有效地实现了布朗斯台德酸介导的内烯烃α-氧代乙烯酮二硫缩醛与吡咯的环化反应,得到环戊[ b ]吡咯。一对具有酸强度的布朗斯台德酸,即三氟乙酸和对甲苯磺酸水合物,被用于促进环化反应。生成的产物很容易被间氯过氧苯甲酸氧化成砜。随后用1,8-二氮杂双环[5.4.0]十一碳-7-烯处理得到脱硫的烯烃中间体脱硫的末端烯烃或[2 + 2]环加成产物。本协议提供了在温和条件下易于访问结构多样的环戊[ b ]吡咯衍生物的方法。
A case of chain propagation: α-aminoalkyl radicals as initiators for aryl radical chemistry
作者:Timothée Constantin、Fabio Juliá、Nadeem S. Sheikh、Daniele Leonori
DOI:10.1039/d0sc04387g
日期:——
The generation of aryl radicals from the corresponding halides by redox chemistry is generally considered a difficult task due to their highly negative reduction potentials. Here we demonstrate that α-aminoalkyl radicals can be used as both initiators and chain-carriers for the radical coupling of aryl halides with pyrrole derivatives, a transformation often employed to evaluate new highly reducing
Palladium-Catalyzed Decarboxylative Cross-Coupling Reaction Between Heteroaromatic Carboxylic Acids and Aryl Halides
作者:François Bilodeau、Marie-Christine Brochu、Nicolas Guimond、Kris H. Thesen、Pat Forgione
DOI:10.1021/jo9022793
日期:2010.3.5
A full overview of the decarboxylative cross-coupling reaction between heteroaromatic carboxylic acids and aryl halides is described. This transformation employs palladium catalysts with short reaction times providing facile synthesis of aryl-substituted heteroaromatics. The effect of each reaction parameter including solvent, base, and additive employed as well as the full substrate scope of this
Brønsted Acid-Promoted Cascade Alkylation/Cyclization of Pyrroles with<i>N</i>,<i>N</i>-Dimethylaminomethyleneglutaconic Acid Dinitrile: A Concise Route to Cyclopenta[<i>b</i>]pyrroles
A Brønstedacid (p-TsOH⋅H2O) promoted alkylation/cyclizationcascade reaction of pyrroles with N,N-dimethylaminomethyleneglutaconicaciddinitrile was efficiently realized to afford functionalized cyclopenta[b]pyrroles with excellent diastereoselectivity. Deamination of the corresponding ammonium salts of the cyclopenta[b]pyrroles with methyl iodide led to dihydrocyclopenta[c]pyrroles. The cascade reaction
有效地实现了布朗斯台德酸(p -TsOH·H 2 O)促进吡咯与N,N-二甲基氨基亚甲基戊二酸二腈的烷基化/环化级联反应,从而提供具有优异非对映选择性的官能化环戊[ b ]吡咯。环戊[ b ]吡咯的相应铵盐与甲基碘的脱氨基反应生成二氢环戊[ c ]吡咯。通过反应中间体,即2-烷基化吡咯的分离和转化,证实了级联反应途径。
Determination of the inhibitory effects of N-methylpyrrole derivatives on glutathione reductase enzyme
作者:Esma Kocaoğlu、Oktay Talaz、Hüseyin Çavdar、Murat Şentürk、Claudiu T. Supuran、Deniz Ekinci
DOI:10.1080/14756366.2018.1520228
日期:2019.1.1
Abstract Glutathionereductase (GR) is a crucial antioxidant enzyme which is responsible for the maintenance of antioxidant GSH molecule. Antimalarial effects of some chemical molecules are attributed to their inhibition of GR, thus inhibitors of this enzyme are expected to be promising candidates for the treatment of malaria. In this work, GR inhibitory properties of N-Methylpyrrole derivatives are
摘要 谷胱甘肽还原酶(GR)是一种重要的抗氧化酶,负责维持抗氧化谷胱甘肽分子。一些化学分子的抗疟作用归因于它们对 GR 的抑制,因此这种酶的抑制剂有望成为治疗疟疾的有希望的候选者。在这项工作中,报道了 N-甲基吡咯衍生物的 GR 抑制特性。结果发现,所有化合物均比GR强抑制剂N,N-双(2-氯乙基)-N-亚硝基脲具有更好的抑制活性,尤其是8m、8n和8q三个分子被确定为最强。他们之中的强者。我们的研究结果表明,这些席夫碱衍生物是强 GR 抑制剂,可用作指定新型抗疟候选药物的先导化合物。
Visible‐Light‐Induced N‐Heterocyclic Carbene‐Catalyzed Single Electron Reduction of Mono‐Fluoroarenes
An N-heterocyclic carbene (NHC)/tBuOK system was reported for the photoreduction of mono-fluoroarenes. Mechanistic studies suggest the generation of NHC radical anion as a potent reductant, and the Ar−F bond cleavage proceeds via a concerted mechanism, where single electron transfer, Ar−F bond cleavage and KF bond formation take place simultaneously.
据报道,N-杂环卡宾 (NHC)/ t BuOK 系统可用于单氟芳烃的光还原。机理研究表明,NHC 自由基阴离子的产生是一种有效的还原剂,Ar-F 键断裂通过协同机制进行,其中单电子转移、Ar-F 键断裂和 KF 键形成同时发生。