反应详情

A solution of sodium sulfanilic acid (195 mg; 1 mmol) in dry DMSO (3 ml) was added dropwise to a solution of N,N′-disuccinimidyl carbonate (530 mg; 2 mmol) in dry DMSO (4 ml) and the resulting brownish solution stirred at room temperature for 20 hours. A solution of PAMAM 4.0 (EDA) (75 mg; 0.011 mmol) in dry DMSO (1 ml) added and the solution stirred for a further 18 hours. The solution was then concentrated under high vacuum (10−5 mmHg; 35°) to give a yellowish semi solid. The crude product was dissolved in DMSO (4 ml) and the solution added to 200 ml of well stirred ethyl acetate. The precipitated white solid was collected by filtration and washed with ethyl acetate (2×) and ether (2×), then dried to give a white powder (275 mg). This material was further purified by gel filtration (Sephadex LH20; water) to give PAMAM 4.0 (EDA) terminated with 32 sodium 4-sulfophenylurea groups (106 mg). 1H nmr (D2O): 62.31; 2.55; 2.75; 3.19; 7.32 (d, J=9 Hz); 7.63 (d, J=9 Hz). 13C nmr (D2O): δ 36.3; 40.7; 43.3; 43.8; 53.7; 55.7; 123.3; 130.9; 140.9; 146.0; 161.4; 178.2; 178.6.

1. stirringthe solution stirred for a further 18 hours
2. concentrationThe solution was then concentrated under high vacuum (10−5 mmHg; 35°)
3. customto give a yellowish semi solid
4. filtrationThe precipitated white solid was collected by filtration
5. washwashed with ethyl acetate (2×) and ether (2×)
6. customdried