Peracetic Acid → tert-butyl (3-(2-(methylsulfinyl)-7-oxopyrido[2,3-d]pyrimidin-8(7H)-yl)phenyl)carbamate

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At 0° C., a suspension of tert-butyl (3-(2-(methylthio)-7-oxopyrido[2,3-d]pyrimidin-8(7H)-yl)phenyl)carbamate (51) (3.57 g, 9.29 mmol) in DCM (80 mL) was treated with peracetic acid (32 wt % in AcOH, 1.95 mL, 9.29 mmol) slowly dropwise. After 5-10 min, the reaction mixture became a homogeneous yellow solution, and after 20 min, it became a suspension again. After 1 h, the reaction mixture was treated with DCM (50 mL) followed by a solution of aqueous sodium thiosulfate and stirred at 0° C. for 5 min. It was then treated with a saturated solution of NaHCO3, extracted with DCM (6×50 mL), dried over MgSO4, filtered and concentrated affording tert-butyl (3-(2-(methylsulfinyl)-7-oxopyrido[2,3-d]pyrimidin-8(7H)-yl)phenyl)carbamate (52) (2.50 g, 9.70 mmol, 67% yield) as a light yellow crystalline solid. The crude material was used without further purification. 1H NMR (400 MHz, DMSO-d6) δ ppm 9.58 (1H, s), 9.28 (1H, s), 8.18 (1H, d, J=9.6 Hz), 7.53 (1H, s), 7.37-7.47 (2H, m), 6.89-6.95 (2H, m), 2.71 (3H, s), 1.46 (9H, s). m/z (ESI, +ve ion) 422.9 (M+Na)+.

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