Tetrahydrofuran → 7,8-bis(4-chlorophenyl)-[1,2,4]triazolo[4,3-b]pyridazin-3(2H)-one

Participants

Reaction Steps

To a THF (20 mL) solution of carbonyldiimidazole (CDI), (1.7 g, 10.5 mmol) was added 1-(4,5-bis(4-chlorophenyl)pyridazin-3-yl)hydrazine (0.7 g, 2.1 mmol). The resultant brown solution was stirred at RT for 15 min. After this time, the reaction solution was poured into water (50 mL). The resultant pale colored solid was collected by filtration. Water was used to rinse the solid thoroughly to afford 7,8-bis(4-chlorophenyl)-[1,2,4]triazolo[4,3-b]pyridazin-3(2H)-one (0.75 g, 100%). MS (M+H)=357; 1H NMR (DMSO-d6, 500 MHz): δ 12.86 (1H, s), 8.37 (1H, s), 7.42-7.48 (4H, m), 7.35 (2H, d, J=10.0 Hz), 7.27 (2H, d, J=10.0 Hz).

Provenance & Evidence