Ammonia → 2-(3-ethylsulfanyl-pyridin-2-yl)-1-methyl-5-pentafluoroethyl-1H-benzimidazole

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A mixture of 2-(3-ethylsulfanyl-pyridin-2-yl)-5-iodo-1-methyl-1H-benzimidazole (340 mg), copper iodide (410 mg), sodium pentafluoropropionate (800 mg), NMP (5 ml), and xylene (5 ml) was stirred at 160° C. for 5 hours. The reaction mixture was allowed to cool to room temperature, and then saturated aqueous sodium hydrogen carbonate solution and 28% ammonia solution were poured thereto. Then, the mixture was extracted with t-butylmethyl ether. The organic layer was dried over sodium sulfate, and concentrated under reduced pressure. The residue was subjected to silica gel column chromatography to give 2-(3-ethylsulfanyl-pyridin-2-yl)-1-methyl-5-pentafluoroethyl-1H-benzimidazole (240 mg), which is hereinafter referred to as “the present compound 26”.

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