Diethyl methylmalonate → 5-Hydroxy-3-(4-methoxybenzyl)-6,8-dimethylpyrido[2,3-d]pyrimidine-4,7(3H,8H)-dione

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Reaction Conditions

Reaction Steps

3-(4-Methoxybenzyl)-6-(methylamino)pyrimidin-4(3H)-one (14.8 g, 60.2 mmol, 1 eq, compound 8A) and diethyl methylmalonate (61.6 mL, 361 mmol, 6 eq) were mixed in phenyl ether (25 mL) and heated at 240° C. for 2 days. The solution was allowed to RT and left standing overnight. The tan precipitate which formed was collected and washed with ether to give 15.2 g of the title compound as a tan solid (78%). 1H NMR (400 MHz, DMSO-d6) δ ppm 1.89 (s, 3 H) 3.55 (s, 3 H) 3.74 (s, 3 H) 5.14 (s, 2 H) 6.93 (d, J=8.59 Hz, 2 H) 7.37 (d, J=8.59 Hz, 2 H) 8.89 (s, 1 H) 11.82 (s, 1 H). %). [M+H] calc'd for C17H17N3O4, 328; found, 328.

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