Sodium hydride → (S)-3-((2,2-Dimethyl-1,3-dioxolan-4-yl)methyl)-5-(2-fluoro-4-iodophenylamino)-8-methylpyrido[2,3-d]pyrimidine-4,7(3H,8H)-dione

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Sodium hydride (89 mg, 4.7 mmol, 5 eq) was stirred in anhydrous DMF (1 mL) for 10 minutes. 5-(2-Fluoro-4-iodophenylamino)-6,8-dimethylpyrido[2,3-d]pyrimidine-4,7(3H,8H)-dione (400 mg, 0.94 mmol, 1 eq) in anhydrous DMF (400 μL) was added and the mixture stirred for 10 minutes. (R)-4-(Chloromethyl)-2,2-dimethyl-1,3-dioxolane (260 μl, 1.88 mmol, 2 eq) was added and the mixture subjected to microwave irradiation at 150° C. for 35 minutes. The solvent was removed in vacuo and the residue purified by HPLC. 1H NMR (400 MHz, MeOD) δ ppm 1.37 (s, 3H) 1.47 (s, 3H) 3.70 (s, 3H) 3.85 (dd, J=8.97, 5.68 Hz, 1H) 4.13 (dd, J=13.89, 7.07 Hz, 1H) 4.20 (dd, J=8.72, 6.69 Hz, 1H) 4.38 (dd, J=13.89, 3.03 Hz, 1H) 4.50-4.59 (m, 1H) 5.81 (s, 1H) 7.36 (t, J=8.21 Hz, 1H) 7.62-7.74 (m, 2H) 8.49 (s, 1H). [M+H] calc'd for C20H20FIN4O4, 527. found, 527.

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