N,N'-Bis[2-(acetyloxy)-1-[(acetyloxy)methyl]ethyl]-5-amino-2,4,6-triiodo-1,3-benzenedicarboxamide → N,N'-Bis[2-(acetyloxy)-1-[(acetyloxy)methyl]ethyl]-5-[(2-propenyloxy)acetyl]amino-2,4,6-triiodo-1,3-benzenedicarboxamide

Participants

Reaction Conditions

Reaction Steps

Allyloxyacetyl chloride (9.0 g, 67 mmol) was added dropwise to a stirred solution of N,N'-bis[2-(acetyloxy)-1-[(acetyloxy)methyl]ethyl]-5-amino-2,4,6-triiodo-1,3-benzenedicarboxamide (30.0 g, 34 mmol) in N,N-dimethylacetamide (70 ml) at 0°-5° C. The reaction mixture was stirred at 5° C. for 30 minutes and at room temperature for 20 hours. It was then slowly added dropwise to a well stirred mixture of ice-water (1.5 L), when a white solid separated out. This was collected by filtration, washed with water, and dried in vacuo to obtain N,N'-Bis[2-(acetyloxy)-1-[(acetyloxy)methyl]ethyl]-5-[(2-propenyloxy)acetyl]amino-2,4,6-triiodo-1,3-benzenedicarboxamide as a white amorphous solid (32.1 g, 97% yield), m.p. 214°-16°.

Provenance & Evidence