Studies on the interactions of 5-<i>R</i>-3-(2-pyridyl)-1,2,4-triazines with arynes: inverse demand aza-Diels–Alder reaction <i>versus</i> aryne-mediated domino process
作者:Dmitry S. Kopchuk、Igor L. Nikonov、Albert F. Khasanov、Kousik Giri、Sougata Santra、Igor S. Kovalev、Emiliya V. Nosova、Sravya Gundala、Padmavathi Venkatapuram、Grigory V. Zyryanov、Adinath Majee、Oleg N. Chupakhin
DOI:10.1039/c8ob00847g
日期:——
aza-Diels–Alder products or 1,2,4-triazine ring rearrangement (domino) products as major ones depending on the nature of both the substituents at the C5 position of the 1,2,4-triazine core or in the aryne moiety. The structures of the key products were confirmed based on X-ray data. Based on the density functional theoretical (DFT) studies of the Diels–Alder transitionstate geometries, the influence of the nature
已经研究了取代的5 - R -3-(吡啶基-2)-1,2,4-三嗪与原位生成的取代的芳烃中间体之间的相互作用。根据1,2,5碳原子上两个取代基的性质,反应可提供反需求(ID)的aza-Diels-Alder产品或1,2,4-三嗪环重排(domino)产品作为主要产品。 4-三嗪核或在芳烃部分。根据X射线数据确定了关键产品的结构。基于Diels–Alder过渡态几何的密度泛函理论(DFT)研究,提出了芳烃性质对1,2,4-三嗪转化方向的影响。
From 1,2,4-triazines towards substituted pyridines and their cyclometallated Pt complexes
作者:Valery N. Kozhevnikov、Maria M. Ustinova、Pavel A. Slepukhin、Amedeo Santoro、Duncan W. Bruce、Dmitry N. Kozhevnikov
DOI:10.1016/j.tetlet.2008.04.138
日期:2008.6
A new, efficient methodology for the synthesis of substituted thienylpyridines includes the synthesis of 3-thienyl-1,2,4-triazines using simple heterocyclisation followed by easy transformation of the triazine ring to a pyridine through an aza Diels–Alder approach. A variety of substituted pyridines can be easily achieved using cheap, commercially available reagents such as bromoacetylarenes, aroyl
Tandem oxidation processes for the regioselective preparation of 5-substituted and 6-substituted 1,2,4-triazines
作者:Surat Laphookhieo、Stuart Jones、Steven A. Raw、Yolanda Fernández Sainz、Richard J.K. Taylor
DOI:10.1016/j.tetlet.2006.03.178
日期:2006.6
undergo MnO2-mediated oxidation, followed by in situ trapping with 2-pyridylamidrazone, to give 3-pyridyl-5-substituted 1,2,4-triazines in a one-pot procedure, which avoids the need to isolate the reactive α-ketoaldehyde intermediates. By modifying this procedure to allow condensation prior to oxidation, the corresponding 6-substituted 1,2,4-triazines were obtained. The preparation of a novel unsymmetrical
The discovery of pyridinium 1,2,4-triazines with enhanced performance in bioconjugation reactions
作者:Sebastian J. Siegl、Rastislav Dzijak、Arcadio Vázquez、Radek Pohl、Milan Vrabel
DOI:10.1039/c6sc05442k
日期:——
A novel class of pyridinium 1,2,4-triazines with excellent properties for use in bioconjugation reactions was discovered from a systematic kinetic study.
Stable σH-adducts in reactions of ferrocenyllithium with azines
作者:I. A. Utepova、A. E. Lakhina、M. V. Varaksin、I. S. Kovalev、V. L. Rusinov、P. A. Slepukhin、M. I. Kodess、O. N. Chupakhin
DOI:10.1007/s11172-008-0292-4
日期:2008.10
Stable σH-adducts as intermediates of the nucleophilic substitution of hydrogen in 3-(2-pyridyl)-1,2,4-triazines were obtained for the first time using ferrocenyllithium as a nucleophilic reagent. The three-dimensional structures of the reaction products were established based on the X-ray diffraction study of 1-[4-ethyl-6-phenyl-3-(2-pyridyl)-5(H)-1,2,4-triazin-5-yl]ferrocene.