Ethyl 4-(bromomethyl)-3-(4-methoxyphenyl)-7-(pivaloyloxy)isoxazolo[4,5-c]pyridine-6-carboxylate (34 mg, 0.069 mmol) and pyrazole (9.4 mg, 0.138 mmol) were added to 1 mL of toluene, and the mixture was stirred at room temperature for 48 h. An additional equiv. of pyrazole was added, and the mixture was stirred at room temperature for 16 h and then at 45° C. for 16 h. The mixture was diluted with EtOAc (20 mL) and washed with 1M hydrochloric acid. The organic layer was dried over MgSO4 and concentrated, and the residue was purified by flash chromatography (0-100% EtOAc/hexanes) to give 19 mg of the title compound. MS: (+) m/z 395.29 (M+1).
