Triethylamine → [4-(6-Chloropyridazin-3-yl)piperazin-1-yl]-(2-trifluoromethylphenyl)methanone

Participants

Reaction Steps

Triethylamine (2.0 mL) was added to an ice cold solution of 3-chloro-6-piperazin-1-ylpyridazine (1.00 g, 6.69 mmol) in dichloromethane (10 mL), followed by the addition of 2-trifluoromethylbenzoyl chloride (2.10 g, 10.03 mmol). The mixture was allowed to warm up to room temperature and then stirred for 30 minutes. The solvent was removed in vacuo and the crude mixture was dissolved in ethyl acetate (15 mL), washed with water and dried over anhydrous Na2SO4. [4-(6-chloropyridazin-3-yl)piperazin-1-yl]-(2-trifluoromethylphenyl)methanone was obtained as a thick liquid after purified by column chromatography in 79% yield (1.96 g). 1H NMR (300 MHz, CDCl3) δ 7.71 (d, J=7.9 Hz, 1H), 7.63-7.50 (m, 2H), 7.32 (d, J=7.3 Hz, 1H), 7.21 (t, J=4.4 Hz, 1H), 6.92 (d, J=9.5 Hz, 1H), 4.20-3.92 (m, 1H), 3.92-3.80 (m, 1H), 3.70-3.55 (m, 4H), 3.30 (t, J=5.3 Hz, 1H). 13C NMR (75 MHz, CDCl3) δ 167.6, 158.7, 147.7, 134.2, 134.2, 132.3, 129.5, 129.1, 127.2, 126.8, 126.8, 115.6, 46.3, 45.2, 44.7, 41.2. MS (ES+) m/z 371.1 and 373.1 (M+1).

Provenance & Evidence