Sodium Chloride → 1-[4-amino-2-(2-methoxyethyl)-7-(5-methylisoxazol-3-ylmethoxy)-1H-imidazo[4,5-c]quinolin-1-yl]-2-methylpropan-2-ol

Participants

Reaction Steps

4-Amino-1-(2-hydroxy-2-methylpropyl)-2-(2-methoxyethyl)-1H-imidazo[4,5-c]quinolin-7-ol was alkylated as described in the general procedure for Examples 7-20, using 2 equivalents of cesium carbonate and 1.1 eq of 3-(bromomethyl)-5-methylisoxazole. After stirring overnight at room temperature, the reaction mixture was poured into 200 mL of water containing 20 g of sodium chloride. The resulting precipitate was filtered, dissolved in dichloromethane, and purified by flash column chromatography on silica gel, eluting with a gradient of 0-8% methanol in dichloromethane. The clean fractions were combined and concentrated. The resulting solid was slurried in cold acetonitrile, filtered, and dried under reduced pressure to yield 315 mg of 1-[4-amino-2-(2-methoxyethyl)-7-(5-methylisoxazol-3-ylmethoxy)-1H-imidazo[4,5-c]quinolin-1-yl]-2-methylpropan-2-ol as an off-white solid, mp 169.0-170.0.

Provenance & Evidence