A mixture of 2-{[5-chloro-2-(trifluoromethyl)pyridin-3-yl]amino}-9-(trifluoromethyl)-5,7-dihydro-6H-pyrimido[5,4-d][1]benzazepin-6-one (0.058 g, 0.12 mmol), propargyl(dimethylamine) (0.016 mL, 0.15 mmol) and cesium carbonate (0.080 g, 0.25 mmol) in DMF (0.60 ml) was degassed for 15 min with argon. To the suspension were added bis(acetonitrile)palladium(II) chloride (0.0020 g, 0.0061 mmol) and Xphos (0.0076 g, 0.016 mmol). The suspension was purged three times with nitrogen and was then allowed to stir at 150° C. for 48 h. The mixture was filtered through celite and the filtrate was concentrated. The residue was purified by column chromatography to give 2-{[5-[3-(dimethylamino)prop-1-yn-1-yl]-2-(trifluoromethyl)pyridin-3-yl]amino}-9-(trifluoromethyl)-5,7-dihydro-6H-pyrimido[5,4-d][1]benzazepin-6-one (0.042 g, 66%) as a solid.
