-2-pyridyl)methyl]sulfinyl]benzimidazole

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Reaction Steps

A solution of 1.0 g of 5,6-dichloro-2-[[(4-methoxy-3-methyl-2-pyridyl)methyl]thio]benzimidazole in 150 ml of methylene chloride and 30 ml of methanol was treated with 0.5 g of potassium carbonate. 0.6 g of m-chloroperbenzoic acid was added thereto at -30° while stirring, whereupon the solution was stirred for an additional 5 minutes and subsequently poured into a mixture of 20 ml of saturated sodium bicarbonate solution and 20 ml of water. The separated organic phase was dried over sodium sulfate, treated with 0.5 ml of triethylamine and evaporated in a vacuum. Crystallization from methylene chloride-methanol-ether yielded 5,6-dichloro-2-[[(4-methoxy-3-methyl-2-pyridyl)methyl]sulfinyl]benzimidazole of melting point 173°.

Provenance & Evidence