Methanol → HCID 57657241, compound

Participants

Reaction Steps

A stirring solution of 1-[4-amino-2-(methoxymethyl)-7-(3-morpholin-4-yl-3-oxopropyl)-1H-imidazo[4,5-c]quinolin-1-yl]-2-methylpropan-2-ol (460 mg, 1.04 mmol) in chloroform (120 mL) was sealed with a septum and purged with nitrogen gas. The solution was cooled in an ice water bath and a solution of 1.0 M boron tribromide in dichloromethane (6.6 mL) was added via syringe. The reaction was stirred for 18 hours while warming to ambient temperature. In order to complete the reaction three additional portions (3 mL, 10 mL, and 10 mL) of 1.0 M boron tribromide in dichloromethane were added at approximately 18 hour intervals. Methanol (75 mL) was added. The reaction was concentrated to a dark purple liquid and then stirred in 10% aqueous hydrochloric acid (100 mL) for three days. Solid sodium carbonate was slowly added until the pH equaled 10. The solution was concentrated to a white solid. The solid was washed with methanol (2×100 mL) and filtered. The filtrate was absorbed onto silica (2 tbsp) and then purified by chromatography using a HORIZON HPFC system (silica cartridge, eluting with a CMA:chloroform gradient; 0-20% CMA over 1400 mL, followed by 20-30% CMA over 1600 mL) to provide 48 mg of 1-[4-amino-2-(hydroxymethyl)-7-(3-morpholin-4-yl-3-oxopropyl)-1H-imidazo[4,5-c]quinolin-1-yl]-2-methylpropan-2-ol as a white crystalline solid, mp 223-225° C.

Provenance & Evidence