使用化学,制备了简单的大环假肽动力学系统,该系统包含类似于已知的铵阳离子受体的环状结构。测试了一系列铵盐作为模板,并根据使用的模板以不同程度扩增了预期的受体。与冠醚的竞争性非共价相互作用被用来原位证明模板化系统仍然是动态的。ESI-MS和1 H ROESY实验证明了客体-客体复合物的形成。各种模板对分离的受体的相对亲和力与它们对文库组成产生的作用密切相关。
使用化学,制备了简单的大环假肽动力学系统,该系统包含类似于已知的铵阳离子受体的环状结构。测试了一系列铵盐作为模板,并根据使用的模板以不同程度扩增了预期的受体。与冠醚的竞争性非共价相互作用被用来原位证明模板化系统仍然是动态的。ESI-MS和1 H ROESY实验证明了客体-客体复合物的形成。各种模板对分离的受体的相对亲和力与它们对文库组成产生的作用密切相关。
A cyclic pseudo-peptide receptor for acetylcholine has been amplified and isolated from a dynamiccombinatoriallibrary by virtue of templated stabilization under thermodynamic control (see scheme, TFA=trifluoroacetic acid). This is a demonstration of significant molecular amplification in dynamic systems to evolve a novel receptor.
Photoswitchable Dynamic Combinatorial Libraries: Coupling Azobenzene Photoisomerization with Hydrazone Exchange
作者:Lindsey A. Ingerman、Marcey L. Waters
DOI:10.1021/jo801783w
日期:2009.1.2
The novel azobenzene-based monomer 1 was prepared, equipped with the necessary functionality to undergo simultaneous dynamic exchange processes: hydrazone exchange and photoisomerization. Acid-promoted hydrolysis of the azobenzene building block produced a dynamic combinatorial library of cyclic oligomers, while multibuilding block libraries were also generated upon addition of proline-based monomers. Libraries equilibrated under thermal conditions were dominated by trans isomers of the azobenzene macrocycles, whereas light-induced isomerization resulted in a conformational change of the library members to their corresponding cis-azo form. In the presence of a pentaproline template, a slower rate of thermal relaxation of the cis-azobenzene species 1(c) was observed, resulting in stabilization and amplification of this receptor due to favorable binding interactions. The facile identification and application of such photoswitchable receptors have the potential to allow for greater control over molecular recognition events.