Sodium Bicarbonate → ethyl 1-({4-[3-(3-amino-3-thioxopropyl)-5-(trifluoromethyl)phenyl]-1,3-thiazol-2-yl}methyl)-1H-pyrazole-4-carboxylate

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To a solution (13 mL) of the compound (2.8 g, 6.5 mmol) obtained in Example 96b in 4N hydrogen chloride ethyl acetate was added O,O-diethyl dithiophosphate (1.8 g, 9.7 mmol), and the mixture was stirred at room temperature overnight. The reaction mixture was neutralized with saturated aqueous sodium hydrogen carbonate, and the mixture was extracted with ethyl acetate. The obtained organic layer was washed with saturated brine, and dried over anhydrous sodium sulfate. The solvent was evaporated under reduced pressure. The resulting crude title compound was purified by column chromatography (hexane-hexane/ethyl acetate=50/50) to give the title compound (2.0 g, 66%) as a colorless amorphous form.

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