Citric Acid → 7-(7-(Piperidin-1-yl)-2,3-di-p-tolyl-7,8-dihydropyrido[2,3-b]pyrazin-5(6H)-yl)heptanoic acid

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Reaction Steps

A solution of ethyl 7-(7-(piperidin-1-yl)-2,3-di-p-tolyl-7,8-dihydropyrido[2,3-b]pyrazin-5(6H)-yl)heptanoate (step 8) (39 mg, 0.070 mmol) in EtOH (1 ml) was treated with 2M NaOH (0.105 mL, 0.211 mmol) and stirred at room temperature overnight. The resulting mixture was added to water (30 ml) and the pH was adjusted to pH4 by addition of 10% aqueous citric acid solution. The aqueous portion was extracted with DCM (×3) and the combined extracts were passed through a phase separating column. The solvent was removed under reduced pressure to afford the titled compound;

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