To a 25 mL pear flask was added tert-butyl ((S)-1-(5-((S)-1-((2-amino-5-cyano-6-methylpyrimidin-4-yl)amino)ethyl)-1-methyl-1H-pyrrolo[3,2-b]pyridin-6-yl)pyrrolidin-3-yl)(methyl)carbamate (61 mg, 0.121 mmol) in dichloromethane (0.8 mL) to give a solution. To this solution was added TFA (0.27 mL), and the mixture was stirred at room temperature for 18 hours. All the volatiles were removed in vacuo, and the residue was re-suspended in toluene and concentrated to remove residual TFA. The residue was then diluted in ACN and water (total of about 90 mL), followed by the addition of 2 N HCl (4 mL). The mixture was then lyophilized to give an HCl salt of the title compound as a yellow-green solid (41 mg, 84%). 1H NMR (400 MHz, DMSO-d6) δ ppm 1.66 (d, J=6.82 Hz, 2H), 2.17 (td, J=12.69, 7.20 Hz, 1H), 2.31-2.45 (m, 3H), 2.61 (s, 2H), 3.20-3.39 (m, 2H), 3.46 (br s, 1H), 3.57 (br s, 1H), 3.95 (s, 3H), 5.91 (t, J=6.95 Hz, 1H), 6.79 (br s, 1H), 7.68 (br s, 1H), 8.03 (br s, 1H), 8.48 (br s, 1H), 8.77 (br s, 1H), 9.32-9.50 (m, 1H), 9.60-9.82 (m, 1H); ESI-MS m/z [M+H]+ calc'd for C21H27N9, 406. found 406.
