Triethylamine → HCID 59716714, compound

Participants

Reaction Steps

To a solution of 7,8-bis(4-chlorophenyl)-[1,2,4]triazolo[4,3-b]pyridazin-3(2H)-one, (50 mg, 0.14 mmol), prepared as described in Example 1 and 4-chlorophenyboronic acid (44 mg, 0.28 mmol) in pyridine (1.5 mL) was added copper (II) acetate (51 mg, 0.28 mmol) followed by triethylamine (0.04 mL, 0.28 mmol) and 3 Å molecular sieves (100 mg) under argon. The reaction mixture was stirred at reflux for 6 h. After this time, the reaction mixture was cooled to RT and diluted with water (5 mL). The resultant mixture was extracted with EtOAc (3×5 mL). The combined organic layers were washed with water (2×5 mL) and saturated aqueous NaCl (2×5 mL). The organic layer was dried over MgSO4, filtered and concentrated to obtain a crude product. The crude product was purified by preparative HPLC to give 2,7,8-tris(4-chlorophenyl)-[1,2,4]triazolo[4,3-b]pyridazin-3(2H)-one (5 mg, 8%) as yellow lyophilate. HPLC: 4.35 min; M+H=467; 1H NMR (CDCl3) δ 8.22 (1H, s), 8.10 (2H, d, J=10.0 Hz), 7.43 (2H, d, J=10.0 Hz), 7.35-7.38 (6H, m), 7.15 (2H, d, J=10.0 Hz).

Provenance & Evidence