Photoelectrochemical cross-dehydrogenative coupling of benzothiazoles with strong aliphatic C–H bonds
作者:Luca Capaldo、Lorenzo L. Quadri、Daniele Merli、Davide Ravelli
DOI:10.1039/d1cc01012c
日期:——
cross-dehydrogenative coupling of unactivated aliphatic hydrogen donors (e.g. alkanes) with benzothiazoles is reported. We used tetrabutylammonium decatungstate as the photocatalyst to activate strong C(sp3)–H bonds in the chosen substrates, while electrochemistry scavenged the extra electrons.
Long‐ing alkyl chain: The catalytic direct CH alkylation of azoles with unactivatedalkyl bromides and chlorides is described. A palladium catalyst enables the alkylation of oxazoles, whereas a nickel one shows unique activity for thiazole. The catalyses allow a straightforward access to azole motifs bearing long, functional alkyl side chains.
Ni-Catalyzed Reductive Liebeskind–Srogl Alkylation of Heterocycles
作者:Yuanhong Ma、Jose Cammarata、Josep Cornella
DOI:10.1021/jacs.8b13534
日期:2019.2.6
Herein we present a Ni-catalyzed alkylation of C–SMe with alkyl bromides for the decoration of heterocyclic frameworks. The protocol, reminiscent to the Liebeskind–Srogl coupling, makes use of simple C(sp2)–SMe to be engaged in a reductive coupling. The reaction is suitable for a preponderance of highly valuable heterocyclic motifs. In addition to cyclic bromides, noncyclic alkyl bromides are well
在此,我们提出了用烷基溴对 C-SMe 进行 Ni 催化烷基化,用于装饰杂环骨架。该协议让人想起 Liebeskind-Srogl 耦合,利用简单的 C(sp2)-SMe 进行还原耦合。该反应适用于占优势的高价值杂环基序。除了环溴化物外,非环烷基溴化物也能很好地适应异构化的保留水平。该协议是可扩展的,并允许在存在其他功能化句柄的情况下进行正交耦合。
Unexpected Ring Opening During the Imination of Camphor‐Type Bicyclic Ketones
作者:Vladimir V. Chernyshov、Olga I. Yarovaya、Sergey Z. Vatsadze、Sophia S. Borisevich、Sergey N. Trukhan、Yuri V. Gatilov、Roman Yu. Peshkov、Ilia V. Eltsov、Oleg N. Martyanov、Nariman F. Salakhutdinov
DOI:10.1002/ejoc.202001397
日期:2021.1.22
New condensation reaction of camphor‐like ketones with o‐substituted anilines leading to formation of 2‐substituted benzoazoles is reported. A new reaction proceeds via ring opening of the bicyclic core. Quantum chemical calculations and EPR spectroscopy study suggest that imine radicals are key‐intermediates responsible for this unusual process.
Nucleophilic character of the alkyl radicals. 16. Absolute rate constants and the reactivity-selectivity relationship in the homolytic aromatic alkylation