Sodium Bicarbonate → HCID 18429137, compound

Participants

Reaction Steps

5-Amino-3-acetoxymethyl-N,N-bis-(2,3-diacetoxypropyl)-2,4,6-triiodobenzamide, 6.85 mmol) was dissolved in dry N,N-dimethylacetamide (10 ml) and the mixture was cooled in an ice-bath. 2-Acetoxy-5-chloropentanoyl chloride (4.36 g, mmol) was then added dropwise. The mixture was stirred at room temperature for 24 h, and then added slowly to aqueous sodium hydrogen carbonate (5%, 600 ml) with efficient stirring. A precepitate was formed and filtered off, redissolved in methylene chloride (250 ml) which was washed with water (6×70 ml), dried Na2SO4) and concentrate in vacuo. The residue was chromatographed on a column of silica gel using heptane/ethyl acetate (3/7) as the eluent Yield: 7.30 g (97%).

Provenance & Evidence