反应详情

5-Amino-3-acetoxymethyl-N-(2,3-diacetoxypropyl)-2,4,6-triiodobenzamide (30.0 g, 40.3 mmol) was dissolved in dry N,N-dimethylacetamide (50 ml) and added dropwise to 2,3,4-triacetoxybutanoyl bromide (26.0 g, 0.93 mol) at 0° C. The mixture was stirred at ambient temperature for 5 h, and then added slowly to an aqueous solution of NaHCO3 (5%, 500 ml). A semi-crystalline precipitate was formed, filtered off and dissolved in ethyl acetate (200 ml). The organic phase was washed three times with diluted HCl (5%, 80 ml) and then twice with water (80 ml). After drying (Na2SO4) the solvent was evaporated to a semisolid residue. The residue was purified on a column of silica using methylene chloride/acetonitrile (4:1-3:2) as the eluent. The solvent was evaporated and the residue was further purified by preparative HPLC to give 13.8 g (35%) of the product.

1. customA semi-crystalline precipitate was formed
2. filtrationfiltered off
3. dissolutiondissolved in ethyl acetate (200 ml)
4. washThe organic phase was washed three times with diluted HCl (5%, 80 ml)
5. dry with materialAfter drying (Na2SO4) the solvent
6. customwas evaporated to a semisolid residue
7. customThe residue was purified on a column of silica
8. customThe solvent was evaporated
9. customthe residue was further purified by preparative HPLC