反应详情

A solution of 3.methyl 6-((6-bromo-[1,2,4]triazolo[4,3-a]pyridin-3-yl)difluoromethyl)imidazo[1,2-b]pyridazine-2-carboxylate (4.0 g, 9.45 mmol) and LiOH (0.340 g, 14.18 mmol) in 10% H2O/MeOH (150 mL) was stirred at ambient temperature for 4 hrs. Solvent was removed via rotary evaporation, and the resulting residue was diluted with H2O (100 mL). The aqueous phase was adjusted to pH=5 with concentrated HCl. The resulting precipitate was collected, rinsed with water, rinsed with EtOAc, and dried under vacuum over P2O5 for 18 hrs to provide the title compound, 6-((6-bromo-[1,2,4]triazolo[4,3-a]pyridin-3-yl)difluoromethyl)imidazo[1,2-b]pyridazine-2-carboxylic acid 45J (3.5 g, 8.55 mmol, 90%). 1H NMR (400 MHz, DMSO-d6) δ ppm 7.76 (dd, J=9.85, 1.77 Hz, 1 H) 7.82 (d, J=9.60 Hz, 1H) 8.02 (d, J=9.60 Hz, 1 H) 8.51 (d, J=9.85 Hz, 1 H) 8.90 (s, 1 H) 8.97 (s,1 H). ESI-MS:m/z 4.09 (M+H)+.

1. customSolvent was removed via rotary evaporation
2. additionthe resulting residue was diluted with H2O (100 mL)
3. customThe resulting precipitate was collected
4. washrinsed with water
5. washrinsed with EtOAc
6. dry with materialdried under vacuum over P2O5 for 18 hrs