Diisopropylethylamine → Tert-butyl 4-[3-(difluoromethyl)-[1,2,4]triazolo[4,3-b]pyridazin-6-yl]piperazine-1-carboxylate

Beteiligte Stoffe

Reaktionsschritte

A stirred solution of 6-chloro-3-(difluoromethyl)-[1,2,4]triazolo[4,3-b]pyridazine (3.07 g, 15 mmol), tert-butyl piperazine-1-carboxylate (3.35 g, 18.00 mmol) and DIPEA (3.85 mL, 22.50 mmol) in DMF (25 mL) was heated at 100° C. for 1 hour. The reaction mixture was evaporated to dryness, redissolved in DCM and washed sequentially with 1M aqueous K2CO3, water and saturated brine. The organic layer was dried over MgSO4, filtered and evaporated. The crude product was triturated with ether and the solid was collected by filtration, washed with ether and dried under vacuum to afford tert-butyl 4-[3-(difluoromethyl)-[1,2,4]triazolo[4,3-b]pyridazin-6-yl]piperazine-1-carboxylate (5.05 g, 95%) as a white crystalline solid.

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