Dimethylformamide → HCID 11952517, compound

Participants

Reaction Steps

Isopropyl isocyanate (0.29 g, 0.33 mL, 3.39 mmol) was added to a stirring suspension of N1-(2-piperidin-4-ylethyl)-2-propyl-2H-pyrazolo[3,4-c]quinoline-1,4-diamine dihydrochloride (1.2 g, 2.83 mmol) and triethylamine (2.9 g, 3.9 mL, 28.3 mmol) in dichloromethane (100 mL). After 10 minutes, N,N-dimethylformamide (15 mL) was added and the resulting suspension was stirred at ambient temperature 16 hours. The dichloromethane was removed under reduced pressure and water (100 mL) was added to the resulting oil. A solid formed which was removed by filtration and discarded. The filtrate was transferred to a separatory funnel and extracted with dichloromethane (50 mL). The aqueous layer was saturated with solid sodium bicarbonate and extracted with dichlioromethane (3×50 mL). The organic fractions were combined, dried over magnesium sulfate, filtered, and concentrated under reduced pressure. The resulting brown oil was purified by column chromatography using a HORIZON HPFC system (silica cartridge, eluting with 3-15% methanol in dichloromethane). The resulting oil was crystallized from acetonitrile and isolated by filtration to yield 132 mg of 4-{2-[(4-amino-2-propyl-2H-pyrazolo[3,4-c]quinolin-1-yl)amino]ethyl}-N-isopropylpiperidine-1-carboxamide as a white solid, mp 168-170° C. Anal. calcd for C24H35N7O: C, 65.88; H, 8.06; N, 22.41. Found: C, 65.89; H, 8.24; N, 22.67.

Provenance & Evidence