Potassium hydroxy sulfite → N4-{2-[(1,1-Dioxido-4-thiomorpholinyl)carbonyl]phenyl}-5-fluoro-N2-{3-[2-(4-morpholinyl)ethyl]phenyl}-2,4-pyrimidinediamine

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5-fluoro-N2-{3-[2-(4-morpholinyl)ethyl]phenyl}-N4-[2-(4-thiomorpholinylcarbonyl)phenyl]-2,4-pyrimidinediamine (100 mg, 0.19 mmoles) was dissolved in 5 mL of THF and 5 mL of methanol, and treated with a solution of OXONE® reagent (15 equivalents) in 5 mL water. The system was stirred for 48 h at room temperature, and then filtered and concentrated to dryness. The residue was immobilized onto silica gel and purified by flash chromatography on silica gel, using a gradient of 100% A to 90% A-10% B, where “A” is chloroform and “B” is 10:90:1 methanol-chloroform-concentrated aqueous ammonium hydroxide). The title compound was isolated and characterized. MS: M(C27H31FN6O4S)=554.2, (M+H)+=555.

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