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A suspension of 1-(5-(6-amino-2-methylpyrimidin-4-yl)-6-(5-fluoro-6-methoxypyridin-3-ylamino)pyridin-3-yl)ethanone (88 mg, 0.24 mmol) in 2 mL of THF at 0° C. was treated with methylmagnesium bromide (0.55 mL of 3.0 M solution in diethyl ether, 1.67 mmol). It was stirred at 0° C. for 15 min, and quenched with 5 mL of sat. NH4Cl. The mixture was extracted with 2×15 mL of EtOAc. The organic extracts were dried and concentrated. The crude material was purified on a silica gel column and eluted with 20-70% EtOAc in DCM to give 2-(5-(6-amino-2-methylpyrimidin-4-yl)-6-(5-fluoro-6-methoxypyridin-3-ylamino)pyridin-3-yl)propan-2-ol (58 mg, 63% yield) as a yellow crystalline solid. 1H NMR (400 MHz, DMSO-d6) δ ppm 12.23 (s, 1H), 8.35 (m, 1H), 8.32 (d, J=2.2 Hz, 1H), 8.17 (m, 2H), 7.02 (br, 2H), 6.03 (s, 1H), 5.18 (s, 1H), 3.92 (s, 3H), 2.47 (s, 3H), 1.48 (s, 6H). m/z (ESI, positive ion) 385.2 (M+H)+.

1. customquenched with 5 mL of sat. NH4Cl
2. extractionThe mixture was extracted with 2×15 mL of EtOAc
3. customThe organic extracts were dried
4. concentrationconcentrated
5. customThe crude material was purified on a silica gel column
6. washeluted with 20-70% EtOAc in DCM