4-Toluenesulfonyl chloride → N-[2-(4-amino-7-benzyloxy-2-ethoxymethyl-1H-imidazo[4,5-c]quinolin-1-yl)-1,1-dimethylethyl]methanesulfonamide

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Reaction Steps

mCPBA (11.2 g, 39.2 mmol) was added to a solution of N-[2-(7-benzyloxy-2-ethoxymethyl-1H-imidazo[4,5-c]quinolin-1-yl)-1,1-dimethylethyl]methanesulfonamide (prepared as described in Parts A-D of Example 52, 17.2 g, 35.6 mmol) in dichloromethane (350 mL). The solution was stirred overnight and additional mCPBA (approximately 1-2 g) was added. After 20 minutes, concentrated ammonium hydroxide (150 mL) was added. The mixture was stirred for 10 minutes and p-toluenesulfonyl chloride (8.20 g, 42.8 mmol) was added in portions. The mixture was stirred at ambient temperature for 2 days, then was filtered. A white solid was obtained, which was slurried in water, filtered, and dried to yield 11.7 g of N-{2-[4-amino-7-(benzyloxy)-2-(ethoxymethyl)-1H-imidazo[4,5-c]quinolin-1-yl]-1,1-dimethylethyl}methanesulfonamide. A small sample, 500 mg, was purified to yield 300 mg of analytically pure N-{2-[4-amino-7-(benzyloxy)-2-(ethoxymethyl)-1H-imidazo[4,5-c]quinolin-1-yl]-1,1-dimethylethyl}methanesulfonamide as a white solid, mp 264-266° C.

Provenance & Evidence