HCID 57657224, compound → HCID 57657230, compound

Participants

Reaction Steps

A stirring solution of 3-[4-amino-1-(2-hydroxy-2-methylpropyl)-2-(methoxymethyl)-1H-imidazo[4,5-c]quinolin-7-yl]-N,N-dimethylpropanamide (523 mg, 1.31 mmol) in dichloromethane (125 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 (6.6 mL) was added via syringe. The resulting mixture was stirred for 18 hours while warming to ambient temperature. Methanol (50 mL) was added and the mixture was concentrated under reduced pressure. The resulting solid was dissolved in a 2.0 M solution of ammonia in methanol (75 mL) and the solution was concentrated under reduced pressure to yield a solid. This step was repeated two more times with silica gel (1 tbsp) being added prior to the final concentration. The sample absorbed on silica was purified by chromatography using a HORIZON HPFC system (silica cartridge, eluting with a CMA:chloroform gradient; 0-25% CMA over 1200 mL, followed by 25-40% CMA over 1300 mL) to provide 298 mg of 3-[4-Amino-2-(hydroxymethyl)-1-(2-hydroxy-2-methylpropyl)-1H-imidazo[4,5-c]quinolin-7-yl]-N,N-dimethylpropanamide as a white crystalline solid, mp 228-230° C.

Provenance & Evidence