Dimethyl Sulfoxide → 2-(3-Fluoropyridin-4-yl)-5-(trifluoromethyl)benzothiazole

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A mixture of 2.3 g of 2-amino-4-(trifluoromethyl)-benzenethiol hydrochloride, 1.25 g of 3-fluoroisonicotinaldehyde, 1.29 g of N-ethyldiisopropylamine and 10 ml of DMSO was stirred for 5 hours at 170° C. The reaction mixture was cooled down to room temperature. To the reaction mixture was added water, and the resultant mixture was extracted with ethyl acetate twice. The combined organic layers were washed with water and saturated saline, dried over magnesium sulfate, then, concentrated under reduced pressure. The residue was subjected to silica gel column chromatography, to obtain 1.79 g of 2-(3-fluoropyridin-4-yl)-5-(trifluoromethyl)benzothiazole (hereinafter, referred to as the present compound 1).

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