Diphenyl Ether → 3-Benzyl-5-hydroxy-8-methylpyrido[2,3-d]pyrimidine-4,7(3H,8H)-dione

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Reaction Steps

3-Benzyl-6-(methylamino)pyrimidin-4(3H)-one (compound 5A) (2 g, 9.3 mmol, 1 eq) and diethyl malonate (2 mL, 14.5 mmol, 1.55 eq) were heated in phenyl ether (3 mL, 19 mmol, 2 eq) at 240° C. in a microwave reactor for 6 hours. Upon cooling a precipitate formed which was filtered and washed with ether to give 1.5 g of the title compound as a tan solid (57%). 1H NMR (400 MHz, DMSO-d6) δ ppm 3.51 (s, 3H) 5.20 (s, 2H) 5.72 (s, 1H) 7.31 (br. s., 1H) 7.38 (d, J=3.03 Hz, 4H) 8.93 (s, 1H) 11.61 (s, 1H). [M+H] calc'd for C15H13N3O3, 284. found, 284.

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