6-[4-[4-(Benzyloxy)phenoxy]piperidin-1-yl]-3-(trifluoromethyl)-[1,2,4]triazolo[4,3-b]pyridazine → 4-[[1-[3-(Trifluoromethyl)-[1,2,4]triazolo[4,3-b]pyridazin-6-yl]piperidin-4-yl]oxy]phenol

Participants

Reaction Steps

10% Palladium on carbon (0.574 g, 0.54 mmol) was added to 6-[4-[4-(benzyloxy)phenoxy]piperidin-1-yl]-3-(trifluoromethyl)-[1,2,4]triazolo[4,3-b]pyridazine (2.53 g, 5.39 mmol) in MeOH (30 mL) under an atmosphere of hydrogen. The resulting suspension was stirred at ambient temperature for 24 hours. The reaction mixture was evaporated. The crude product was purified by flash silica chromatography, elution gradient 0 to 3% MeOH in DCM. Pure fractions were evaporated to dryness to afford 4-[[1-[3-(trifluoromethyl)-[1,2,4]triazolo[4,3-b]pyridazin-6-yl]piperidin-4-yl]oxy]phenol (1.760 g, 86%) as a gum which crystallised on standing.

Provenance & Evidence