A mixture of potassium carbonate (1.08 g, 7.82 mmol), 3-(2-(4-methylthiazol-2-ylamino)pyridin-4-ylthio)phenol (0.274 g, 0.869 mmol), and tert-butyl 2-bromoacetate (0.169 g, 0.869 mmol) in DMF (5 mL). The reaction mixture was stirred at room temperature overnight, then diluted with water and extracted with ethyl acetate. The combined organic layers were dried over magnesium sulfate, filtered and concentrated. The residue was purified using prepacked silica gel column chromatography with 15-20% ethyl acetate to afford the desired product (0.224 g, 58.8% yield) as light yellow solid. 1H NMR (CDCl3) δ 8.08 (d, 1H), 7.33 (t, 1H), 7.15 (m, 1H), 7.04 (t, 1H), 6.98 (m, 1H), 6.57 (dd, 1H), 6.49 (dd, 1H), 6.33 (d, 1H), 4.50 (s, 2H, 2.22 (d, 3H), 1.46 (s, 9H); Mass spectrum (esi) m/z=430 (100)(M+H).
