Dichloromethane → 1-[8-bromo-2-(ethoxymethyl)-1H-imidazo[4,5-c]quinolin-1-yl]-2-methylpropan-2-ol

Participants

Reaction Steps

Ethoxyacetyl chloride (6.2 g, 50.5 mmol) was added dropwise to a solution of crude 1-[(3-amino-6-bromoquinolin-4-yl)amino]-2-methylpropan-2-ol, dichloromethane (500 mL), and triethylamine (7 mL, 50.5 mmol). After stirring for 16 hours, water was added and the mixture was stirred for an additional 2 hours. The fractions were separated. The organic fraction was washed with water, concentrated under reduced pressure and redissolved in ethanol (500 mL). Water (150 mL) and potassium carbonate (10.5 g) were added and the mixture was heated at reflux temperature for 3 hours. The ethanol was removed under reduced pressure. The remaining aqueous fraction was extracted with ethyl acetate (2×500 mL). The organic fractions were combined, washed with water followed by saturated aqueous sodium chloride, dried over anhydrous sodium sulfate, filtered, and concentrated under reduced pressure. Recrystallization from acetonitrile provided 10.4 g of 1-[8-bromo-2-(ethoxymethyl)-1H-imidazo[4,5-c]quinolin-1-yl]-2-methylpropan-2-ol as a tan powder.

Provenance & Evidence