Pyrrolidine → 2-Chloro-6-(pyrrolidin-1-yl)pyridine-4-carbonitrile

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A solution of 2,6-dichloropyridine-4-carbonitrile 24 (4 g, 23.5 mmol) in abs. EtOH (10 mL) was added with pyrrolidine (1.15 mL, 1 mol eq) and the mixture was heated at 70° C. for 6 h. The solvent was removed under reduced pressure, water was added to the residue and the aqueous phase was extracted with EtOAc (3×40 mL). The combined organic phase was washed with brine (1×60 mL), dried over Na2SO4 and evaporated to afford 25A as a pale yellow deliquescent solid (4.2 g, 20 mmol, 87% Yield). 1HNMR (DMSO, 400 MHz) δ 2.00 (m, 4H), 3.42 (m, 4H), 6.39 (s, 1H), 6.61 (s, 1H).

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