Dimethyl iminodiacetate hydrochloride

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A solution of 66.8 g (100 mmol) of 5-methoxyacetyl-amino-2,4,6-triiodoisophthalic acid dichloride (EP 0 015 867) in 300 ml of anhydrous N,N-dimethylformamide is mixed with 21.75 g (110 mmol) of iminodiacetic acid dimethyl ester hydrochloride (synthesis according to Dubsky, Graenacher, Chem. Ber. 50, 1693 (1917)) and 30.5 ml (220 mmol) of triethylamine. A suspension results, which is stirred for 14 hours at room temperature under argon. The batch is taken up in dichloromethane, shaken out once with water, twice with 2N aqueous citric acid and once with aqueous sodium bicarbonate solution. The organic phase is dried on anhydrous magnesium sulfate and concentrated by evaporation in a vacuum. By instilling tert-butyl ether in the concentrated solution, the title compound can precipitate as crystalline solid, which is suctioned off and dried in a vacuum. A suspension results The organic phase is dried on anhydrous magnesium sulfate concentrated by evaporation in a vacuum the title compound can precipitate as crystalline solid, which dried in a vacuum

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A solution of 66.8 g (100 mmol) of 5-methoxyacetyl-amino-2,4,6-triiodoisophthalic acid dichloride (EP 0 015 867) in 300 ml of anhydrous N,N-dimethylformamide is mixed with 21.75 g (110 mmol) of iminodiacetic acid dimethyl ester hydrochloride (synthesis according to Dubsky, Graenacher, Chem. Ber. 50, 1693 (1917)) and 30.5 ml (220 mmol) of triethylamine. A suspension results, which is stirred for 14 hours at room temperature under argon. The batch is taken up in dichloromethane, shaken out once with water, twice with 2N aqueous citric acid and once with aqueous sodium bicarbonate solution. The organic phase is dried on anhydrous magnesium sulfate and concentrated by evaporation in a vacuum. By instilling tert-butyl ether in the concentrated solution, the title compound can precipitate as crystalline solid, which is suctioned off and dried in a vacuum. A suspension results The organic phase is dried on anhydrous magnesium sulfate concentrated by evaporation in a vacuum the title compound can precipitate as crystalline solid, which dried in a vacuum

Conditions: temp:90.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A mixture of 1 mmol iminodiacetic acid dimethylester hydrochloride salt, 5 mmol N,N-diisopropyl-ethylamine and 3 mmol 1,3-dibromopropane in 2 mL toluene was stirred at 90° C. for 16 h and then chromatographed to provide the title compound as an oil. chromatographed

Conditions: temp:90.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A mixture of 1 mmol iminodiacetic acid dimethylester hydrochloride salt, 5 mmol N,N-diisopropyl-ethylamine and 3 mmol 1,3-dibromopropane in 2 mL toluene was stirred at 90° C. for 16 h and then chromatographed to provide the title compound as an oil. chromatographed

Conditions: temp:45.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Iminodiacetic dimethyl ester hydrochloride (624 mg, 3.24 mmol) was suspended in 5 mL of anhydrous DMF under nitrogen, and N-methylmorpholine (360 μL, 3.27 mmol) was added. After 5 minutes, 4-iodobenzoic acid (805 mg, 3.25 mmol) was added, followed by HOBt (450 mg, 3.33 mmol) and EDC (1.0 g, 5.28 mmol). The reaction was stirred overnight at 45° C. The solvent was removed and the residue was dissolved in EtOAc (20 mL) and washed with 0.5 M HCl, sat. NaHCO3 and water. The organic phase was collected, the solvent removed and the mixture purified by column chromatography (silica; hexanes:EtOAc 90:10-65:45), yielding the product as a white solid. MS (ES+): Cal'd. 392.00 (MH+), exp. 391.98 (MH+). The solvent was removed the residue was dissolved in EtOAc (20 mL) washed with 0.5 M HCl, sat. NaHCO3 and water The organic phase was collected the solvent removed the mixture purified by column chromatography (silica; hexanes:EtOAc 90:10-65:45)

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A solution of 66.8 g (100 mmol) of 5-methoxyacetylamino-2,4,6-triiodisophthalic acid dichloride (EP 0015867) in 300 ml of anhydrous N,N-dimethylformamide is mixed with 21.75 g (110 mmol) of iminodiacetic acid dimethyl ester-hydrochloride (synthesis according to Dubsky, Graenacher, Chem. Ber. 50, 1693 (1917)) and 30.5 ml (220 mmol) of triethylamine. A suspension results, which is stirred for 14 hours at room temperature under argon. The batch is taken up in dichloromethane, shaken out once with water, twice with 2n aqueous citric acid and once with aqueous sodium bicarbonate solution. The organic phase is dried on anhydrous magnesium sulfate and concentrated by evaporation in a vacuum. By instillation of tert-butyl ether in the concentrated solution, the title compound can be precipitated as crystalline solid, which is suctioned off and dried in a vacuum. A suspension results The organic phase is dried on anhydrous magnesium sulfate concentrated by evaporation in a vacuum By instillation of tert-butyl ether in the concentrated solution, the title compound can be precipitated as crystalline solid, which dried in a vacuum

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A solution of 66.8 g (100 mmol) of 5-methoxyacetyl-amino-2,4,6-triiodoisophthalic acid dichloride (EP 0 015 867) in 300 ml of anhydrous N,N-dimethylformamide is mixed with 21.75 g (110 mmol) of iminodiacetic acid dimethyl ester hydrochloride (synthesis according to Dubsky, Graenacher, Chem. Ber. 50, 1693 (1917)) and 30.5 ml (220 mmol) of triethylamine. A suspension results, which is stirred for 14 hours at room temperature under argon. The batch is taken up in dichloromethane, shaken out once with water, twice with 2N aqueous citric acid and once with aqueous sodium bicarbonate solution. The organic phase is dried on anhydrous magnesium sulfate and concentrated by evaporation in a vacuum. By instilling tert-butyl ether in the concentrated solution, the title compound can precipitate as crystalline solid, which is suctioned off and dried in a vacuum. A suspension results The organic phase is dried on anhydrous magnesium sulfate concentrated by evaporation in a vacuum the title compound can precipitate as crystalline solid, which dried in a vacuum

Conditions: temp:90.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A mixture of 1 mmol iminodiacetic acid dimethylester hydrochloride salt, 5 mmol N,N-diisopropyl-ethylamine and 3 mmol 1,3-dibromopropane in 2 mL toluene was stirred at 90° C. for 16 h and then chromatographed to provide the title compound as an oil. chromatographed