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A suspension of N-(5-methoxypyridin-3-yl)-3-(2-methyl-9-(tetrahydro-2H-pyran-2-yl)-9H-purin-6-yl)pyridin-2-amine (60 mg, 0.144 mmol) in DCM (3 mL) was cooled to 0° C., treated with trifluoroacetic acid (3 mL, 40.4 mmol), and the yellow solution was stirred at 0° C. for 1 h. The mixture was concentrated in vacuo, the residue was neutralized with 2 M NH3 in MeOH and then concentrated in vacuo. The crude product was purified by chromatography through a Redi-Sep pre-packed silica gel column (40 g) eluting with a gradient of 2% to 10% 2 M NH3-MeOH in DCM to give N-(5-methoxypyridin-3-yl)-3-(2-methyl-9H-purin-6-yl)pyridin-2-amine (30 mg, 0.090 mmol, 62.6% yield) as a yellow solid. 1H NMR (400 MHz, d6-DMSO) δ 13.66 (s, 1H); 13.09 (s, 1H); 9.84 (dd, J=7.82, 1.56 Hz, 1H); 8.63 (s, 1H); 8.46 (d, J=1.76 Hz, 1H); 8.41 (dd, J=4.69, 1.76 Hz, 1H); 8.20 (s, 1H); 7.95 (d, J=2.54 Hz, 1H); 7.10 (dd, J=7.82, 4.69 Hz, 1H); 3.87 (s, 3H); 2.89 (s, 3H). m/z (ESI, +ve ion) 334 (M+H)+.

1. concentrationThe mixture was concentrated in vacuo
2. concentrationconcentrated in vacuo
3. customThe crude product was purified by chromatography through a Redi-Sep pre-packed silica gel column (40 g)
4. washeluting with a gradient of 2% to 10% 2 M NH3-MeOH in DCM