To a nitrogen purged vial was added TBAF (0.249 mL, 0.249 mmol), 3-(2-(5-bromo-3-phenoxypyridin-2-ylamino)thiazol-4-yl)propanenitrile (0.200 g, 0.498 mmol) (Example 320), and TMSN3 (0.0992 mL, 0.748 mmol) were added, and the reaction was stirred at 120° C. for 24 Hr. The crude reaction mixture was dissolved in CH2Cl2 and washed with aqueous sodium bicarbonate solution. The organic layer was concentrated to a residue that was purified on silica gel by eluting with 7% MeOH/CH2Cl2 and further purified by triturating in refluxing EtOAc to give the title compound (0.128 g, 57.8% yield). 1H NMR (d6 DMSO) δ 3.03 (t, J=7.5 Hz, 2H), 3.25 (t, J=7.6 Hz, 2H), 6.70 (s, 1H), 7.13 (d, J=8.0 Hz, 2H), 7.22 (t, J=7.3 Hz, 1H), 7.38 (d, J=2.0 Hz, 1H), 7.45 (t, J=7.9 Hz, 2H), 8.22 (d, J=2.2 Hz, 1H), 11.01 (s, 1H).
