2,6-Dichlorobenzoyl chloride → N-[(2,6-dichlorophenyl)carbonyl]-4-[1,6-dimethyl-4-(trifluoromethyl)-2-oxo-3-pyridinyl]-L-phenylalanine methyl ester

Beteiligte Stoffe

Reaktionsschritte

To a suspension of 4-[1,6-dimethyl-4-(trifluoromethyl)-2-oxo-3-pyridinyl]-L-phenylalanine methyl ester hydrochloride salt (150 mg, 0.37 mmol) and 2,6-dichlorobenzoyl chloride (85 mg, 0.4 mmol) in dichloromethane (6 mL) was added DIEA (257 μL, 1.48 mmol) at room temperature. After 5 min, a clear solution was obtained which was stirred for 48 h. Then, the mixture was concentrated and the residue was dissolved in ethyl acetate (50 mL). The ethyl acetate solution was washed with 0.5 N HCl (50 mL), saturated NaHCO3 solution (50 mL) and brine solution (50 mL) and was dried over anhydrous magnesium sulfate. Filtration of the drying agent and concentration gave crude product, which was purified by silica gel chromatography on a Biotage (40 m) column to give 190 mg (95% yield) of N-[(2,6-dichlorophenyl)carbonyl]-4-[1,6-dimethyl-4-(trifluoromethyl)-2-oxo-3-pyridinyl]-L-phenylalanine methyl ester as an amorphous white solid. ES-HRMS m/e calcd for C25H21Cl2F3N2O4 (M+Na) 563.0724. found 563.0726. f) Preparation of N-[(2,6-dichlorophenyl)carbonyl]-4-[1,6-dimethyl-4-(trifluoromethyl)-2-oxo-3-pyridinyl]-L-phenylalanine

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