HCID 57657258, compound → HCID 57657259, compound

Participants

Reaction Steps

A stirring solution of 1-{4-amino-2-(methoxymethyl)-7-[2-(methylsulfonyl)ethyl]-1H-imidazo[4,5-c]quinolin-1-yl}-2-methylpropan-2-ol (340 mg, 0.84 mmol) in dichloromethane (40 mL) was sealed with a septum and purged with nitrogen gas. The solution was cooled in an ice/water bath and a 1.0 M solution of boron tribromide in dichloromethane (4.2 mL) was added via syringe. The resulting mixture was stirred for 18 hours while warming to ambient temperature. The mixture was cooled back to 0° C. in an ice/water bath and the second portion of boron tribromide (1.0 M, 4.2 mL) was added. The reaction was stirred for 3 hours while warming to ambient temperature. Methanol (30 mL) was added and the mixture was concentrated to a purple foam. The foam was dissolved in 10% aqueous hydrochloric acid (30 ml) and washed with chloroform (2×25 mL). The aqueous fraction was neutralized by the slow addition of solid potassium carbonate until the pH reached 11. The aqueous fraction was extracted with chloroform (2×50 mL) and allowed to stand overnight. The resulting solid was recovered by filtration to provide 126 mg of 1-{4-amino-2-(hydroxymethyl)-7-[2-(methylsulfonyl)ethyl]-1H-imidazo[4,5-c]quinolin-1-yl}-2-methylpropan-2-ol

Provenance & Evidence