General Synthesis of Unsymmetrical Norbornane Scaffolds as Inducers for Hydrogen Bond Interactions in Peptides,
摘要:
Starting from readily accessible endo-cis-(2S,3R)-norbornene dicarboxylic acid benzyl monoester, a general and efficient synthetic approach toward unsymmetrical two-stranded peptidic structures was developed. In these structures the peptide strands are oriented in a parallel geometry. Their synthesis is easily applicable to a variety of amino acids and peptides. Specifically, a norbornane template as molecular scaffold induces hydrogen bonding between the adjacent peptide strands. The specific hydrogen bonding patterns between these strands were revealed by detailed NMR analysis including TOCSY/NOE experiments.
Modification of polyhedral oligomeric silsesquioxane derivatives with heck reaction as possible new bio-hybrid materials
作者:Omer Tahir Gunkara
DOI:10.1080/10426507.2019.1576678
日期:2019.9.2
AbstractThe regioselective synthesis of Polyhedral oligomeric silsesquioxane (POSS)-based norbornyl imide derivatives through palladium catalyzed Heck couplingreaction was reported on an effective...
Norbornene chaotropic salts as low molecular mass ionic organogelators (LMIOGs)
作者:Jordan R. Engstrom、Aramballi J. Savyasachi、Marzieh Parhizkar、Alessandra Sutti、Chris S. Hawes、Jonathan M. White、Thorfinnur Gunnlaugsson、Frederick M. Pfeffer
DOI:10.1039/c8sc01798k
日期:——
norbornene (9:Na) functions as a potent, low molecular-mass (MW = 333 Da) ionic organogelator with a minimum gelating concentration of 0.5 wt% in THF, i-PrOH, 1,4-dioxane and n-BuOH. Fibrous crystals form in the gel and X-ray crystallography identified a cation mediated helical assembly process controlled by the chirality of the phenylalanine. In addition to excellent gelating properties 9:Na readily