To a round bottom flask is added 2-(2-amino-6-chloro-5-formyl-pyrimidin-4-ylamino)-N-(3-trifluoromethyl-phenyl)-acetamide (80.0 mg, 0.21 mmol, 1.0 eq.), THF (5.0 mL), and DIEA (0.036 mL, 0.21 mmol, 1.0 eq.). The flask was then cooled to 0° C. before adding sodium thiomethoxide (16.0 mg, 0.23 mmol, 1.1 eq.). The reaction was warmed to RT and stirred for 3 hrs before quenching with H2O (10 mL) and EtOAc (50 mL). The EtOAc layer washed with brine, dried with Na2SO4, and concentrated to give pure 2-(2-amino-5-formyl-6-methylsulfanyl-pyrimidin-4-ylamino)-N-(3-trifluoromethyl-phenyl)-acetamide as a yellow solid (75.0 mg, 92%). LC/MSD (HP Series 1100 MSD): Expected MW: 385, Observed M+H, 386.1, Retention time: 1.58 min. ANALYTICAL HPLC: >95%, Retention time: 4.30 min (8 minute run). 1H-NMR (d6-DMSO): 10.48 (s, 1H), 9.98 (s, 1H), 9.35 (t, 1H), 8.10 (s, 1H), 7.80 (d, 1H), 7.59 (t, 1H), 7.41 (m, 2H), 7.25 (br s, 1H), 4.25 (d, 2H), (3 thiomethyl protons are buried under DMSO peak) ppm. 1H-NMR (d-MeOH): 10.0 (s, 1H), 8.00 (s, 1H), 7.78 (d, 1H), 7.50 (t, 1H), 7.39 (d, 1H), 4.33 (s, 2H), 2.51 (s, 3H) ppm.
