Methanesulfonyl chloride → 6-(3-(2,4-Difluorophenyl)-1-(1-(methylsulfonyl)pyrrolidin-3-yl)-1H-pyrazol-4-yl)-3-isopropyl-[1,2,4]triazolo[4,3-b]pyridazine

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Reaction Steps

To a round bottom flask was added 6-(3-(2,4-difluorophenyl)-1-(pyrrolidin-3-yl)-1H-pyrazol-4-yl)-3-isopropyl-[1,2,4]triazolo[4,3-b]pyridazine (0.105 g, 0.256 mmol, Example #Q.1.1.1), DCM (5 mL) and DIPEA (0.054 mL, 0.31 mmol). Then methanesulfonyl chloride (0.020 mL, 0.26 mmol) was added. The reaction mixture was stirred at ambient temperature for about 10 min. The reaction mixture was purified directly by flash chromatography (40 g RediSep® silica gel; DCM/MeOH gradient from 1:0 to 9:1) to give the title compound (0.120 g, 96%): LC/MS (Table 1, Method g) Rt=2.28 min; MS m/z: 488.3 (M+H)+.

Provenance & Evidence