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A suspension of 1-(5-(4-amino-6-methyl-1,3,5-triazin-2-yl)-6-(5-fluoro-6-methoxypyridin-3-ylamino)pyridin-3-yl)ethanone (140 mg, 0.38 mmol) in THF (2 mL) at 0° C. was treated with methylmagnesium bromide (1.9 mL of 1.4 M in toluene/THF=75/25, 2.65 mmol). The reaction mixture was stirred at 0° C. for 5 min followed by RT for 30 min and then quenched with sat. NH4Cl solution and extracted with EtOAc. The organic layer was concentrated and purified on a silica gel column eluting with 5-10% MeOH in DCM to give 2-(5-(4-amino-6-methyl-1,3,5-triazin-2-yl)-6-(5-fluoro-6-methoxypyridin-3-ylamino)pyridin-3-yl)propan-2-ol (50 mg, 34%) as a yellow crystalline solid. m/z (ESI, +ve ion) 386.0 (M+H)+. 1H NMR (400 MHz, d6-DMSO) δ 11.91 (br., 1H); 8.95 (d, J=2.6 Hz, 1H); 8.43-8.37 (m, 3H); 7.89 (s, 1H); 7.73 (s, 1H); 5.15 (s, 1H); 3.93 (s, 3H); 2.45 (s, 3H); 1.47 (s, 6H).

1. waitfollowed by RT for 30 min
2. customquenched with sat. NH4Cl solution
3. extractionextracted with EtOAc
4. concentrationThe organic layer was concentrated
5. custompurified on a silica gel column
6. washeluting with 5-10% MeOH in DCM