One‐Pot and Two‐Chamber Methodologies for Using Acetylene Surrogates in the Synthesis of Pyridazines and Their D‐Labeled Derivatives
作者:Maria S. Ledovskaya、Mikhail V. Polynski、Valentine P. Ananikov
DOI:10.1002/asia.202100562
日期:2021.8.16
Acetylene surrogates are efficient tools in modern organic chemistry with largely unexplored potential in the construction of heterocyclic cores. Two novel synthetic paths to 3,6-disubstituted pyridazines were proposed using readily available acetylene surrogates through flexible C2 unit installation procedures in a common reaction space mode (one-pot) and distributed reaction space mode (two-chamber):
乙炔替代物是现代有机化学中的有效工具,在构建杂环核方面具有很大的潜力。在常见的反应空间模式(一锅)和分布式反应空间模式(两室)中,通过灵活的 C 2单元安装程序,提出了使用现成的乙炔替代物制备 3,6-二取代哒嗪的两种新型合成途径: (1) 1,2,4,5-四嗪及其受体官能化衍生物与 CaC 2 -H 2的相互作用在两室反应器中进行的 O 混合导致相应的哒嗪定量收率;(2) 1,2,4,5-四嗪与苄基乙烯基醚的[4+2]环加成可被认为是合成多种哒嗪的通用途径。在开发的程序中用 D 2 O 和乙烯基醚及其三氘代类似物代替水,首次合成了一系列 95-99% 氘化度的 4,5-双氘代哒嗪。量子化学建模允许量化两种合成途径中的取代效应。
Synthesis and Properties of New Tetrazines Substituted by Heteroatoms: Towards the World's Smallest Organic Fluorophores
Newtetrazinessubstituted by heteroatoms have been synthesized and their electrochemical and photochemical properties investigated. All compounds are reversibly electroactive with standard potentials shifting cathodically according to the donor character of the substituent. The tetrazine derivatives are also fluorescent with maximum emission wavelengths in the range 550-575 nm. Some of them show very
the synthesis, photophysical and electrochemicalproperties and their interplay, and our theoretical calculations. These molecules are composed of two fluorophores, an electron-rich triphenylamine unit and an electron-poor tetrazine unit. Although the bichromophores are not fluorescent in the neutral state due to a photoinduced electron transfer from the triphenylamine unit to the tetrazine unit, one
Synthesis and characterization of various 5′-dye-labeled ribonucleosides
作者:Coralie De Schutter、Vincent Roy、Patrick Favetta、Corentin Pavageau、Stéphane Maisonneuve、Nicolas Bogliotti、Juan Xie、Luigi A. Agrofoglio
DOI:10.1039/c8ob01606b
日期:——
5-tetrazine, dicyanomethylene-4H-pyran, benzophenoxazinone, 9,10-anthraquinone and azobenzene chromophores, were prepared mainly under Cu-catalyzed azide–alkyne cycloaddition (CuAAC). The design criteria are outlined. Several derivatives possess in supplement a fluorescence property. The absorption and fluorescence spectra of all coloured nucleosides were recorded to study their potential as visible-range