Potassium Iodide → N-(6-([1,2,4]triazolo[4,3-a]pyridin-3-ylthio)imidazo[1,2-b]pyridazin-2-yl)cyclopropanecarboxamide

Participants

Reaction Conditions

Reaction Steps

A mixture of 6-([1,2,4]triazolo[4,3-a]pyridin-3-ylthio)pyridazin-3-amine (2.443 g, 10 mmol), N-(2-bromoacetyl)cyclopropanecarboxamide (3.09 g, 15.00 mmol), potassium hydrogenphosphate (5.23 g, 30.0 mmol) and potassium iodide (0.830 g, 5.00 mmol) in DMA (100 mL) was stirred at 120° C. for 2 hrs. Additional amounts of N-(2-bromoacetyl)cyclopropanecarboxamide (2.06 g, 10 mmol) and potassium hydrogenphosphate (1.74 g, 10 mmol) were added to the mixture and the reaction was stirred at 120° C. for another 2 hrs. The reaction was then stirred at room temperature overnight. The reaction mixture was again stirred at 140° C. for 3 hrs and then cooled to room temperature. The resulting solid was filtered off and rinsed with DMA. The filtrate was concentrated to 100 mL and then poured into water (300 mL). The resulting precipitate was collected by filtration and rinsed thoroughly with water. The solid material was re-suspended in 10% MeOH/CH2Cl2 (100 mL), sonicated, refluxed for 30 min and cooled to room temperature. The MeOH/CH2Cl2 solution was filtered through a silica plug, rinsed with 10% MeOH/CH2Cl2 (200 mL). To above organic solution, activated charcoal (0.5 g) was added, the solution was refluxed for 30 min, and then stirred at room temperature overnight. The charcoal was filtered through Celite, and the filtrate was concentrated to dryness to provide an off white solid. This solid was refluxed in MeOH (10 mL) for 30 min. and cooled to room temperature. The resulting off white solid was collected by filtration, rinsed with MeOH (2 mL) and dried in vacuum to provide the title compound, N-(6-([1,2,4]Triazolo[4,3-a]pyridin-3-ylthio)imidazo[1,2-b]pyridazin-2-yl)cyclopropanecarboxamide (1.2 g). 1H NMR (400 MHz, DMSO-d6) δ=11.17 (s, 1 H), 8.57-8.44 (m, 1 H), 8.03-7.94 (m, 1 H), 7.96-7.88 (m, 2 H), 7.59 (ddd, J=1.0, 6.6, 9.3 Hz, 1 H), 7.22-7.11 (m, 1 H), 7.11-7.03 (m, 1 H), 1.97-1.84 (m, 1 H), 0.83-0.73 (m, 4 H) ESI-MS:m/z 352.3 (M+H)+. MP 193-195° C.

Provenance & Evidence