Peptide analogs containing the pentacyclo[5,4,0,02,6,03,6,05,9]undecane scaffold: conformational analysis in solution
作者:Mariane Axt、Hassan Oulyadi、Xavier Pannecoucke、Jean-Charles Quirion、Adriana R. Pohlmann、Valentim E.U. Costa
DOI:10.1016/j.molstruc.2003.10.018
日期:2004.2
hydrogen-bonded ring for each peptide chain. In a strong solvating medium such as DMSO-d6 the depsipeptide (±)- 12 adopts a γ-like strand hydrogen-bonded ring for one peptide chain and, for the other one, a bifurcated H-bond formed by a γ-like strand and a non-classical C5-structure. Theoretical calculations, supported by the experimental data, made it possible to identify these conformations and were of great
摘要 为了评估附着在多环化合物上的缩肽的构象偏好,我们通过 NMR 光谱研究了溶液中的构象偏好,并通过动态模拟、半经验和 ab initio 计算研究了理论领域的构象偏好。在CDCl 3 溶液中,多环支架8和10显示出不同类型的转角构象,而化合物9、11、(±)-12和(±)-13显示出明确定义的转角结构,分别以8-成员氢键环和每个肽链的γ-样链氢键环。在 DMSO-d6 等强溶剂化介质中,缩酚肽 (±)- 12 的一条肽链采用 γ 样链氢键环,而另一条肽链采用由 γ 样链形成的分叉 H 键和一个非经典的 C5 结构。