作者:Romina Wechsel、Julien Maury、Juliette Fremaux、Scott P. France、Gilles Guichard、Jonathan Clayden
DOI:10.1039/c4cc06754a
日期:——
The ability of urea-linked oligomers of achiral diamines (achiral analogues of the well-established chiral oligourea foldamers) to adopt helical conformations was explored spectroscopically. Up to four achiral units were ligated either to a well-formed helical trimer or to a single chiral diamine, and the extent to which they adopted a screw-sense preference was determined by NMR and CD. In the best performing cases, a trimeric chiral oligourea and even a single cis-cyclohexanediamine monomer induced folding into a helical conformation.
探讨了链脲连接的非手性二胺低聚物(已建立的手性低聚脲折叠体的非手性类似物)采用螺旋构象的能力,通过光谱学方法进行研究。将多达四个非手性单元连接到一个形成良好的螺旋三聚体或单个手性二胺上,利用NMR和圆二色性(CD)确定它们在多大程度上表现出螺旋手性偏好。在表现最佳的情况下,三聚体手性低聚脲甚至单个顺式环己烷二胺单体都诱导折叠成螺旋构象。