Propylenediamine → 6-[4-(2-Trifluoromethylbenzoyl)piperazin-1-yl]pyridazine-3-carboxylic acid (2-aminopropyl)amide

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A mixture of 6-[4-(2-trifluoromethylbenzoyl)piperazin-1-yl]pyridazine-3-carboxylic acid methyl ester (0.200 g, 0.502 mmol) and propane-1,2-diamine (2 mL) was heated in a sealed tube at 140° C. for 12 hours. The mixture was cooled and concentrated under high vacuum to remove excess amount of propane-1,2-diamine. The residue was purified by column chromatography to afford 6-[4-(2-trifluoromethylbenzoyl)piperazin-1-yl]pyridazine-3-carboxylic acid (2-aminopropyl)amide (0.188 g, 85%) as a white foam. 1H NMR (300 MHz, MeOH-d4) δ 7.92 (d, J=9.3 Hz, 1H), 7.81 (d, J=7.9 Hz, 1H), 7.78-7.61 (m, 2H), 7.50 (d, J=7.3 Hz, 1H), 7.30 (d, J=9.6 Hz, 1H), 4.00-3.82 (m, 4H), 3.72 (t, J=4.9 Hz, 2H), 3.45-3.23 (m, 5H), 1.10 (d, J=6.3 Hz, 3H). MS (ES+) m/z 437.0 (M+1).

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