Methyl iodide → 6-chloro-4-(1,5-dimethyl-1H-pyrazol-3-ylamino)-2-methylpyridazin-3(2H)-one

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To a mixture of 127a (480 mg, 2.0 mmol) in anhydrous DMF (10 mL) was added NaH (purity 60%) (64 mg, 1.6 mmol) at 0° C. and the resulting mixture was stirred for 0.5 h. To the mixture was added iodomethane (227 mg, 1.6 mmol) in DMF (5 mL) dropwise at 0° C. The reaction mixture was stirred for additional 1.5 h and quenched with water (20 mL). It was then extracted with dichloromethane (3×20 mL) and the combined organic layer was evaporated under reduced pressure. The residue was purified by reverse-phase Combiflush (A: 2% aqueous NH4HCO3, B: acetonitrile) to afford 127b (120 mg, 24%) as a light yellow solid. MS-ESI: [M+H]+ 254.3

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