CN1CCc2cccc(N)c2C1=O.Clc1cc(I)c(Cl)cn1>C1COCCO1.CC(=O)O.CC(=O)O.CC1(C)c2cccc(P(c3ccccc3)c3ccccc3)c2Oc2c(P(c3ccccc3)c3ccccc3)cccc21.O=C([O-])[O-].[Cs+].[Cs+].[Pd]>CN1CCc2cccc(Nc3cc(Cl)ncc3Cl)c2C1=Odiacetoxypalladium (0.573 g, 2.55 mmol) was added to a stirred suspension of 2,5-dichloro-4-iodopyridine (13.99 g, 51.07 mmol), 8-amino-2-methyl-3,4-dihydroisoquinolin-1(2H)-one (9 g, 51.07 mmol), (9,9-dimethyl-9H-xanthene-4,5-diyl)bis(diphenylphosphine) (2.96 g, 5.11 mmol) and cesium carbonate (24.96 g, 76.61 mmol) dissolved in 1,4-dioxane (300 mL). The resulting suspension was degassed (3 times) with nitrogen and was stirred at 100°C for 16 hours. The reaction mixture was allowed to cool to room temperature, diluted with DCM (100 mL) and filtered. The residue was washed with DCM. The filtrates was combined and evaporated to dryness. The crude product was purified by flash chromatography on silica gel eluting with 0 to 10% ethyl acetate in dichloromethane. The solvent was evaporated to dryness to afford 8-(2,5-dichloropyridin-4-ylamino)-2-methyl-3,4-dihydroisoquinolin-1(2H)-one (9.80 g, 59.6 %) as a clear white solid.
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