A solution of tert-butyl 3-(((trifluoromethyl)sulfonyl)oxy)-2,5-dihydro-1H-pyrrole-1-carboxylate (400 mg, 0.882 mmol) in THF (10 mL) was purged with N2 for 5 min and then was added potassium carbonate (610 mg, 4.41 mmol), 5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridin-2-amine (233 mg, 1.059 mmol), Pd(PPh3)4 (10.20 mg, 8.82 μmol) and water (0.1 mL). The reaction mixture was heated and stirred at 70° C. overnight. The reaction mixture was poured to saturated sodium bicarbonate solution and extracted with ethyl ether. The organic layer was separated, washed with brine, dried over sodium sulfate, filtered and evaporated. The crude product was purified by flash chromatography (0-10% MeOH/DCM) to yield the desired product (180 mg, 54.6%). LCMS (m/z): 262.2 (MH+), 0.598 min.
