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A suspension of N-(4-(3-(2-methyl-9-(tetrahydro-2H-pyran-2-yl)-9H-purin-6-yl)pyridin-2-ylamino)phenyl)cyclopropanecarboxamide (80 mg, 0.170 mmol) in DCM (3 mL) was cooled to 0° C. and treated with trifluoroacetic acid (3 mL, 40.4 mmol). 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-(4-(3-(2-methyl-9H-purin-6-yl)pyridin-2-ylamino)phenyl)cyclopropanecarboxamide (20 mg, 0.052 mmol, 30.5% yield) as a yellow solid. 1H NMR (400 MHz, d6-DMSO) δ 13.47-13.72 (m, 1H); 12.82 (s, 1H); 10.10 (s, 1H); 9.78 (s, 1H); 8.59 (s, 1H); 8.33 (d, J=3.20 Hz, 1H); 7.75 (d, J=76.46 Hz, 2H); 7.58 (d, J=8.53 Hz, 2H); 6.94-7.03 (m, 1H); 2.87 (s, 3H); 1.72-1.82 (m, 1H); 0.72-0.84 (m, 4H). m/z (ESI, +ve ion) 386 (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