Hydrochloric Acid → 3-methyl-2-(2-(quinoxalin-2-yl)ethyl)-3H-imidazo[4,5-f]quinoline hydrochloride

Participants

Reaction Steps

To a solution of 2-(2-(quinoxalin-2-yl)ethyl)-3H-imidazo[4,5-f]quinoline (100 mg, 0.31 mmol) or 2-(2-(quinoxalin-2-yl)ethyl)-1H-imidazo[4,5-f]quinoline (60 mg, 0.18 mmol) in DMF (3 mL or 2 mL, respectively) cooled in an ice bath was added sodium hydride (12 mg, 0.31 mmol; or 7 mg, 0.18 mmol; respectively). After stirring for 30 minutes, iodomethane (44 mg, 0.31 mmol; or 25 mg, 0.18 mmol; respectively) was added and the mixture was stirred at room temperature for 2 hours. The reaction was quenched with water, washed with saturated sodium bicarbonate (10 mL), and extracted with DCM (20 mL×3). The combined organic layers were dried and concentrated to give a yellow solid as the free base. The free base may optionally be converted to a salt. For example, the free base was stirred in an HCl in methanol solution for 30 minutes to afford 3-methyl-2-(2-(quinoxalin-2-yl)ethyl)-3H-imidazo[4,5-f]quinoline hydrochloride (20 mg) or 1-methyl-2-(2-(quinoxalin-2-yl)ethyl)-M-imidazo[4,5-f]quinoline hydrochloride (25 mg) as a pale yellow solid.

Provenance & Evidence