Ethyl 4-bromobutyrate → Ethyl 4-(((1R)-2-(5-(2-fluoro-3-methoxyphenyl)-3-(2-fluoro-6-(trifluoromethyl)benzyl)-4-methyl-2,6-dioxo-3,6-dihydro-1(2H)-pyrimidinyl)-1-phenylethyl)amino)butanoate

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To compound 3-[2(R)-amino-2-phenylethyl]-5-(2-fluoro-3-methoxyphenyl)-1-[2-fluoro-6-trifluoromethyl)benzyl]-6-methyl-pyrimidine-2,4(1H,3H)-dione 1f (5 g, 9.4 mmol) in 100 mL of acetonitrile were added ethyl 4-bromobutyrate (4 mL, 28.2 mmol) and Hunig's base (1.6 mL, 9.4 mmol). After reflux at 95° C. overnight, the reaction mixture was cooled to ambient temperature and the volatiles were removed. The residue was chromatographed with 10:10:1 EtOAc/Hexane/Et3N to give 1g as a yellow oil (3.0 g, 4.65 mmol). MS (CI) m/z 646.2 (MH+).

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