Dichloromethane → (R)-tert-Butyl 4-(2-(5-(2-(3-fluoro-4-(trifluoromethyl)phenyl)acetamido)-6-methyl-1-oxoisoquinolin-2(1H)-yl)propyl)piperazine-1-carboxylate

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A mixture of (R)-2-(5-(2-(3-fluoro-4-(trifluoromethyl)phenyl)acetamido)-6-methyl-1-oxoisoquinolin-2(1H)-yl)propyl methanesulfonate (100 mg, 0.0002 mol), tert-butyl 1-piperazinecarboxylate (100 mg, 0.0006 mol), triethylamine (200 mg, 0.002 mol) and methylene chloride (6 mL, 0.09 mol) was stirred at room temperature overnight. The solvents were removed under reduced pressure and the residue was purified by flash chromatography to afford the desired product as a light yellow oil (100 mg, 60%).

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