Synthesis and Structural Characterization of Homochiral Homo-oligomers of Parent cis- and trans-Furanoid-β-Amino Acids
作者:Sunil K. Pandey、Ganesh F. Jogdand、João C. A. Oliveira、Ricardo A. Mata、Pattuparambil R. Rajamohanan、Chepuri V. Ramana
DOI:10.1002/chem.201101855
日期:2011.11.11
The synthesis of homochiral homo‐oligomers of cis‐ and trans‐3‐aminotetrahydrofuran‐2‐carboxylic acids (parent cis‐ and trans‐furanoid‐β‐amino acids, referred to as “cis‐/trans‐FAA”) has been carried out to understand their secondary structures and their dependence on the ring heteroatom. The oligomers of two diastereomers have been shown to have a distinct left‐handed helicity. The cis‐FAA homo‐oligomers
进行了顺式和反式-3-氨基四氢呋喃-2-羧酸(母体顺式和反式呋喃酮-β-氨基酸,称为“顺式/反式FAA”)的同手性均聚物的合成了解它们的二级结构及其对环杂原子的依赖性。两种非对映异构体的寡聚体已显示出独特的左旋螺旋度。所述顺-FAA均-寡聚物显示出14螺旋结构,在对比的均-寡聚物顺-ACPC来说,在采用像结构的薄片。该反式发现FAA均聚物采用12螺旋结构,与反式ACPC均聚物的趋势相同。借助于从头算,比较了顺式ACPC和顺式FAA六聚体的结构特征。我们认为,顺式-FAA六肽的堆积更为紧凑,这应归因于环与主链酰胺氢之间更有利的相互作用。