Porphyrin-core dendrimers consisting of benzyl ether dendrons assembled around a porphyrin core have been prepared by two different convergent syntheses. The first involves the direct condensation of convergent dendrons having 3,5-disubstituted benzaldehyde focal points with an equivalent amount of pyrrole. This route which requires very mild conditions is especially useful for the rapid assembly of small dendrimers but suffers from steric limitations as the size of the dendrons increases above the fourth generation. The second route involves the attachment of pre-formed benzyl bromide dendrons to a functionalized porphyrin through a simple Williamson synthesis. This route is also very practical but it requires careful purification of the final product from the partially functionalized porphyrin dendrimers that are also obtained. MALDI mass spectrometry proved to be a very useful tool both for monitoring the formation of the dendritic porphyrins and for their characterization.
通过两种不同的汇聚合成方法,制备了以
卟啉为核心,围绕着由
苯甲醚树枝状体组成的
卟啉核心树状大分子。第一种方法涉及具有3,5-二取代
苯甲醛焦点点的汇聚树枝状体的直接缩合,以及等量的
吡咯。这种方法需要在非常温和的条件下进行,对于快速组装小型树状大分子特别有用,但随着树枝状体尺寸超过第四代,会受到空间限制的影响。第二种方法涉及通过简单的Williamson合成将预先形成的苯甲基
溴树枝状体附着到功能化的
卟啉上。这种方法也非常实用,但需要仔细从也得到的局部功能化的
卟啉树状大分子中纯化最终产品。MALDI质谱分析被证明是监测树状
卟啉形成和其表征的非常有效的工具。