To a mixture of ethyl 2-(2-acetamidopyridin-4-yl)-4-bromothiazole-5-carboxylate (190 mg, 0.510 mmol) and bis(tri-t-butylphosphine)palladium(0) (65.6 mg, 0.128 mmol) under nitrogen was added a 0.500 M solution of 2-napthylmethylzinc bromide in THF (3.60 mL, 1.80 mmol). The reaction was stirred at room temperature for 5 minutes, then at 60 degrees for 1 hour. Another portion of bis(tri-t-butylphosphine)palladium(0) (60.0 mg, 0.117 mmol) was added, followed by another portion of 0.500 M solution of 2-napthylmethylzinc bromide in THF (3.00 mL, 1.50 mmol), and the reaction was heated at 60 degrees for an additional 45 minutes. The reaction was cooled to room temperature and quenched with saturated ammonium chloride (10 mL). The mixture was extracted with ethyl acetate (2×20 mL) and the combined organic layers were dried over MgSO4, filtered, and concentrated in vacuo. The residue was purified by silica gel chromatography (ethyl acetate/hexane=0/100→100/0) to give 100 mg of the title compound. (40% yield). LC/MS (FA) ES+ 432.
