To a solution of ethyl 2-(2-(1-tert-butyl-5-(4-fluorophenyl)-1H-pyrazol-4-yl)thiazol-4-yl)acetate (50 mg, 0.13 mmol) in DMF (2.0 mL) was added sodium hydride (60 wt % oil 6.19 mg, 0.15 mmol) at 0° C., and the mixture was stirred at room temperature for 15 min. To the reaction mixture was added benzyl bromide (0.018 mL, 0.15 mmol) at 0° C., and the mixture was stirred at room temperature for 4 hr. Water was added to the reaction mixture, and the mixture was extracted with ethyl acetate. The organic layer was washed with saturated brine and dried, and the solvent was evaporated under reduced pressure. The obtained residue was purified by silica gel column chromatography (solvent gradient; 0→10% ethyl acetate/hexane) to give ethyl 2-(2-(1-(tert-butyl)-5-(4-fluorophenyl)-1H-pyrazol-4-yl)thiazol-4-yl)-3-phenylpropanoate (15.9 mg, 0.033 mmol, 25.8%) as a colorless oil.
