Trifluoromethanesulfonic acid → HCID 10199786, compound

Participants

Reaction Steps

A round bottom flask was charged with a magnetic stir bar, N,N-dibenzyl-1-[4-(phenylsulfonyl)butyl]-1H-imidazo[4,5-c]quinolin-4-amine (1.0 g, 1.78 mmol), triflic acid (2.68 g, 17.83 mmol), and anhydrous dichloromethane (14 mL) under a nitrogen atmosphere. The reaction was judged to be complete after stirring at ambient temperature for 24 hours. The solution was partitioned between chloroform and excess aqueous sodium hydroxide (20%). The layers were separated. The aqueous layer was extracted with chloroform (3×). The organic layers were combined and then concentrated under reduced pressure to afford a light brown solid. The material was purified by chromatography over silica gel (90/10 dichloromethane/methanol) to provide a fine white powder which was recrystallized from acetonitrile to give 1-[4-(phenylsulfonyl)butyl]-1H-imidazo[4,5-c]quinolin-4-amine (0.32 g, 0.84 mmol) as white needles, m.p. 175-177° C.

Provenance & Evidence