Tert-butyl (6-(5-thiocyanatothiazol-2-ylamino)pyridin-3-yl)methylcarbamate (1.5 g, 4.13 mmol) was dissolved in methanol (30 mL) and treated with dithiothreitol (0.637 g, 4.13 mmol). The reaction was stirred at 23° C. for 1 hour. DMF (30 mL) was then added, followed by K3PO4 (0.351 g, 1.65 mmol) and methyl 4-chloro-3-fluoropicolinate (0.861 g, 4.53 mmol). The reaction was stirred at 23° C. for 1 hour, then methanol was evaporated. The title material was precipitated by adding water (˜200 mL), collected by filtration and dried under high vacuum to give the title material (1.875 g, 92%) as a solid. The compound was purified by silica gel chromatography (Biotage, dichloromethane/methanol) to give the title material as a solid. 1H NMR (400 MHz, DMSO-d6) δ ppm: 1.38 (9H, s) 3.91 (3H, s), 4.08 (2H, d, J=5.81 Hz), 7.09 (1H, d, J=8.34 Hz), 7.14 (1H, t, J=5.31 Hz), 7.41 (1H, t, J=5.94 Hz), 7.66 (1H, dd, J=8.46, 2.15 Hz), 7.82-7.85 (1H, m), 8.17 (1H, d, J=1.77 Hz), 8.33 (1H, d, J=5.05 Hz), 11.89 (1H, s). HPLC ret. time: 5.868 min. (Condition B).
