Oxalyl retro-peptide gelators. Synthesis, gelation properties and stereochemical effects
作者:Janja Makarević、Milan Jokić、Leo Frkanec、Vesna Čaplar、Nataša Šijaković Vujičić、Mladen Žinić
DOI:10.3762/bjoc.6.106
日期:——
In this work we report on gelation properties, self-assembly motifs, chirality effects and morphological characteristics of gels formed by chiral retro-dipeptidic gelators in the form of terminal diacids (1a-5a) and their dimethyl ester (1b-5b) and dicarboxamide (1c-5c) derivatives. Terminal free acid retro-dipeptides (S,S)-bis(LeuLeu) 1a, (S,S)-bis(PhgPhg) 3a and (S,S)-bis(PhePhe) 5a showed moderate
在这项工作中,我们报告了末端二酸(1a-5a)及其二甲酯(1b-5b)和二甲酰胺形式的手性反二肽胶凝剂形成的凝胶的凝胶特性、自组装基序、手性效应和形态特征(1c-5c)衍生物。末端游离酸逆向二肽 (S,S)-bis(LeuLeu) 1a、(S,S)-bis(PhgPhg) 3a 和 (S,S)-bis(PhePhe) 5a 对高极性水表现出中等至优异的胶凝作用/DMSO 和水/DMF 溶剂混合物。掺入不同氨基酸(S,S)-(LeuPhg) 2a 和(S,S)-(PhgLeu) 4a 的逆向肽没有显示出凝胶化或显示出非常弱的凝胶化。外消旋和单一对映体胶凝剂的胶凝效果不同。与纯手性 (S,S)-1c 相比,异手性 (S,R)-1c 非对映异构体能够固定多达 10 倍和 4 倍体积的二氯甲烷/DMSO 和甲苯/DMSO 溶剂混合物。基于非对映异构二酯 (S,S)-1b/(S,R)-1b 和二酸