Hydrochloric Acid → 5-{[1-(N,N-dimethylglycyl)-5-(methyloxy)-2,3-dihydro-1H-indol-6-yl]amino}-8,10-difluoro-3-[(4-methylphenyl)sulfonyl]pyrrolo[2',3':4,5]pyrimido[6,1-b]quinazolin-7(3H)-one

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To a suspension of 2-({2-chloro-7-[(4-methylphenyl)sulfonyl]-7H-pyrrolo[2,3-d]pyrimidin-4-yl}amino)-4,6-difluorobenzamide (1.96 g, 4.1 mmol) in 2,2,2-trifluoroethanol (40 mL) was added 1-[(dimethylamino)acetyl]-5-(methyloxy)-2,3-dihydro-1H-indol-6-amine (1.33 g, 5.33 mmol), hydrochloric acid as a 4.0M solution in dioxane (4.1 mL), and catalytic potassium iodide (<10 mg). The resulting slurry was stirred at 90° C. in a pressure vial for 40 hours, at which time all solids had completely dissolved. The resulting solution was cooled to room temperature and diluted with dichloromethane and saturated sodium bicarbonate as to adjust the aqueous layer to pH>10. The organic layer was washed with water and saturated brine solution and dried over sodium sulfate. Solvents were removed under reduced pressure to afford a yellow solid that was purified via trituration from diethyl ether to afford 5-{[1-(N,N-dimethylglycyl)-5-(methyloxy)-2,3-dihydro-1H-indol-6-yl]amino}-8,10-difluoro-3-[(4-methylphenyl)sulfonyl]pyrrolo[2′,3′:4,5]pyrimido[6,1-b]quinazolin-7(3H)-one (2.63 g, 3.90 mmol) as a yellow solid. (ESIMS (M+H)+=675)

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