Reaktion #434952

Reaktionsgleichung

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

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

ethyl 4-bromobutyrate

Hunig's base

→

1g

Ausbeute 49.5%

3-[2(R)-{ethoxycarbonylpropyl-amino}-2-phenylethyl]-5-(2-fluoro-3-methoxyphenyl)-1-[2-fluoro-6-(trifluoromethyl)benzyl]-6-methyl-pyrimidine-2,4(1H,3H)-dione

Ausbeute 49.5%

Lösungsmittel

acetonitrile

Reaktionsbedingungen

Aufarbeitung

1. 1
   Temperaturthe reaction mixture was cooled to ambient temperature
2. 2
   Sonstigethe volatiles were removed
3. 3
   SonstigeThe residue was chromatographed with 10:10:1 EtOAc/Hexane/Et3N

Vorschrift

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+).

Quelle