Potassium Carbonate → N,N'-Bis-[2,3-diacetyloxypropyl]-5-[3-bromo-2-oxo-1-pyrrolidinyl]2,4,6-triiodo-1,3-benzenedicarboxamide

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A solution of N,N'-bis-[2,3-diacetyloxypropyl]-5-amino-2,4,6-triiodo-1,3-benzenedicar boxamide (8.73 g, 10 mmol) in N,N-dimethylacetamide (100 ml) was treated with 2,4-dibromobutyroyl bromide (4.02 g, 13.0 mmol) under an atmosphere of nitrogen and the reaction mixture was stirred for 50 hours at ambient temperature. The mixture was then treated with ground potassium carbonate (1.65 g, 12.0 mmol) and stirred for 30 minutes at ambient temperature. An additional portion (1.65 g, 12.0 mmol) of finely ground potassium carbonate was added and the mixture was stirred for 1.9 hours. The suspended salts were filtered and the solvent was evaporated to obtain a brown oil. This crude product was purified by silica gel flash chromatography to isolate N,N'-Bis-[2,3-diacetyloxypropyl]-5-[3-bromo-2-oxo-1-pyrrolidinyl]2,4,6-triiodo-1,3-benzenedicarboxamide, as a white powder (7.28 g, 71% yield), m.p. 110°-112°.

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