Morpholine → HCID 57657217, compound

Participants

Reaction Conditions

Reaction Steps

3-[4-Amino-1-(2-hydroxy-2-methylpropyl)-1H-imidazo[4,5-c]quinolin-7-yl]propanoic acid (500 mg, 1.5 mmol), anhydrous N,N-dimethylformamide (25 mL), and 1-hydroxybenzotriazole (250 mg, 1.8 mmol) were combined and the reaction was stirred for 15 minutes. 1-(3-Dimethylaminopropyl)-3-ethylcarbodiimide (350 mg, 1.8 mmol) was added and the reaction mixture was stirred for an additional 30 minutes. Morpholine (400 mg, 2.3 mmol) was added to the reaction slurry. After five hours 1-hydroxybenzotriazole (250 mg, 1.8 mmol), 1-(3-Dimethylaminopropyl)-3-ethylcarbodiimide (350 mg, 1.8 mmol), and morpholine (400 mg, 2.3 mmol) were added and the mixture was heated at 70° C. for 2 hours. After cooling to ambient temperature, the solvent was removed under reduced pressure and the residue was partitioned between chloroform (100 ml) and 1% aqueous sodium carbonate (50 mL). The fractions were separated and organic fraction was washed 1% aqueous sodium carbonate (2×50 mL). The combined aqueous fractions were back extracted with chloroform (50 mL). The combined organic fractions were dried (MgSO4), filtered, and concentrated under reduced pressure. The resulting off-white solid was purified by chromatography using a HORIZON HPFC system (silica cartridge, eluting with a CMA:chloroform gradient; 0-5% CMA over 75 mL, 5-35% over 1500 mL, and 35% for 600 mL) followed by recrystallization from acetonitrile to provide 335 mg of 3-[4-amino-1-(2-hydroxy-2-methylpropyl)-1H-imidazo[4,5-c]quinolin-7-yl]-1-(morpholin-4-yl)propan-1-one as an off-white solid, mp 217-218° C.

Provenance & Evidence