Compound 452 (22.36 g, 26.6 mmol), iodide 408 (7.904 g, 19.0 mmol), CsF (8.658 g, 57 mmol), NaHCO3 (4.788 g, 57 mmol) and Pd(PPh3)4 (2.195 g, 1.9 mmol) were combined with a mixture of H2O (25 mL) and DME (100 mL) which was with nitrogen for a half-an-hour and heated to reflux overnight. It was then was cooled to RT, diluted with EtOAc (200 ml), washed with aqueous NaHCO3 (50 mL) and brine (50 mL), and concentrated. The residue was purified by flash column chromatography (eluent pure EtOAc to 5% MeOH/EtOAc) followed by trituration with EtOAc/ether, to produce compound 453 as an off-white solid (5.4 g, 50% yield). LCMS: 565 (M+H)+.
