反应详情

To a mixture of (S)-3-[4-(2,6-dichlorobenzoylamino)phenyl]-2-(2,6-dichloro-4-hydroxy-benzoylamino)propionic acid methyl ester (5.05 g, 9.07 mmol), 3-tert-butoxycarbonylaminopropyl bromide (2.59 g, 10.89 mmol), and potassium carbonate (3.77 g, 27.29 mmol) were added DMF (66 mL) and acetone (132 mL) at room temperature. Then, the resulting suspension was heated to reflux for 15 h at which time TLC analysis indicated the absence of starting material. Then, the reaction mixture was cooled to room temperature and diluted with water and the organic compound was extracted into ethyl acetate (2×150 mL). The combined organic layer was washed with brine solution and dried over anhydrous MgSO4. Filtration and concentration gave the crude residue which was purified by ISCO (150 g) column chromatography to obtain 5.75 g (89%) of (S)-2-[4-(3-tert-butoxycarbonylaminopropoxy)-2,6-dichlorobenzoylamino]-3-[4-(2,6-dichlorobenzoylamino)phenyl]propionic acid methyl ester as a white solid. ES(+)-HRMS m/e calcd. for C32H33Cl4N3O7 (M+Na)+ 734.0965, obsd. 734.0961.

1. temperatureThen, the resulting suspension was heated
2. temperatureto reflux for 15 h at which time TLC analysis
3. extractionthe organic compound was extracted into ethyl acetate (2×150 mL)
4. washThe combined organic layer was washed with brine solution
5. dry with materialdried over anhydrous MgSO4
6. filtrationFiltration and concentration
7. customgave the crude residue which
8. customwas purified by ISCO (150 g) column chromatography