4-Methylmorpholine → N-[2-(4-bromo-phenyl)-2-oxo-ethyl]-2-(3-isopropyl-2,5-dioxo-piperazin-1-yl)-acetamide

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Reaction Steps

HATU (3.70 g, 9.7 mmol) was added to a solution of 2-[2-({[2-(4-bromo-phenyl)-2-oxo-ethylcarbamoyl]-methyl}-amino)-acetylamino]-3-methyl-butyric acid (2.78 g, 6.5 mmol), and 4-methylmorpholine (3.57 mL, 32.5 mmol) in DMF (100 mL). After 30 min the solvent was removed under reduced pressure. The residue was taken up in dichloromethane (150 mL) and washed with water (50 mL), aqueous hydrogen chloride (0.5 N, 2×50 mL), saturated sodium bicarbonate (50 mL) and dried over sodium sulfate. The mixture was filtered and the solvent was removed under reduced pressure. The residue was subjected to flash chromatography with eluent of (10% methanol in ethyl acetate) and hexane. The product-containing fractions were combined and the solvent was removed under reduced pressure to yield N-[2-(4-bromo-phenyl)-2-oxo-ethyl]-2-(3-isopropyl-2,5-dioxo-piperazin-1-yl)-acetamide (1.56 g, 3.8 mmol, 60%). C17H20BrN3O4 calculated 409.1 observed [M+1]+ 410.1; rt=2.00 min.

Provenance & Evidence