Реакция #219172

Уравнение реакции

N,N-bis-(2-aminoethyl)-5-(methylamino)-2,4,6-triiodoisophthalic acid amide

2-bromopropionic acid bromide

→

N,N-Bis-[2-(2-bromopropionylamino)ethyl)-5-[(2-bromopropionyl)methylamino]-2,4,6-triiodoisophthalic acid amide

Растворители

dimethylacetamide

Условия реакции

Обработка

1. 1
   Фильтрацияthe accumulating solid is filtered off
2. 2
   workup.DISSOLUTIONdissolved in 800 ml of ethyl acetate
3. 3
   Экстракцияextracted three times with 250 ml each of water
4. 4
   ДругоеThe organic phase is dried on sodium sulfate
5. 5
   Другоеthe solvent is evaporated to the dry state
6. 6
   ДругоеThe crude product is recrystallized from methyl-tert-butyl ether

Методика

50 g (76.1 mmol) of N,N-bis-(2-aminoethyl)-5-(methylamino)-2,4,6-triiodoisophthalic acid amide is dissolved in 500 ml of dimethylacetamide, and 75.5 g (350 mmol) of 2-bromopropionic acid bromide (Aldrich) is added in drops over 15 minutes at 0° C. Then, it is stirred for 20 hours at 40° C. The reaction mixture is poured into 4000 ml of ice water, the accumulating solid is filtered off, dissolved in 800 ml of ethyl acetate and extracted three times with 250 ml each of water. The organic phase is dried on sodium sulfate, and the solvent is evaporated to the dry state. The crude product is recrystallized from methyl-tert-butyl ether.

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