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0 °C

To a suspension of crude 5-[7-(3,3-difluorocyclobutyl)-2-(methylsulfanyl)-6,7-dihydro-5H-pyrrolo[2,3-d]pyrimidin-4-yl]pyrimidin-2-amine (˜80% purity) (768 mg, 2.63 mmol) in DCM (87 mL) at 0° C. was added m-chloroperbenzoic acid (844 mg, 3.42 mmol, 70% purity) in three portions over 1 min. The reaction mixture was stirred at 0° C. for 15 min, whereupon it was diluted with DCM and washed with saturated aqueous NaHCO3 and water. The organic layer was concentrated and purified via HPLC reversed phase column (0-50% of gradient A to B over 25 min; A: water with 0.1% acetic acid, B: acetonitrile with 0.1% acetic acid) to afford the title compound (251 mg, 26%). 1H NMR (400 MHz, DMSO-d6) δ 8.80 (s, 2 H), 7.19 (s, 2 H), 4.61-4.48 (m, 1 H), 3.83 (t, J=8.4 Hz, 2 H), 3.38-3.31 (m, 2 H), 3.14-2.98 (m, 2 H), 2.97-2.85 (m, 2 H), 2.83 (s, 3 H). m/z (APCI+) for C15H16F2N6OS 367.1 (M+H)+.

1. washwashed with saturated aqueous NaHCO3 and water
2. concentrationThe organic layer was concentrated
3. custompurified via HPLC
4. customover 25 min