β-Pseudopeptide foldamers. The homo-oligomers of (4R)-(2-oxo-1,3-oxazolidin-4-yl)-acetic acid (D–Oxac)
作者:Gianluigi Luppi、Roberta Galeazzi、Marco Garavelli、Fernando Formaggio、Claudia Tomasini
DOI:10.1039/b405856a
日期:——
A total synthesis in solution and a conformational analysis of the homo-oligomers of (4R)-(2-oxo-1,3-oxazolidin-4-yl)-acetic acid (DâOxac) to the tetramer level are described. As the DâOxac building block contains both an oxazolidin-2-one and a β-amino acid group, it may represent a new type of conformationally constrained tool for the construction of β-pseudopeptide foldamers. A conformational investigation using NMR and an extensive, unconstrained analysis with a Monte Carlo search to the octamer level, both in water and in chloroform, showed that these homo-oligomers tend to fold in a regular helical structure in a competitive solvent, such as water. Since aqueous solutions are of major relevance for biological systems, these molecules are good candidates for application to these environments.
描述了(4R)-(2-氧-1,3-噁唑烷-4-基)乙酸(D–Oxac)的同系物的总合成和构象分析,直至四聚体水平。由于D–Oxac构建块同时包含氧噁唑烯-2-酮和β-氨基酸基团,它可能代表了一种新型的构象受限工具,用于构建β-拟肽折叠体。通过NMR进行的构象研究以及在水和氯仿中进行的广泛无约束的蒙特卡洛搜索分析显示,这些同系物在竞争溶剂(如水)中倾向于折叠成规则的螺旋结构。由于水溶液在生物系统中具有重要意义,这些分子是适用于这些环境的良好候选者。