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To a solution of tert-butyl 4-{[2-(ethoxymethyl)-1H-imidazo[4,5-c]quinolin-1-yl]methyl}-4-hydroxypiperidine-1-carboxylate (96%, 10.0 g, 22.7 mmol) in dichloromethane (150 mL) at rt was added m-CPBA (55%, 7.12 g, 22.7 mmol). After 1.5 h, the mixture was cooled to 0° C. and concentrated ammonium hydroxide (150 mL) was added, followed by TsCl (4.54 g, 23.8 mmol). The reaction was stirred rapidly overnight. More TsCl (1.00 g and 0.47 g) was added as the mixture was stirred an additional 6 h. Water (200 mL) was added and the mixture was extracted with dichloromethane (3×200 mL). The combined organic phases were washed with brine (3×250 mL) and dried over MgSO4, filtered, and concentrated to a foam, which was crystallized from acetonitrile twice. The fine yellow crystals were dried under vacuum to yield 1.60 g (15%) of tert-butyl 4-{[4-amino-2-(ethoxymethyl)-1H-imidazo[4,5-c]quinolin-1-yl]methyl}-4-hydroxypiperidine-1-carboxylate, mp 195-197° C. 1H NMR (CDCl3, 300 MHz) δ 8.04 (dm, J=8.3 Hz, 1H), 7.82 (dm, J=8.3 Hz, 1H), 7.53 (m, 1H), 7.31 (m, 1H), 5.40 (br s, 2H), 4.85 (s, 2H), 4.75 (br s, 2H), 3.93 (br s, 3H), 3.72 (q, J=7.0 Hz, 2H), 3.03 (m, 2H), 1.76 (m, 2H), 1.49-1.40 (m, 2H), 1.42 (s, 9H), 1.27 (t, J=7.0 Hz, 3H); MS (APCI) m/z 456 (M+H+); Anal. calcd for C24H33N5O4: C, 63.28; H, 7.30; N, 15.37. Found: C, 63.32; H, 7.53; N, 15.39.

1. stirringwas stirred an additional 6 h
2. extractionthe mixture was extracted with dichloromethane (3×200 mL)
3. washThe combined organic phases were washed with brine (3×250 mL)
4. dry with materialdried over MgSO4
5. filtrationfiltered
6. concentrationconcentrated to a foam, which
7. customwas crystallized from acetonitrile twice
8. customThe fine yellow crystals were dried under vacuum