Trimethyl orthoacetate → 2-methyl-1-{2-[2-(methylsulfonyl)ethoxy]ethyl}-1H-imidazo[4,5-c]quinoline

Participants

Reaction Steps

Trimethyl orthoacetate (1 g, 8.1 mmol) was added to a mixture of N4-{2-[2-(methylsulfonyl)ethoxy]ethyl}quinoline-3,4-diamine (˜2.3 g, ˜7.4 mmol) and toluene (45 mL). Pyridine hydrochloride (0.25 g) was added and the reaction mixture was heated to reflux with the volatiles being collected in a Dean Stark trap. Pyridine was added to help solubilize the starting material. After 2 hours the reaction mixture was concentrated under reduced pressure to provide a dark oil. This material was purified by column chromatography (silica gel eluting sequentially with 95/5 dichloromethane/methanol and 9/1 dichloromethane/methanol) to provide 1.75 g of 2-methyl-1-{2-[2-(methylsulfonyl)ethoxy]ethyl}-1H-imidazo[4,5-c]quinoline as a white foam.

Provenance & Evidence