The First Example of Palladium(II)-Catalyzed Oxidative C–N Cross Coupling of 2H-Imidazole 1-Oxide with Azoles
作者:Alexey A. Akulov、Mikhail V. Varaksin、Valery N. Charushin、Oleg N. Chupakhin
DOI:10.1007/s10593-019-02536-z
日期:2019.8
We report the firstexample of the direct nucleophilic C–H functionalization of cyclic aldonitrone, a derivative of 2H-imidazole 1-oxide, with 1H-imidazole and 3,5-dimethylpyrazole rings using oxidative C–N cross-coupling reactions in the presence of palladium(II) catalyst. The obtained new bisheterocyclic N-oxides may be of interest as molecules with potential biological activity and as functional
The methodology of direct C(sp2)–H functionalization has for the first time been applied as an efficient and advanced approach to carry out C–H/C–H coupling of 2H-imidazole 1-oxides and pyrroles. The atom-economical method used does not require either any auxiliary group in the starting substrates, or catalysis by transition metals. As a result, a number of novel 1H-pyrrol-2-yl-2H-imidazoles, that
Metal-Free C–H/C–H Coupling of 2<i>H</i>-Imidazole 1-Oxides with Polyphenols toward Imidazole-Linked Polyphenolic Compounds
作者:Timofey D. Moseev、Egor A. Nikiforov、Mikhail V. Varaksin、Valery N. Charushin、Oleg N. Chupakhin
DOI:10.1021/acs.joc.1c01796
日期:2021.10.1
The methodology of nucleophilic substitution of hydrogen (SNH) was successfully applied as a convenient synthetic tool to afford azaheterocyclic derivatives of phenols of various architectures. A series of 26 novel imidazole-linked polyphenolic compounds were first prepared in 72–95% yields through the direct metal-free C–H/C–H coupling of polyphenols with 2H-imidazole 1-oxides. Comprehensive studies
氢的亲核取代方法 (S N H ) 已成功用作方便的合成工具,以提供各种结构的苯酚的氮杂杂环衍生物。通过多酚与 2 H-咪唑 1-氧化物的直接无金属 C-H/C-H 偶联,首先以 72-95% 的产率制备了一系列 26 种新型咪唑连接的多酚化合物。对反应条件优化、范围和限制的综合研究使得开发出一种直接的方法来开发具有酚类和咪唑支架的新型双功能衍生物,在设计具有挑战性的分子以用于药物化学和材料科学的多功能应用方面特别感兴趣。
Palladium(II)-Catalyzed Oxidative C–H/C–H Coupling and Eliminative S<sub>N</sub><sup>H</sup> Reactions in Direct Functionalization of Imidazole Oxides with Indoles
作者:Mikhail V. Varaksin、Irina A. Utepova、Oleg N. Chupakhin、Valery N. Charushin
DOI:10.1021/jo301618b
日期:2012.10.19
Two novel synthetic approaches to realize the directC(sp2)–H bond functionalization in cyclic nitrones are reported. Palladium(II)-catalyzedoxidative C–C coupling of 2,2-dialkyl-4-phenyl-2H-imidazole 1-oxides with indoles was shown to result in the formation of 5-indolyl-3-yl derivatives, while nucleophilic substitution of hydrogen (SNH) at C(5) of the same imidazole system was found to afford the
Transition-Metal-Free C–H/C–Li Coupling of Nonaromatic 2<i>H</i>-Imidazole 1-Oxides with Pentafluorophenyl Lithium in the Design of Novel Fluorophores with Intramolecular Charge Transfer Effect
作者:Timofey D. Moseev、Mikhail V. Varaksin、Denis A. Gorlov、Valery N. Charushin、Oleg N. Chupakhin
DOI:10.1021/acs.joc.0c01042
日期:2020.9.4
Methodology of nucleophilic substitution of hydrogen (SNH) was first applied for the direct modification of nonaromatic 2H-imidazoles to afford novel polyfluoroarylated azaheterocycles. Scope, tolerance for these transition-metal-free C–H/C–Li coupling reactions, and photophysical properties for the novel 4-(perfluorophenyl)-5-aryl-2H-imidazoles were comprehensively studied. In particular, some of