Chloroacetaldehyde → Hydrochloric Acid

Participants

Reaction Conditions

Reaction Steps

Chloroacetaldehyde (17.26 ml, 0.111 mol, 50% in H2O) was added to a solution of crude 4-bromo-6-chloro-5-ethylpyridazin-3-amine (5.23 g, 0.022 mol) from 1c in EtOH (30 mL). The mixture was heated in a sealed vial at 50° C. for 24 h. Solvent was removed in vacuo and the solid was resuspended in acetone/Et2O (1/1, 5 mL), filtered, and then washed with Et2O to give 8-bromo-6-chloro-7-ethylimidazo[1,2-b]pyridazine as an HCl salt (3.02 g, >80% pure). LC/MS, m/e 260 (M+1). HPLC Rt, 2.68 min. Waters Sunfire C18 column (4.6×50 mm). 0%-100% B. Solvent B: (90% MeOH, 10% H2O, 0.1% TFA). Solvent A: (10% MeOH, 90% H2O, 0.1% TFA). Gradient, start % B=0, final % B=100, gradient time 4 min, hold at 100% B 1 min, flow rate 4 mL/min.

Provenance & Evidence