Diisopropylethylamine → 3-[Chloro(difluoro)methyl]-6-[4-(3,5-dichloropyridin-4-yl)piperazin-1-yl][1,2,4]triazolo[4,3-b]pyridazine

Participants

Reaction Conditions

Reaction Steps

A solution of 6-chloro-3-[chloro(difluoro)methyl]-[1,2,4]triazolo[4,3-b]pyridazine (obtained as described in Examples 335-338, preparation of starting materials) (53 mg, 0.22 mmol) in ethanol (1 mL) was added to 1-(3,5-dichloropyridin-4-yl)piperazine (77 mg, 0.33 mmol). The reaction mixture was treated with DIPEA (43 mg, 0.33 mmol) and the mixture was heated at 70° C. for 4 hours. The reaction mixture was evaporated to leave an involatile residue that was purified by preparative reverse phase chromatography to give 3-[chloro(difluoro)methyl]-6-[4-(3,5-dichloropyridin-4-yl)piperazin-1-yl][1,2,4]triazolo[4,3-b]pyridazine (28 mg, 29%).

Provenance & Evidence