Reacción #1929058

Ecuación de reacción

4-hydroxybenzoic acid

BOP

→

4-hydroxybenzamide

Disolventes

DMF

DMF

Condiciones de reacción

Tratamiento posterior

1. 1
   Otrothe DMF was removed by evaporation under reduced pressure
2. 2
   workup.DISSOLUTIONdissolved by addition of aqueous sodium hydroxide solution 1M (pH 11)
3. 3
   Otrosubjected to dialysis against water (1 L, 2 changes over 24 h)

Procedimiento

A solution of freshly prepared 4-hydroxybenzoic acid (635 mg; 4.6 mmol) and BOP (1.7 g; 5.06 mmol) in DMF (20 mL) was added dropwise and at room temperature to a solution of PEI (1 g, 23.2 mmol) in DMF (50 mL). After 2 hours under stirring, the DMF was removed by evaporation under reduced pressure. The crude product was taken in water, dissolved by addition of aqueous sodium hydroxide solution 1M (pH 11) and subjected to dialysis against water (1 L, 2 changes over 24 h). Lyophilization provided 4-hydroxybenzamide-PEI (0.7 g) at a modification degree of 28%. 1H NMR (D2O) δppm: 2.6 (bm, 2.9H, —NHCH2CH2NH—), 3.22 (m, 0.55H, Phe-CONHCH2CH2NH—), 3.35 (m, 0.55H, Phe-CONHCH2CH2NH) 6.57 (d, J=7.3 Hz, 0.55H, CHaro), 6.97 (m, 0.55H, CHaro).

Fuente