Persulfonylation of Amines Applied to the Synthesis of Higher Generation Dendrimers
摘要:
Systematic analysis of the persulfonylation of branched aromatic oligoamines with different arylsulfonyl chlorides allowed optimization of the repetitive steps involved in the synthesis of the sulfonimide-based dendrimers. The optimized procedures afforded the fourth generation N- and pentaphenylene-centered dendrimers with 16 and 32 peripheral groups, respectively. Analysis of products of incomplete substitution showed that the amino groups in aromatic oligoamines are persulfonylated consecutively.
报道了在每个分支点处具有磺酰亚胺单元的“设计者”树枝状聚合物和树枝状化合物的合成。该合成基于胺和磺酰胺的一系列(区域)选择性官能化反应,可以精确控制树枝状聚合物的形状、每一代的支链数量及其外围用官能团修饰。原则上,结构上不同的分支可以随意结合在树枝状聚合物结构内的任何位置。在制备规模上合成了结构完美的对称和两面“Janus”型树枝状聚合物,以及具有预期间隙的树枝状聚合物和树枝状聚合物,并对其进行了充分表征。在 Suzuki 交叉偶联反应的帮助下,在其焦点处带有芳基溴官能团的各代低聚磺酰亚胺树枝状化合物连接到对亚苯基核,从而产生具有光活性三联苯核的树枝状聚合物。所有树枝状磺酰亚胺的结构和高纯度均通过 (1) H 和 (13) C NMR、电喷雾电离质谱 (ESI-MS) 和元素分析证实。与电喷雾电离相比,评估了 MALDI-TOF 质谱对这些树枝状聚合物的分析表征的效用。通过单晶 X 射线分
作者:Dirk Schubert、Mirza Corda、Oleg Lukin、Boris Brusilowskij、Evgenij Fiškin、Christoph A. Schalley
DOI:10.1002/ejoc.200800408
日期:2008.8
A topological approach to the analysis of isomericdendrimers by considering their molecular graphs has been applied to correlate various properties of a series of new sulfonimide-based isomericdendrimers with their structures. According to this approach isomericdendrimers are referred to as either isographic, that is, having the same graph, or non-isographic, that is, having different graphs. Six