Dimethylformamide → tert-butyl 3-(3-(2,4-difluorophenyl)-4-(3-isopropyl-[1,2,4]triazolo[4,3-b]pyridazin-6-yl)-1H-pyrazol-1-yl)pyrrolidine-1-carboxylate

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Reaction Steps

To a round bottom flask was added NaH (0.065 g, 1.6 mmol), DMF (4 mL) and 6-(3-(2,4-difluorophenyl)-1H-pyrazol-4-yl)-3-isopropyl-[1,2,4]triazolo[4,3-b]pyridazine (0.500 g, 1.47 mmol, Example #L.1.1). The reaction mixture was stirred for about 30 min at ambient temperature. tert-Butyl 3-(tosyloxy)pyrrolidine-1-carboxylate (0.652 g, 1.91 mmol, prepared according to US 2002/0151712, Example #34c) was added and the reaction mixture was stirred for about 30 min at ambient temperature. The reaction mixture was heated to about 75° C. for about 1 h. The reaction mixture was diluted with DCM (50 mL), washed with water (50 mL), dried with MgSO4, filtered and concentrated in vacuo. The reaction mixture was purified by flash chromatography (40 g RediSep® silica gel; DCM/MeOH gradient from 1:0 to 90:10) to give the title compound (0.446 g, 60%) as a mixture of regioisomers: LC/MS (Table 1, Method g) Rt=3.66 min; MS m/z: 510.4 (M+H)+.

Provenance & Evidence