Oxalyl chloride → 4-Chloro-2-(3,4,5-trifluorophenyl)butyryl chloride

oxalyl chloride (0.39 mL) and DMF (1 drop) were added to a solution of 4-chloro-2-(3,4,5-trifluorophenyl)butyric acid (730 mg) in methylene chloride (20 mL) at 0° C., and the reaction solution was stirred at room temperature for one hour. The reaction solution was concentrated under reduced pressure to obtain 4-chloro-2-(3,4,5-trifluorophenyl)butyric acid chloride. Triethylamine (4.1 mL), methylene chloride (20 mL) and DMF (5 mL) were added to a suspension of (E)-3-[3-methoxy-4-(4-methyl-1H-imidazol-1-yl)phenyl]acrylic acid hydrazide dihydrochloride (1.00 g) in THF (25 mL) at room temperature, and the reaction solution was stirred at room temperature for 10 minutes. A solution of 4-chloro-2-(3,4,5-trifluorophenyl)butyric acid chloride obtained above in THF (5 mL) was added to the reaction solution at 0° C., and the reaction solution was stirred at room temperature for one hour. The reaction solution was added to a saturated sodium bicarbonate solution, followed by extraction with ethyl acetate. The resulting extract was dried over magnesium sulfate and then concentrated under reduced pressure. The residue was purified by silica gel column chromatography (carrier: Chromatorex NH; elution solvent: ethyl acetate-methanol system) to obtain the title compound. The property value of the compound is as follows.