On cyclization of 2-chloro-N-phenacylpyridinium ylides by the action of aryldiazonium salts
作者:Maxim A. Topchiy、Eugene V. Babaev
DOI:10.1007/s10593-016-1955-y
日期:2016.9
The reaction of 2-chloro-N-phenacylpyridinium salts with diazoniumsalts in the presence of bases was studied for the first time. It was demonstrated that this reaction leads to the formation of [1,2,4]triazolo[4,3-a]pyridinium salts. It was shown that substitution of the pyridine with a thiazole moiety leads to a similar cyclization.
首次研究了在碱存在下2-氯-N-苯并吡啶鎓盐与重氮盐的反应。已证明该反应导致[1,2,4]三唑并[4,3- a ]吡啶鎓盐的形成。已表明用噻唑部分取代吡啶导致类似的环化。
New mesoionic systems of the azolopyridine series. 1. Synthesis and structures of thiazolo[3,2-a]pyridinium 2-thiolates
作者:E. V. Babaev、V. B. Rybakov、I. A. Orlova、A. A. Bush、K. V. Maerle、A. F. Nasonov
DOI:10.1023/b:rucb.0000024847.21876.b0
日期:2004.1
A procedure was developed for the synthesis of representatives of the previously unknown bicyclic mesoionic thiazolo[3,2-a]pyridinium 2-thiolate system by the reaction of 2-X-N-phenacylpyridinium salts (X = Cl, SMe) with CS2 in the presence of Et3N. The three-dimensional structure of 3-(p-nitrobenzoyl)thiazolo[3,2-a]pyridinium 2-thiolate was established by X-ray diffraction analysis.
Cyclopenta[a]quinolizine: A Novel Pseudoazulene with a Bridgehead Nitrogen Atom
作者:Pavel V. Gormay、Victor B. Rybakov、Eugene V. Babaev
DOI:10.1002/ejoc.201000753
日期:——
Cyclopenta[a]quinolizine, a novel tricyclic pseudoazulene, was prepared by reaction of cyclopentadienyllithium with oxazolo[3,2-a]pyridinium or substituted pyridinium salts. Structural analysis (X-ray analysis, NMR and UV spectroscopy) and DFT calculations confirm its highly dipolar nature (due to delocalization of the negative charge around the five-membered ring) combined with partial localization
New mesoionic systems of azolopyridine series 2. Synthesis, structures, and biological activity of 2-aminothiazolo[3,2-a]pyridinium salts and thiazolo[3,2-a]pyridinium 2-imidates
作者:E. V. Babaev、A. A. Bush、I. A. Orlova、V. B. Rybakov、I. Iwataki
DOI:10.1007/s11172-005-0242-3
日期:2005.1
A new procedure was developed for the synthesis of 2-aminothiazolo[3,2-a]pyridiniumsalts 8 by the reaction of 2-halo-N-phenacylpyridinium salts with KSCN. The anion compositions of salts 8 were studied by ion chromatography. Acylation of salts 8 afforded representatives of the previously unknown bicyclic mesoionic thiazolo[3,2-a]pyridinium 2-imidate system 9. The three-dimensional structures of 2
A self-[3+2] annulation reaction of pyridinium salts has been developed for the synthesis of N-indolizine-substituted pyridine-2(1H)-ones. This protocol was carried out under mild reaction conditions without any precious catalysts in generally moderate to good yields. Additionally, a plausible mechanism for the transformation was proposed.
吡啶鎓盐的自[3+2] 环化反应已被开发用于合成N-中氮茚取代的吡啶-2(1 H )-酮。该方案是在温和的反应条件下进行的,没有任何贵重的催化剂,产率通常适中。此外,还提出了一种合理的转化机制。