Chloroacetaldehyde → 8-Bromo-6-chloro-7-phenylimidazo[1,2-b]pyridazine hydrochloride

Participants

Reaction Conditions

Reaction Steps

Chloroacetaldehyde (2.0 mL, 31.5 mmol) was added to a solution of crude 4-bromo-6-chloro-5-phenylpyridazin-3-amine (0.193 g, 0.676 mmol) from 1b in EtOH (5.0 mL). The mixture was heated in a sealed tube at 118° C. for 5 h. After cooling to room temperature, the reaction mixture was concentrated in vacuo, and suspended in acetone/Et2O (1:1, 3 mL), filtered, and washed with Et2O to give 8-bromo-6-chloro-7-phenylimidazo[1,2-b]pyridazine HCl salt (0.147 g, >94% purity).

Provenance & Evidence