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

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Reaction Steps

To a suspension of 4-(1-methyl-2-oxo-3-pyridinyl)-L-phenylalanine methyl ester hydrochloride salt (101 mg, 0.313 mmol), 2-chloro-6-methylbenzoic acid (60 mg, 0.35 mmol) and HBTU (133 mg, 0.35 mmol) in DMF (2 mL) was added DIEA (122 μL, 0.88 mmol) at room temperature. The resulting mixture was stirred for 15 h. Then, the mixture was poured into water (25 mL) and the organic compound was extracted into ethyl acetate (2×15 mL). The combined ethyl acetate extracts were washed successively with 0.5 N HCl (25 mL), saturated NaHCO3 solution (25 mL), brine solution (25 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 (40s) column to afford 122 mg (88% yield) of N-[(2-chloro-6-methylphenyl)carbonyl]-4-(1-methyl-2-oxo-3-pyridinyl)-L-phenylalanine methyl ester as an amorphous white solid. FAB-HRMS m/e calcd for C24H23ClN2O4 (M+H) 439.1425, found 439.1414

Provenance & Evidence