反应详情

3,5-Diaminobenzoic acid (4.3 mg, 0.028 mmol, 0.40 equiv.) was dissolved in 10 mL of anhydrous DMF. To the solution was added H-PEOZ-p-NPC 10K (1.00 gm, 0.0692 mmol, 1.0 equiv.; an active NHS ester can also be used), followed by addition of N,N-Diisopropylethyl amine (DIPEA, 36.2 μL, 0.208 mmol, 3.0 equiv.). Following overnight stirring at room temperature, the solution was evaporated to dryness by rotary evaporation under vacuum at 50° C. The residue was dissolved in dichloromethane, and then precipitated by addition into diethyl ether with stirring. The precipitate was filtered and dried under vacuum. The molecular weight of H-PEOZ2-benzoic acid was verified by GPC.

1. customthe solution was evaporated to dryness by rotary evaporation under vacuum at 50° C
2. dissolutionThe residue was dissolved in dichloromethane
3. customprecipitated by addition into diethyl ether
4. stirringwith stirring
5. filtrationThe precipitate was filtered
6. customdried under vacuum