Chloroform → 1-{[2-(ethoxymethyl)-1H-imidazo[4,5-c]quinolin-1-yl]methyl}cyclobutanol

Participants

Reaction Steps

To a mixture of 1-{[(3-aminoquinolin-4-yl)amino]methyl}cyclobutanol (23.1 mmol, prepared as described in Part D) in dichloromethane (154 mL) and triethylamine (3.54 mL, 25.4 mmol) at 0° C. was added chloroform (100 mL). The mixture was allowed to warm to rt and approximately two thirds of the starting material dissolved. To the mixture was slowly added ethoxyacetyl chloride (88%, 3.1 g, 24.3 mmol). The solution was stirred at rt for 2 h. More triethylamine (2 mL) and ethoxyacetyl chloride (88%, 1.0 g) were added. After an additional 16 h, the reaction solution was concentrated in vacuo. To the residue was added ethanol (190 mL) and triethylamine (13 mL). The resulting solution was heated at reflux for 20 h and then concentrated in vacuo to a yellow solid. The solid was partitioned between dichloromethane (400 mL) and water (100 mL). The organic layer was washed with water (100 mL) and brine (100 mL). The organic layer was dried over MgSO4, filtered, and concentrated. The crude product was crystallized from acetonitrile and the crystals were isolated by filtration to provide 1-{[2-(ethoxymethyl)-1H-imidazo[4,5-c]quinolin-1-yl]methyl}cyclobutanol (4.52 g, 63%).

Provenance & Evidence