Potassium Carbonate → Ethyl 9-(6-oxo-2,3-di-p-tolyl-7,8-dihydropyrido[2,3-b]pyrazin-5(6H)-yl)nonanoate

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A solution of 2,3-di-p-tolyl-7,8-dihydropyrido[2,3-b]pyrazin-6(5H)-one ((prepared according to the preparation procedures disclosed in PCT patent application PCT/EP2011/062028, Example 12.1 step 1) (500 mg, 1.518 mmol) and potassium carbonate (1049 mg, 7.59 mmol) in DMF (15 ml) under N2 was treated with ethyl 9-bromononanoate (805 mg, 3.04 mmol) and stirred at RT overnight. A further portion of ethyl 9-bromononanoate (805 mg, 3.04 mmol) was added and stirring continued at RT for 3 days. The mixture was diluted with water and extracted with EtOAc. The combined organic extracts were washed with brine (×3), dried (MgSO4) and the solvent was removed under reduced pressure to afford the titled compound as a yellow oil;

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