Covalent Reinforcement of Hydrogen-Bonded Discs into Stably Folded Helical Structures
摘要:
The presence of covalent tethers significantly enhanced the stability of structures consisting of helically arranged benzenetricarboxamide units that otherwise undergo very weak hydrogen-bonding interaction. The resultant molecular structures were probed by computational study, which predicted folded conformations consisting of helically arranged discs. Experimental studies confirmed the H-bonding interaction between the disk units, the monomeric nature of the corresponding molecules in solution, and the helical conformations of such molecules.
Periodic change in absorption maxima due to different chain packing between the bilayers of amphiphiles possessing even and odd numbers of carbons in the hydrophobic chain
Supramolecular enantiomeric and structural differentiation of amino acid derivatives with achiral pillar[5]arene homologs
作者:Jiecheng Ji、Yizhou Li、Chao Xiao、Guo Cheng、Kui Luo、Qiyong Gong、Dayang Zhou、Jason J. Chruma、Wanhua Wu、Cheng Yang
DOI:10.1039/c9cc08541f
日期:——
Complexation of achiral pillar[5]arenes with chiral amines induced strong circular dichroism (CD) signals. The CD responses differed drastically depending on the nature of the aminoacid guest, and they significantly varied and part of them even inverted, upon increasing the length of the alkyl chains of the pillar[5]arenes guests. Accordingly, this tactic allowed for the unprecedented simultaneous
[EN] PHOSPHONATES, MONOPHOSPHONAMIDATES, BISPHOSPHONAMIDATES FOR THE TREATMENT OF VIRAL DISEASES<br/>[FR] PHOSPHONATES, MONOPHOSPHONAMIDATES, BISPHOSPHONAMIDATES POUR TRAITER DES MALADIES VIRALES
申请人:GILEAD SCIENCES INC
公开号:WO2005066189A1
公开(公告)日:2005-07-21
Compounds and compositions of Formula (I) are described, useful as anti-proliferative agents, and in particular anti-HPV.
D-N-Acetyl amino acid esters were obtained via enantioselective hydrolysis of their racemates by use of fermenting yeast. Evidence is given that proteinases are the enzymes involved.
Polyisocyanides Derived from Tripeptides of Alanine
作者:Gerald A. Metselaar、P. J. Hans M. Adams、Roeland J. M. Nolte、Jeroen J. L. M. Cornelissen、Alan E. Rowan
DOI:10.1002/chem.200600928
日期:2007.1.12
Helical polymers of isocyanotripeptides derivedfromalanine have been synthesized and their architectures studied in detail. The helical conformation of the polyisocyanotripeptides is stabilized by internal hydrogen-bonding arrays between the tripeptide side chains. The possibility of extending the well-defined hydrogen-bonded array, from dipeptide to tripeptide side chains, depends strongly on the stereochemistry
Enforced Tubular Assembly of Electronically Different Hexakis(<i>m</i>-Phenylene Ethynylene) Macrocycles: Persistent Columnar Stacking Driven by Multiple Hydrogen-Bonding Interactions
作者:Yulong Zhong、Yi Yang、Yi Shen、Wenwu Xu、Qiuhua Wang、Alan L. Connor、Xibin Zhou、Lan He、Xiao Cheng Zeng、Zhifeng Shao、Zhong-lin Lu、Bing Gong
DOI:10.1021/jacs.7b09647
日期:2017.11.8
having backbones of different electronicproperties, are designed to probe the effectiveness of multiple H-bonding interactions in enforcing columnar assemblies. 1H NMR, absorption, fluorescence, and circular dichroism (CD) spectroscopy indicate that, compared with analogous macrocycles that self-associate based on aromatic stacking which is highly sensitive to the electronic nature of the macrocyclic