Reaktion #82438

Reaktionsgleichung

NaOH

bromoacetic acid

NaOH

α-[(phenylmethoxy)methyl]-1,4,7,10-tetraazacyclododecan-1-acetamide trihydrochloride

NaOH

→

desired product

Ausbeute 150.0%

10-[2-[[2-(2-hydroxyethoxy)ethyl]amino]-2-oxo-1-[(phenylmethoxy)methyl]ethyl]-1,4,7,10-tetraazacyclododecan-1,4,7-triacetic acid

Ausbeute 150.0%

Lösungsmittel

H2O

H2O

Reaktionsbedingungen

Aufarbeitung

1. 1
   TemperaturThe reaction mixture is heated to 50° C. for 48 h
2. 2
   TemperaturAfter cooling at room temperature
3. 3
   Filtrationthe mixture is filtered on a MilliporeR
4. 4
   Filtrationfilter
5. 5
   workup.ADDITIONdiluted to 1.5 L with H2O
6. 6
   Einengenis concentrated under vacuum
7. 7
   Sonstigeto give an oily residue which
8. 8
   Sonstigeto give a glassy solid
9. 9
   SonstigeThe solid is triturated
10. 10
    workup.DISSOLUTIONdissolved with AcOEt (200 mL)
11. 11
    Filtrationfiltered
12. 12
    Sonstigedried again
13. 13
    workup.DISSOLUTIONThe crude product is dissolved in H2O (150 mL)
14. 14
    Waschena gradient elution with H2O-MeOH
15. 15
    workup.ADDITIONThe fractions containing the pure product
16. 16
    Sonstigeare collected
17. 17
    Einengenconcentrated under vacuum

Vorschrift

To a solution of 45.5 g of bromoacetic acid (0.327 mol) in 140 mL of H2O, kept under stirring at 0° C., 31.5 mL of 10N NaOH (0.315 mol) are added in 1 h to pH 6. The resulting solution is added drop by drop to a solution of 46 g of N-[2-(2-hydroxyethoxy)ethyl)]-α-[(phenylmethoxy)methyl]-1,4,7,10-tetraazacyclododecan-1-acetamide trihydrochloride (0.084 mol) in H2O (100 mL) and, at a constant reaction temperature of 0° C., 10N NaOH is slowly added to pH 10. The reaction mixture is heated to 50° C. for 48 h and 50 mL of 10N NaOH (0.5 mol) are added to keep a constant pH of 10. After cooling at room temperature, the mixture is filtered on a MilliporeR filter, neutralized with 37%HCl (w/w), diluted to 1.5 L with H2O and electrodialyzed. When the electrodialysis is over, the solution is concentrated under vacuum to give an oily residue which is placed into a drier to give a glassy solid. The solid is triturated and dissolved with AcOEt (200 mL), filtered and dried again. The crude product is dissolved in H2O (150 mL) and percolated on Amberlite® XAD 16 resin (1000 mL) performing a gradient elution with H2O-MeOH. The fractions containing the pure product are collected and concentrated under vacuum to give 38.83 g of the desired product (0.063 mol).

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