To a solution of compound 274 (1 g, 1 eq.) and 2-(tributylstannyl)-4-methylthiazole (1.28 g, 1.2 eq.) in DMF (14 mL) were added PdCl2(PPh3)2 (193 mg, 10%) and potassium carbonate (455 mg, 1.2 eq.) and the resulting mixture was stirred at 90° C. overnight. DMF was concentrated under vacuum and water and dichloromethane were added. The aqueous layer was extracted with dichloromethane and the combined organic layers washed with water and brine, dried over Na2SO4, filtered, and concentrated. The residue was purified by chromatography on a silica gel to yield compound 275 as a white solid in 65% yield. 1H NMR (CDCl3, 400 MHz) δ (ppm) 2.57 (s, 3H), 3.86 (s, 3H), 4.06 (s, 3H), 5.33 (s, 2H), 6.98 (d, J=8.64 Hz, 2H), 7.08 (s, 1H), 7.25 (d, J=9.25 Hz, 1H), 7.46 (d, J=8.64 Hz, 2H), 7.74 (s, 1H), 8.12 (d, J=9.25 Hz, 1H); MS (ESI, EI+): m/z=427.1 (MH+).
