Sodium Thiosulfate → 2-(5-ethylsulfonyl-1-methyl-3-trifluoromethyl-1H-pyrazol-4-yl)-3-methyl-6-trifluoromethyl-3H-imidazo[4,5-b]pyridine

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Reaction Steps

0.35 g of 3-chloroperoxybenzoic acid (purity of 65% or more) was added to a mixture of 0.24 g of 2-(5-ethylthio-1-methyl-3-trifluoromethyl-1H-pyrazol-4-yl)-3-methyl-6-trifluoromethyl-3H-imidazo[4,5-b]pyridine and 5 ml of chloroform, under ice cooling, and the mixture was stirred at room temperature for 6 hours. A 10% aqueous sodium thiosulfate solution was poured into the reaction mixture, and the mixture was extracted with chloroform. The organic layer was washed with a saturated aqueous sodium bicarbonate solution and dried over anhydrous magnesium sulfate, then concentrated under reduced pressure. The resulting residue was applied to a silica gel column chromatography to obtain 0.24 g of 2-(5-ethylsulfonyl-1-methyl-3-trifluoromethyl-1H-pyrazol-4-yl)-3-methyl-6-trifluoromethyl-3H-imidazo[4,5-b]pyridine (Compound of Present Invention (26)).

Provenance & Evidence