Synthesis and characterization of a triazine dendrimer that sequesters iron(III) using 12 desferrioxamine B groups.

Synthesis and characterization of a triazine dendrimer that sequesters iron(III) using 12 desferrioxamine B groups.
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DOI:
10.1016/j.bmc.2010.05.039
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发表时间:
2010-08-01
影响因子:
3.5
通讯作者:
Simanek EE
Simanek EE
中科院分区:
医学3区
文献类型:
--
作者:
Lim J;Venditto VJ;Simanek EE

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合成了第三代三嗪树枝状大分子,1,含有多个,铁螯合去铁胺B(DFO)基团。DFO的异羟肟酸基团的苯甲酰化和反应性二氯三嗪的形成提供了用于与显示十二种胺的第二代树枝状聚合物反应的中间体。这种策略进一步推广了“功能单体”的方法,以产生生物活性的三嗪树枝状聚合物。树枝状聚合物1在七个步骤中以35%的总产率制备,并显示12个DFO基团,使其成为56重量%的药物。分光光度滴定(UV-Vis)表明,1螯合铁(III)原子既没有协同性,也没有显着的干扰树枝状聚合物的骨干。来自NMR光谱和质谱的证据揭示了这种功能单体方法的局限性:在偶联步骤期间发生从受保护的异羟肟酸到胺封端的树枝状聚合物的痕量O-到-N酰基迁移,导致N-苯甲酰化树枝状聚合物显示少于12个DFO基团。
The synthesis of a third generation triazine dendrimer, 1, containing multiple, iron-sequestering desferrioxamine B (DFO) groups is described. Benzoylation of the hydroxamic acid groups of DFO and formation of a reactive dichlorotriazine provide the intermediate for reaction with the second generation dendrimer displaying twelve amines. This strategy further generalizes the “functional monomer” approach to generate biologically active triazine dendrimers. Dendrimer 1 is prepared in seven steps in 35% overall yield and displays 12 DFO groups making it 56% drug by weight. Spectrophotometric titrations (UV-Vis) show that 1 sequesters iron(III) atoms with neither cooperativity nor significant interference from the dendrimer backbone. Evidence from NMR spectroscopy and mass spectrometry reveals a limitation to this functional monomer approach: trace amounts of O-to-N acyl migration from the protected hydroxamic acids to the amine-terminated dendrimer occurs during the coupling step leading to N-benzoylated dendrimers displaying fewer than 12 DFO groups.
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