Osmium tetroxide (290 μl, 0.04 mmol) was added to a flask containing N-(3-methyl-5-(1-(2-methylallyl)-1H-pyrazol-4-yl)phenyl)-4-(trifluoromethyl)pyrimidin-2-amine (56 mg, 0.15 mmol), N-methylmorpholine N-oxide (26.4 mg, 0.225 mmol), THF (1000 μL) and water (500 μL). The reaction mixture was stirred at room temperature for 3.5 hours. Silica was added and the mixture concentrated under reduced pressure. The residue was purified by column chromatography on silica (0-10% MeOH/DCM) and concentrated under reduced pressure. The racemic mixture was purified by chiral SFC (IA column, 40% MeOH with 0.25% DMEA/CO2) to afford 2-methyl-3-(4-(3-methyl-5-((4-(trifluoromethyl)pyrimidin-2-yl)amino)phenyl)-1H-pyrazol-1-yl)propane-1,2-diol (Example 21.1, Isomer 1, early eluting): MS ESI calcd. for C19H21F3N5O2 [M+H]+ 408. found 408, 1H NMR δ ppm (DMSO-d6): 10.11 (1H, s), 8.80 (1H, d, J=4.88 Hz), 7.95 (1H, s), 7.81 (1H, s), 7.73 (1H, s), 7.33 (1H, s), 7.24 (1H, d, J=4.88 Hz), 7.05 (1H, s), 4.80 (1H, t, J=5.61 Hz), 4.67 (1H, s), 4.11 (1H, d, J=13.94 Hz), 4.05 (1H, d, J=13.90 Hz), 3.18-3.20 (2H, m), 2.29 (3H, s), 0.95 (3H, s), and 2-methyl-3-(4-(3-methyl-5-((4-(trifluoromethyl)pyrimidin-2-yl)amino)phenyl)-1H-pyrazol-1-yl)propane-1,2-diol (Example 21.2, Isomer 2, late eluting): MS ESI calcd. for C19H21F3N5O2 [M+H]+ 408. found 408, 1H NMR δ ppm (DMSO-d6): 10.11 (1H, s), 8.80 (1H, d, J=4.88 Hz), 7.95 (1H, s), 7.81 (1H, s), 7.73 (1H, s), 7.33 (1H, s), 7.24 (1H, d, J=4.88 Hz), 7.05 (1H, s), 4.80 (1H, t, J=5.61 Hz), 4.67 (1H, s), 4.11 (1H, d, J=13.94 Hz), 4.05 (1H, d, J=13.90 Hz), 3.18-3.20 (2H, m), 2.29 (3H, s), 0.95 (3H, s).
