Triethylamine → (R)-3-(2,3-Dihydroxypropyl)-5-(4-ethynyl-2-fluorophenylamino)-6,8-dimethylpyrido[2,3-d]pyrimidine-4,7(3H,8H)-dione

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Reaction Steps

(R)-3-(2,3 Dihydroxypropyl)-5-(2-fluoro-4-iodophenylamino)-6,8-dimethylpyrido[2,3-d]pyrimidine-4,7(3H,8H)-dione (200 mg, 0.4 mmol, Example 8), trimethylsilyl acetylene (66 μL, 0.6 mmol), triethylamine (84 μL, 0.6 mmol), copper iodide (14 mg, cat) and dichlorobis(triphenylphoshine) palladium(II) (14 mg, 0.02 mmol) were mixed in THF (2 mL). The mixture was subjected to microwave irradiation at 120° C. for 20 minutes. The solvent was removed in vacuo and the residue dissolved in methanol. Potassium carbonate (50 mg) was added and the solution stirred at RT for 1 hour. After filtration and evaporation the residue was purified by HPLC to give 119 mg of the title compound. 1H NMR (400 MHz, CDCl3) δ ppm 1.79 (s, 3H) 3.11 (s, 1H) 3.54-3.66 (m, 3H) 3.82-3.90 (m, 1H) 3.94-4.02 (m, 1H) 4.30 (dd, J=14.15, 3.79 Hz, 1H) 6.67 (t, J=8.46 Hz, 1H) 7.19 (dd, J=8.21, 0.88 Hz, 1H) 7.21-7.25 (m, 1H) 8.27 (s, 1H) [M+H] calc'd for C20H19FN4O4, 399; found, 399.

Provenance & Evidence