Triethylamine → 3-[3-(5-Chloro-2-{2-[4-(4-fluoro-benzyl)-(2R)-2-methyl-piperazin-1-yl]-2-oxo-ethoxy}-phenyl)-ureido]-propionic Acid Methyl Ester

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To a solution of (5-chloro-2-{2-[4-(4-fluoro-benzyl)-(2R)-2-methyl-piperazin-1-yl]-2-oxo-ethoxy}-phenyl)-carbamic acid 4-nitro-phenyl ester (0.10 g, 0.18 mmol) in methanol was added β-alanine methyl ester hydrochloride (0.038 g, 0.27 mmol) and triethylamine (0.038 mL, 0.27 mmol). The reaction was stirred at ambient temperature overnight. The reaction was concentrated and purified via chromatography on silica gel to give the title compound (0.075 g).

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