Sodium Iodide → N-[4-(4-amino-2-methyl-2H-pyrazolo[3,4-c]quinolin-1-yl)butyl]methanesulfonamide

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Methanesulfonamide (1.5 g, 16.5 mmol) was added to a suspension of sodium hydride (60% dispersion in mineral oil, 0.660 g, 16.5 mmol) in DMF (10 mL); the reaction was stirred for five minutes. 1-(4-Chlorobutyl)-2-methyl-2H-pyrazolo[3,4-c]quinolin-4-amine (0.952 g, 3.3 mmol) in DMF (1 mL) and sodium iodide (123 mg, 0.825 mmol) were sequentially added. The reaction was heated at 80° C. for four hours, allowed to cool to ambient temperature, and poured into ice water (70 mL). The resulting mixture was extracted with dichloromethane (6×50 mL), and the combined extracts were dried over sodium sulfate, filtered, and concentrated under reduced pressure. The residue was purified twice by chromatography using a HORIZON HPFC system (40+M cartridge, eluting with 0-30% CMA in chloroform first and 5-10% methanol in dichloromethane second) followed by recrystallization from acetonitrile to provide 440 mg of N-[4-(4-amino-2-methyl-2H-pyrazolo[3,4-c]quinolin-1-yl)butyl]methanesulfonamide as light tan crystals, mp 188-189° C.

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