Ammonia → 2-(ethoxymethyl)-1-[(3-methyl-4,5-dihydroisoxazol-5-yl)methyl]-1H-imidazo[4,5-c]quinolin-4-amine

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Reaction Conditions

Reaction Steps

4-Chloro-2-(ethoxymethyl)-1-[(3-methyl-4,5-dihydroisoxazol-5-yl)methyl]-1H-imidazo[4,5-c]quinoline (1.30 g, 3.62 mmol) was treated with a solution of 7 M ammonia in methanol (60 mL), and the mixture was sealed in a pressure vessel and heated at 150° C. for 24 hours. The volatiles were removed under reduced pressure, and the residue was partitioned between saturated aqueous sodium bicarbonate and dichloromethane. The aqueous layer was extracted with two additional portions of dichloromethane. The combined organic layers were washed with brine, dried over magnesium sulfate, filtered, and concentrated. The crude product was purified by flash chromatography (silica gel, gradient elution using 98:2 to 96:4 dichloromethane/methanol) to afford 2-(ethoxymethyl)-1-[(3-methyl-4,5-dihydroisoxazol-5-yl)methyl]-1H-imidazo[4,5-c]quinolin-4-amine (1.10 g) as a white solid that was crystallized from acetonitrile to provide white needles, mp 204-205° C.

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