Potassium Carbonate → (R)-3-(2,3-Dihydroxypropoxy)-5-(2-fluoro-4-iodophenylamino)-8-methylpyrido[2,3-d]pyrimidine-4,7(3H,8H)-dione

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Reaction Conditions

Reaction Steps

Compound 5F (1.31 g, 3.17 mmol), potassium carbonate (1.1 g, 7.92 mmol) and 1-chloro-2,4-dinitronbenzene (1.60 g, 7.92 mmol) were stirred in DMA at 80° C. for 2 hours. (R)—O-((2,2-Dimethyl-1,3-dioxolan-4-yl)methyl)hydroxylamine (4.66 g, 31.7 mmol) was added at r.t and the reaction was stirred for 1 hour at 80° C. Purification by prep-HPLC gave 210 mg (13%) of the title compound as a clear yellow solid (Deprotection occurred while concentrating the purification fractions containing 0.5% of TFA). 1H NMR (400 MHz, DMSO-d6): 6 ppm 10.18 (s, 1H) 8.93 (s, 1H) 7.81 (dd, J=10.11, 1.77 Hz, 1H) 7.62 (dd, J=7.58, 1.01 Hz, 1H) 7.37 (t, J=8.46 Hz, 1H) 5.56 (s, 1H) 4.39 (dd, J=10.74, 3.16 Hz, 1H) 4.21 (dd, J=10.61, 7.33 Hz, 1H) 3.82-3.88 (m, 1H) 3.50 (s, 3H) 3.42-3.46 (m, 2H). MS (ES) [m+H] calc'd for C17H16FIN4O5, 503. found 503.

Provenance & Evidence