To a 50 mL round bottom flask, tert-butyl (5-(7-(4-(cyclopropylcarbamoyl)phenyl)-4-morpholinopyrido[3,2-d]pyrimidin-2-yl)pyrimidin-2-yl)carbamate (0.1 g, 0.00018 mol) and DCM (10 mL) were added. To the same reaction flask, TFA (0.055 mL, 0.00072 mol) was added and the reaction mixture was stirred at room temperature for 12 hours. The volatiles were evaporated under reduced pressure to provide crude residue. The residue was dissolved in 10% methanol in chloroform, washed with saturated sodium bicarbonate solution, brine, dried over sodium sulfate and evaporated under reduced pressure to provide the crude product. The crude product was purified by flash column chromatography (3-4% methanol in chloroform) to provide the title compound (0.016 g, 12%). 1H NMR (400 MHz, DMSO-d6): δ 9.19 (br s, 2H), 9.12 (d, J=1.6 Hz, 1H), 8.58 (d, J=4.0 Hz, 1H), 8.43 (d, J=1.6 Hz, 1H), 8.07 (d, J=8.4 Hz, 2H), 8.00 (d, J=8.4 Hz, 2H), 7.22 (br s, 2H), 4.52 (br s, 4H), 3.83 (s, 4H), 2.93-2.86 (m, 1H), 0.72 (d, J=5.2 Hz, 2H), 0.61 (d, J=2.4 Hz, 2H): LC-MS (ESI): Calculated mass: 468.2; Observed mass [M+H]+: 469.0. (RT=0.19 min).
