Highly Constrained Linear Oligopeptides Containing Heterocyclic<i>α</i>-Amino Carboxylic Acids
作者:Svetlana A. Stoykova、Anthony Linden、Heinz Heimgartner
DOI:10.1002/hlca.201300062
日期:2013.9
derivative, Tht‐Pro, respectively. By coupling of 4‐bromobenzoic acid with 1f or 1g and saponification, followed by repeating the coupling and saponification steps, oligopeptides of type 4‐BrBz‐(Thp‐Pro)n‐OMe and 4‐BrBz‐(Tht‐Pro)n‐OMe were prepared, and their conformations were evaluated in solution by NMR techniques and in the crystalline state by X‐ray crystallography. All of these sterically highly
两种螺杂环2 H-叠氮基3-胺1f和1g被证明是二肽N-(4-氨基四氢-2 H-吡喃-4-基)脯氨酸(Thp-Pro)和相应的噻喃的有用合成子派生工具Tht-Pro。通过将4-溴苯甲酸与1f或1g偶联并进行皂化,然后重复偶联和皂化步骤,可制得4-BrBz-(Thp-Pro)n -OMe和4-BrBz-(Tht-Pro)n型寡肽制备了OMe,并通过NMR技术在溶液中评估了其构象,并通过X射线晶体学对其结晶态进行了评估。所有这些在空间上高度拥塞的寡肽都具有相当刚性的螺旋构象。有趣的是,具有Thp的六肽形成3 10螺旋,而Tht类似物具有β弯曲带状螺旋确认。