Diacetoxypalladium (8.44 mg, 0.04 mmol) was added to a stirred mixture of methyl 2-((R)-2-methylmorpholino)-4-oxo-8-(pyrrolidin-2-yl)-4H-chromene-6-carboxylate (0.35 g, 0.94 mmol), (9,9-dimethyl-9H-xanthene-4,5-diyl)bis(diphenylphosphine) (0.046 g, 0.08 mmol), 1-bromo-3-fluorobenzene (0.131 ml, 1.17 mmol) and cesium carbonate (0.459 g, 1.41 mmol) suspended in 1,4-dioxane (9 mL). The resulting suspension was degassed with argon and then stirred at 100° C. for 20 h. The reaction mixture was allowed to cool to room temperature, the insoluble were removed by filtration and the filtrate concentrated. The crude product was adsorbed on silica gel and purified by flash chromatography on silica gel eluting with 0 to 10% MeOH in EtAc. The solvents were evaporated to dryness to afford methyl 8-(1-(3-fluorophenyl)pyrrolidin-2-yl)-2-((R)-2-methylmorpholino)-4-oxo-4H-chromene-6-carboxylate (0.279 g, 64%) as a beige foam. Mass Spectrum: m/z [M+H]+=467.
