Sodium Iodide → 10-(2-Hydroxypropyl)-1,4,7,10-tetraazacyclododecane-1,4,7-triacetic acid

1,4,7,10-Tetraazacyclododecane-4,7,10-triacetic acid tri-t-butyl ester (129 mg, 0.25 mmol) (Example 22(a) ) was dissolved in dimethylformamide. Sodium iodide (7.5 mg, 0.5 mmol), triethylamine (76 mg, 0.75 mmol) and 3-chloro-2-propanol (48 mg, 0.5 mmol) were added to the stirred mixture at ambient temperature. The mixture was stirred for 4 hours at ambient temperature, the temperature was then raised to 100° C. and kept there for 2 hours. The solvent was evaporated, and the residue was dissolved in dichloromethane (2 ml) and washed with water (1 ml). Trifluoroacetic acid (2 ml) was added to the organic phase and the mixture was stirred at ambient temperature for 1 hour. The solvents were evaporated and the residue dissolved in water (4 ml). The aqueous solution was washed with ether (5×2 ml). The aqueous solution was acidified, the water was evaporated, and the title compound was isolated as a hygroscopic white powder. Yield 75 mg (74%) The structure was confirmed by 1HNMR and 13CNMR.

1. temperaturethe temperature was then raised to 100° C.
2. waitkept there for 2 hours
3. customThe solvent was evaporated
4. dissolutionthe residue was dissolved in dichloromethane (2 ml)
5. washwashed with water (1 ml)
6. additionTrifluoroacetic acid (2 ml) was added to the organic phase
7. stirringthe mixture was stirred at ambient temperature for 1 hour
8. customThe solvents were evaporated
9. dissolutionthe residue dissolved in water (4 ml)
10. washThe aqueous solution was washed with ether (5×2 ml)
11. customthe water was evaporated

ORD record

ord-9cb41687c6a448f2af24a576b842a460

Source dataset

uspto-grants-1995_05

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US05419893