Evaluation of stereochemically dense morpholine-based scaffolds as proline surrogates in β-turn peptides
作者:Filippo Sladojevich、Antonio Guarna、Andrea Trabocchi
DOI:10.1039/b913444a
日期:——
Four peptides differing for the structure of the new morpholine-based heterocyclic compound acting as a turn inducer were synthesized in solution phase, and the conformational preferences were assessed by means of NMR analysis. All spectroscopic data revealed an adaptive behaviour of the turn peptides in generating turn conformations stabilized by intramolecular hydrogen-bonds, despite the conformational changes of the turn inducer. Thus, this study suggests the possibility of functionalizing morpholine-containing β-turn peptides with no significant loss of the secondary framework. The 3,4-dihydro-2H-[1,4]oxazine-containing peptide showed a more compact structure stabilized by an additional γ-turn-forming hydrogen-bond experienced by the Gly amide proton.
在溶液相中合成了四种结构不同的新型吗啉基杂环化合物作为转角诱导剂,并通过核磁共振分析评估了其构象偏好。所有光谱数据都揭示了转角肽在产生由分子内氢键稳定的转角构象方面的适应性行为,尽管转角诱导物发生了构象变化。因此,这项研究表明,在不显着损失二级框架的情况下,可以对含吗啉的β-转角肽进行功能化。 3,4-二氢-2H-[1,4] 含恶嗪肽显示出更紧凑的结构,通过甘氨酰胺质子经历的额外γ-转角形成氢键稳定。