Structure and Photophysical Properties of 2,6-Di-tert-Butyl-4-arylpyrylium 2-Naphthalenesulfonate Ion Pairs in Solution and in the Solid State
摘要:
2,6-Di-tert-butyl-4-arylpyrylium 2-naphthalenesulfonate salts form ion pairs in dimethylcarbonate solution that exhibit charge-transfer absorptions and result in the rapid quenching of the pyrylium fluorescence. Molecular mechanics calculations predict that these ion pairs exist in a T-shaped orientation, but X-ray structural analysis reveals a pi face-to-face arrangement in the solid state. Nuclear Overhauser effect and time-resolved spectroscopic experiments carried out in solution are consistent with a T-shape for the ion pair, but these experiments do not prove that this structural hypothesis is correct.
A facile approach to highly functional trisubstituted furans via intramolecular Wittig reactions
作者:Ko-Wei Chen、Siang-en Syu、Yeong-Jiunn Jang、Wenwei Lin
DOI:10.1039/c0ob00912a
日期:——
An efficient and mild synthesis of trisubstituted furans, starting from α,β-unsaturated ketones, tributylphosphine, and acyl chlorides, is described. The strategy employs the intramolecular Wittig protocol as a key step to install the crucial furan ring, leading to a wide variety of highly functional furans in one step.
Structure and Photophysical Properties of 2,6-Di-tert-Butyl-4-arylpyrylium 2-Naphthalenesulfonate Ion Pairs in Solution and in the Solid State
作者:Zhe Lin、Gary B. Schuster
DOI:10.1021/jo00084a033
日期:1994.3
2,6-Di-tert-butyl-4-arylpyrylium 2-naphthalenesulfonate salts form ion pairs in dimethylcarbonate solution that exhibit charge-transfer absorptions and result in the rapid quenching of the pyrylium fluorescence. Molecular mechanics calculations predict that these ion pairs exist in a T-shaped orientation, but X-ray structural analysis reveals a pi face-to-face arrangement in the solid state. Nuclear Overhauser effect and time-resolved spectroscopic experiments carried out in solution are consistent with a T-shape for the ion pair, but these experiments do not prove that this structural hypothesis is correct.
Discovery and Optimization of 1,3,5-Trisubstituted Pyrazolines as Potent and Highly Selective Allosteric Inhibitors of Protein Kinase C-ζ
作者:Mohammad Abdel-Halim、Britta Diesel、Alexandra K. Kiemer、Ashraf H. Abadi、Rolf W. Hartmann、Matthias Engel
DOI:10.1021/jm500521n
日期:2014.8.14
kinase C, PKCζ, might be a therapeutic target in pulmonary and hepatic inflammatory diseases. However, targeting the highly conserved ATP-binding pocket in the catalytic domain held little promise to achieve selective inhibition. In the present study, we introduce 1,3,5-trisubstituted pyrazolines as potent and selective allosteric PKCζ inhibitors. The rigid scaffold offered many sites for modification