Diisopropylethylamine → N-[(2-ethyl-6-methylphenyl)carbonyl]-4-[1,6-dimethyl-4-(trifluoromethyl)-2-oxo-3-pyridinyl]-L-phenylalanine methyl ester

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A mixture of the above prepared acid chloride, 4-[1,6-dimethyl-4-(trifluoromethyl)-2-oxo-3-pyridinyl]-phenylalanine methyl ester hydrochloride (100 mg, 0.25 mmol) in dichloromethane (5 mL) was treated with DIPEA (0.17 mL, 1.0 mmol) and the resulting light brown solution was stirred for 3 days. The mixture was concentrated, diluted with ethyl acetate, washed with 1 N HCl and brine solution and was dried over magnesium sulfate. Filtration and evaporation afforded a residue, which was purified by silica gel chromatography using a Biotage column (40 s) to give N-[(2-ethyl-6-methylphenyl)carbonyl]-4-[1,6-dimethyl-4-(trifluoromethyl)-2-oxo-3-pyridinyl]-L-phenylalanine methyl ester as a white foam (79 mg, 62%). ES-HRMS m/e calcd for C28H29F3NO4 (M+Na) 537.1974. found 537.1972. d. Preparation of N-[(2-ethyl-6-methylphenyl)carbonyl]-4-[1,6-dimethyl-4-(trifluoromethyl)-2-oxo-3-pyridinyl]-L-phenylalanine

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