Tri-o-tolylphosphine → 2-ethyl-7-[(1E)-3-morpholin-4-yl-3-oxoprop-1-enyl]-1-(tetrahydro-2H-pyran-4-ylmethyl)-1H-imidazo[4,5-c]quinolin-4-amine

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A thick walled glass vessel, equipped with a stir bar, was charged with a warmed solution of 7-bromo-2-ethyl-1-(tetrahydro-2H-pyran-4-ylmethyl)-1H-imidazo[4,5-c]quinolin-4-amine (584 mg, 1.5 mmol) in N,N-dimethylformamide (10 mL). To the solution was added in succession, a solution of palladium acetate (37 mg, 0.15 mmol) and tri-ortho-tolylphosphine (91 mg, 0.3 mmol) in N,N-dimethylformamide (5 mL), triethylamine (0.6 mL), and a solution of 4-acryloylmorpholine (254 mg 1.8 mmol) in N,N-dimethylformamide (2 mL). The reaction mixture was purged with nitrogen. The vessel was sealed and heated at 120° C. for 18 hours. The reaction was cooled to ambient temperature and then concentrated to dryness under reduced pressure. The resulting solid was dissolved in dichloromethane (100 mL) and washed with saturated aqueous potassium carbonate (50 mL). The fractions were separated and the organic fraction was concentrated to dryness under reduced pressure. The resulting solid was purified by chromatography using a HORIZON HPFC system (silica cartridge, 0-15% CMA/chloroform). A final recrystallization from acetonitrile provided 345 mg of 2-ethyl-7-[(1E)-3-morpholin-4-yl-3-oxoprop-1-enyl]-1-(tetrahydro-2H-pyran-4-ylmethyl)-1H-imidazo[4,5-c]quinolin-4-amine as a white crystalline solid, mp>260° C.

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