To a degassed solution of 5-ethoxymethoxy-benzofuran boronic acid (4) (140 mg, 0.593 mmol) in ethanol (10 mL), (6-bromo-2-nitro-pyridin-3-yl)-methyl-carbamic acid tert-butyl ester (7) (151 mg, 0.455 mmol), Pd(PPh3)2Cl2 (42 mg, 0.059 mmol) and Et3N (127 μL, 0.909 mmol) were added. The reaction mixture was stirred at 100° C. for 30 minutes in a microwave reactor. Volatiles were removed under reduced pressure. The residue was diluted with water (15 mL) and the mixture was extracted with ethyl acetate (3×50 mL). The combined organic extracts were washed with water, brine, dried over Na2SO4, and concentrated under reduced pressure. The crude product was purified by flash column chromatography using 20% ethyl acetate in hexane. Evaporation of solvent gave title compound 8 (170 mg) as a pale yellow solid.
