Cesium carbonate → methyl 4-(5-{[(2S,4R)-4-[acetyl(4-chlorophenyl)amino]-2-methyl-3,4-dihydroquinolin-1(2H)-yl]carbonyl}-2-fluorophenoxy)-2,2-dimethylbutanoate

Participants

Reaction Steps

N-(4-chlorophenyl)-N-[(2S,4R)-1-(4-fluoro-3-hydroxybenzoyl)-2-methyl-1,2,3,4-tetrahydroquinolin-4-yl]acetamide (476 mg, 1.05 mmol) was dissolved in DMF at room temperature and Cs2CO3 (854 mg, 2.63 mmol) was added. Methyl 4-bromo-2,2-dimethylbutanoate (702 mg, 1.58 mmol) was added and the reaction was stirred at r.t. overnight. The reaction mixture was concentrated under reduced pressure. The residue was partitioned between ethyl acetate and water, then extracted three times with ethyl acetate, dried over MgSO4, filtered and concentrated down. The crude residue was purified by silica gel chromatography (hexanes-ethyl acetate system) to afford methyl 4-(5-{[(2S,4R)-4-[acetyl(4-chlorophenyl)amino]-2-methyl-3,4-dihydroquinolin-1(2H)-yl]carbonyl}-2-fluorophenoxy)-2,2-dimethylbutanoate (286 mg, 52%).

Provenance & Evidence