Acid-induced molecular-structural transformation of N -methyl aromatic oligoamides bearing pyridine-2-carboxamide
作者:Ryu Yamasaki、Saori Fujikake、Ai Ito、Kentaro Migita、Nobuyoshi Morita、Osamu Tamura、Iwao Okamoto
DOI:10.1016/j.tetlet.2015.11.058
日期:2016.1
Amide oligomers composed of pyridine-2-carboxamide as the repeating unit were synthesized in a step-wise manner and their structures were examined by means of H-1 NMR, NOE measurements, and DFT calculations. All the synthesized oligomers adopted a folded conformation, but became partially unfolded at the C-terminal upon addition of acid. A characteristic long-range hydrogen bond, which stabilizes local folding, was present in oligomers with a long main chain. (C) 2015 Elsevier Ltd. All rights reserved.