反应详情

2,6-Dioxo-morpholine-4-carboxylic acid tert-butyl ester (2.5 g, 11.6 mmol) was added to a solution of 2-amino-1-(4-bromo-phenyl)-ethanone hydrochloride (3.05 g, 12.2 mmol) and 4-methylmorpholine (1.92 mL, 17.4 mmol) in dimethylformamide (15 mL). After 30 min the solvent was removed under reduced pressure. The residue was taken up in ethyl acetate (100 mL) and washed with water (50 mL), aqueous hydrogen chloride (0.5 N, 2×50 mL), and saturated sodium bicarbonate (2×50 mL). The basic extracts were neutralized and extracted with ethyl acetate (2×75 mL). The combined organic phases from the second extraction were dried over sodium sulfate, and filtered. The solvent was removed under reduced pressure to provide ({[2-(4-bromo-phenyl)-2-oxo-ethylcarbamoyl]-methyl}-tert-butoxycarbonyl-amino)-acetic acid (4 g, 9.3 mmol, 80%). C17H21BrN2O6 calculated 428.0 observed [M+1]+ 431.1; rt=2.36 min.

1. customAfter 30 min the solvent was removed under reduced pressure
2. washwashed with water (50 mL), aqueous hydrogen chloride (0.5 N, 2×50 mL), and saturated sodium bicarbonate (2×50 mL)
3. extractionextracted with ethyl acetate (2×75 mL)
4. extractionThe combined organic phases from the second extraction
5. dry with materialwere dried over sodium sulfate
6. filtrationfiltered
7. customThe solvent was removed under reduced pressure