Potassium Carbonate → Diethyl 1-(1-cyanoethyl)-1H-pyrrolo[2,3-b]pyridine-2,6-dicarboxylate

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Reaction Steps

To a solution of diethyl 1H-pyrrolo[2,3-b]pyridine-2,6-dicarboxylate (Intermediate D, 1.55 g, 5.91 mmol) in DMF (15 mL) is added potassium carbonate (2.45 g, 17.7 mmol), and the mixture is stirred at room temperature for 20 min. 2-bromopropionitrile (1.05 mL, 11.8 mmol) is added, the mixture is warmed to 80° C., and is stirred overnight. After being cooled to room temperature, the mixture is poured onto H2O, and the aqueous layer is extracted with EtOAc (3×100 mL). The combined organic extracts are dried (MgSO4), filtered, and concentrated. The crude material is purified via flash column chromatography using a gradient elution of 10-50% ethyl acetate/hexanes to afford the title compound as a bright yellow solid (809 mg, 43%).

Provenance & Evidence