Diisopropylethylamine → 6-[4-[4-[3-(4-Acetylpiperazin-1-yl)propoxy]phenyl]piperidin-1-yl]-3-(trifluoromethyl)[1,2,4]triazolo[4,3-b]pyridazine

Participants

Reaction Conditions

Reaction Steps

DIPEA (5.21 mL, 29.93 mmol) was added to 6-chloro-3-(trifluoromethyl)-[1,2,4]triazolo[4,3-b]pyridazine (obtained as described in Monatsh. Chem. 1972, 103, 1591) (6.06 g, 27.21 mmol) and 4-[4-[3-(4-acetylpiperazin-1-yl)propoxy]phenyl]piperidine (9.40 g, 27.21 mmol) in DMF (200 mL). The resulting solution was stirred at 80° C. for 1 hour. The reaction mixture was cooled to room temperature then evaporated to dryness. Water (600 mL) was then added and the mixture extracted with DCM (2×600 mL). The combined organic layers were dried (Na2SO4), filtered and concentrated under reduced pressure. The crude product was purified by flash silica chromatography, elution gradient 0 to 10% MeOH in DCM. Pure fractions were evaporated to dryness to afford 6-[4-[4-[3-(4-acetylpiperazin-1-yl)propoxy]phenyl]piperidin-1-yl]-3-(trifluoromethyl)[1,2,4]triazolo[4,3-b]pyridazine (13.80 g, 95%) as an orange solid.

Provenance & Evidence