Water → (S)-(-)-5-[(2-Acetoxypropanoyl)amino]-2,4,6-triiodoisophthalic Acid

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(S)-1-chloro-1-oxopropan-2-yl acetate (0.75 ml, 5.91 mmol) was added drop-wise to a solution of 5-amino-2,4,6-triiodoisophthalic acid (1.0 g, 1.79 mmol) in DMA (5 ml). The resulting mixture was stirred at about 50° C. for 5 hours and 20 minutes. 80 ml of water was added to the reaction mixture at room temperature after which the suspension formed was cooled to a temperature between 0° C. and 5° C. and stirred for 25 minutes at this temperature. The suspension was filtered and the solid washed with water. The product was dried in a vacuum oven at 40° C. to yield (S)-5-(2-acetoxypropanamido)-2,4,6-triiodoisophthalic acid (0.695 g, 1.03 mmol). The MS, 1H-NMR and 13C-NMR data are consistent with the structure for (S)-5-(2-acetoxypropanamido)-2,4,6-triiodoisophthalic acid.

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