反应详情

5-Chloropentanoyl chloride (5.1 g, 33 mmol) was added dropwise to a stirred solution of N,N'-bis[2,3-bis(acetyloxy)propyl]-5-amino-2,4,6-triiodo-1,3-benzenedicarboxamide (20.5 g, 23 mmol) in N,N'-dimethylacetamide (75 ml) at 0°-5°. The reaction mixture was stirred at 5° for 1 hour, and then at room temperature for 30 hours. The solvent was removed in vacuo and the residue was dissolved in ethyl acetate (250 ml). The solution was washed with water (2×50 ml), followed by saturated aqueous NaCl (50 ml), and then dried over anhydrous sodium sulfate. Removal of the solvent in vacuo gave N,N'-bis[2,3-bis(acetyloxy)propyl]-5-[(5-chloro-1-oxopentyl)amino]-2,4,6-triiodo-1,3-benzenedicarboxamide as an off-white fluffy solid (22.1 g, yield 97%, purity 98.5%).

1. waitat room temperature for 30 hours
2. customThe solvent was removed in vacuo
3. dissolutionthe residue was dissolved in ethyl acetate (250 ml)
4. washThe solution was washed with water (2×50 ml)
5. dry with materialdried over anhydrous sodium sulfate
6. customRemoval of the solvent in vacuo