Triethylamine → 1-{4-amino-7-[2-(methylsulfonyl)ethenyl]-1H-imidazo[4,5-c]quinolin-1-yl}-2-methylpropan-2-ol

Participants

Reaction Conditions

Reaction Steps

A thick walled glass tube, equipped with a stir bar, was charged with palladium (II) acetate (15 mg, 0.07 mmol), acetonitrile (50 mL), methyl vinyl sulfone (268 mg, 2.52 mmol), triethylamine (1.00 mL, 7.17 mmol), tri-o-tolylphosphine (45 mg, 0.21 mmol) and 1-(4-amino-7-bromo-1H-imidazo[4,5-c]quinolin-1-yl)-2-methylpropan-2-ol (800 mg, 2.39 mmol). The reaction mixture was purged with nitrogen and the tube was sealed and heated at 120° C. in an oil bath. The reaction was maintained at 120° C. for 12 hours, cooled to ambient temperature, and then concentrated under reduced pressure to yield a dark brown oil. The oil was partitioned between chloroform (75 mL) and a solution comprised of a 1:1 combination of 10% aqueous potassium carbonate and 10% sodium hydroxide. A precipitate formed. The mixture was filtered and the recovered solid was purified by chromatography using a HORIZON HPFC system (silica cartridge, eluting with 20% methanol in dichloromethane. The filtrate was also concentrated and the residue purified by chromatography using a HORIZON HPFC system (silica cartridge, eluting with a 0-8% gradient of methanol in dichloromethane). The two lots of purified product were combined to provide 380 mg of 1-{4-amino-7-[2-(methylsulfonyl)ethenyl]-1H-imidazo[4,5-c]quinolin-1-yl}-2-methylpropan-2-ol as a pale yellow solid. MS (APCI) m/z 361 (M+H)+.

Provenance & Evidence