Structural Properties and Stereochemically Distinct Folding Preferences of 4,5‐
<i>cis</i>
and
<i>trans</i>
‐Methano‐
<scp>L</scp>
‐Proline Oligomers: The Shortest Crystalline PPII‐Type Helical Proline‐Derived Tetramer
作者:Gilles Berger、Miguel Vilchis‐Reyes、Stephen Hanessian
DOI:10.1002/anie.201506208
日期:2015.11.2
synthesis, structural properties, and folding patterns of a series of L‐proline methanologues represented by cis‐ and trans‐4,5‐methano‐L‐proline amides and their oligomers are reported as revealed by X‐ray crystallography, circular dichroism measurements, and DFT calculations. We disclose the first example of a crystalline tetrameric proline congener to exhibit a polyproline II helical conformation
X射线晶体学,圆二色性测量表明,以顺式和反式-4,5-甲基-L-脯氨酸酰胺为代表的一系列L-脯氨酸甲醇类似物的合成,结构性质和折叠模式和DFT计算。我们公开了显示聚脯氨酸II螺旋构象的结晶四聚脯氨酸同类物的第一个实例。反映反酰胺的n→π*稳定程度的理论计算结果证明了顺式-4,5-甲基-L-脯氨酸低聚物的PPII型螺旋排列(溶液形式和固态形式)的实验证据构象。