Hydrochloric Acid → 6-(4-Propionylpiperazin-1-yl)picolinaldehyde

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To a high-pressure tube was added 6-bromopicolinaldehyde (1, 2.00 g, 10.7 mmol), 1-(piperazin-1-yl)propan-1-one (18, 3.82 g, 26.9 mmol), potassium carbonate (6.69 g, 48.4 mmol) and anhydrous DMF (12 mL). The tube was sealed and the reaction mixture was heated at 120° C. for 17 h. The reaction suspension was poured into water (100 mL) and the mixture was brought to pH 7 using 2 N aq. HCl (20 mL). The solution was extracted with CH2Cl2 (3×100 mL), washed with brine (300 mL), dried over Na2SO4, filtered and concentrated to a brown oil. The product was purified by silica gel chromatography eluting with 0-5% CH3OH in CH2Cl2 to afford the title compound (0.815 g, 31%) as an orange solid: 1H NMR (500 MHz, CDCl3) δ 9.89 (s, 1H), 7.68 (t, J=8.0 Hz, 1H), 7.33 (d, J=8.0 Hz, 1H), 6.84 (d, J=8.0 Hz, 1H), 3.84-3.73 (m, 2H), 3.68-3.59 (m, 2H), 2.40 (q, J=7.5 Hz, 2H), 1.19 (t, J=7.5 Hz, 3H).

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