2,5-Dichlorobenzoic acid → 6-[4-(2,5-DICHLOROBENZOYL)PIPERAZIN-1-YL]PYRIDAZINE-3-CARBOXYLIC Acid (3-METHYLBUTYL)AMIDE

Participants

Reaction Steps

A mixture of 6-piperazin-1-yl-pyridazine-3-carboxylic acid (3-methylbutyl)amide (0.255 mmol), 2,5-dichlorobenzoic acid (0.31 mmol), 1,8-diazabicylco[5.4.0]undec-7-ene (0.51 mmol) and 1-hydroxybenozotriazole hydrate (0.31 mmol) in DMF (2 mL) was stirred at ambient temperature for 15 min. 1-(3-Dimethylaminopropyl)-3-ethylcarbodiimide (0.31 mmol) was then added. The mixture was stirred at ambient temperature overnight, and then diluted with EtOAc (50 mL) and washed with aqueous saturated NaHCO3 (2×20 mL) and brine (2×20 mL). The organic extract was dried over anhydrous Na2SO4, concentrated, and purified by flash chromatography to give the title compound as a white solid (102 mg, 89% yield). 1H NMR (500 MHz, CDCl3) δ 8.07, 7.85, 7.32-7.40, 7.01, 4.01-4.08, 3.77-3.93, 3.35-3.55, 1.65-1.75, 1.52, 0.94. MS (ES+) m/z 450 (M+1).

Provenance & Evidence