Toluene → N1-[3-(1H-imidazo[4,5-c]quinolin-1-yl)propyl]benzamide

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A suspension of N1-{3-[(3-nitroquinolin-4-yl)amino]propyl}benzamide (1.0 g, 2.8 mmol) in isopropyl alcohol (120 mL) was warmed to dissolve some of the material. A catalytic amount of platinum on carbon was added and the reaction mixture was placed under a hydrogen atmosphere at 50 psi (3.4×104 pascals) on a Parr apparatus. After 3 hours the reaction mixture was filtered to remove catalyst. The filtrate was concentrated under vacuum to provide crude N1-{3-[(3-aminoquinolin-4-yl)amino]propyl}benzamide as an oil. Toluene (100 mL) was added to the oil followed by the addition of triethylorthoformate (0.8 g, 5.6 mmol). The reaction mixture was heated on a steam bath overnight. The reaction mixture was allowed to cool to ambient temperature. The resulting precipitate was isolated by filtration to provide 0.53 g of N1-[3-(1H-imidazo[4,5-c]quinolin-1-yl)propyl]benzamide as an off white solid, m.p. 188-190° C. 1H NMR (500 MHz, DMSO-d6) δ 8.67 (t, J=5.5 Hz, 1H), 8.50 (s, 1H), 8.37 (d, J=7.5 Hz, 1H), 8.17 (dd, J=8.0, 1.5 Hz, 11H), 7.87 (d, J=7.0 Hz, 2H), 7.71 (dt, J=7.5, 1.5 Hz, 11H), 7.56 (dt, J=7.5, 1.0 Hz, 1H), 7.54 (d, J=8.0 Hz, 2H), 7.48 (t, J=7.0 Hz, 2H), 4.78 (t, J=7.0 Hz, 2H), 3.38 (q, J=6.0 Hz, 2H), 2.18 (quintet, J=7.0 Hz, 2H).

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