Potassium Carbonate → N-[(2,6-dichlorophenyl)carbonyl]-4-[1,6-dimethyl-4-(trifluoromethyl)-2-oxo-3-pyridinyl]-L-phenylalanine 2-[(N,N-diethyl)amino]ethyl ester

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To a mixture of N-[(2,6-dichlorophenyl)carbonyl]-4-[1,6-dimethyl-4-(trifluoromethyl)-2-oxo-3-pyridinyl]-L-phenylalanine (145 mg, 0.275 mmol), 2-diethylaminoethyl chloride hydrochloride (487 mg, 2.75 mmol) and potassium carbonate (380 mg, 2.7 mmol) was added ethyl acetate (3 mL) and water (3 mL) at room temperature. The mixture was stirred for 72 h at room temperature. Then, the reaction mixture was poured into a mixture of water (30 mL) and ethyl acetate (30 mL). The layers were separated and the aqueous layer was extracted with ethyl acetate (2×20 mL). The combined organic extracts were washed with brine solution (60 mL) and were dried over anhydrous magnesium sulfate. Filtration of the drying agent and concentration gave the crude product, which was purified by silica gel chromatography using a Biotage (40 s) column afforded 122 mg (71% yield) of N-[(2,6-dichlorophenyl)carbonyl]-4-[1,6-dimethyl-4-(trifluoromethyl)-2-oxo-3-pyridinyl]-L-phenylalanine 2-[(N,N-diethyl)amino]ethyl ester as an amorphous white solid. ES-HRMS m/e calcd for C30H32Cl2F3N3O4 (M+H) 626.1796. found 626.1802.

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