Metal-Free <i>ortho</i>-Selective C–H Borylation of 2-Phenylthiopyridines Using BBr<sub>3</sub>
作者:Gaorong Wu、Binghan Pang、Yangyang Wang、Li Yan、Lu Chen、Tao Ma、Yafei Ji
DOI:10.1021/acs.joc.1c00520
日期:2021.4.16
2-phenylthiopyridines using BBr3 as the boron source under metal-free conditions has been reported. The reaction exhibited site exclusivity, and the synthesized aryl boronates were freely converted to various useful intermediates. Thus, this facile method would be beneficial to synthesize structurally diversified phenylthioethers derivatives and other materials containing boron-nitrogen coordination.
Sulfur–silicon bond activation catalysed by Cl/Br ions: waste-free synthesis of unsymmetrical thioethers by replacing fluoride catalysis and fluorinated substrates in SNAr reactions
In contrast to conventional activation of NuâSiR3 reagents by F ion attributed to the strong affinity of Si to F, SâSi activation can now be achieved using Cl/Br ions of TBAX as catalysts via formation of weaker XâSi bonds and Me3SiâX. This led to a waste-free synthesis of unsymmetrical thioethers via F-free SNAr reactions of activated (hetero)aryl halides and RSâSiMe3, with recovery of the useful Me3SiâX reagent in high yields.
Intramolecular C−H Activation as an Easy Toolbox to Synthesize Pyridine‐Fused Bipolar Hosts for Blue Organic Light‐Emitting Diodes
作者:Fei Wang、Luoqiang Zhang、Weiguo Han、Zhengyang Bin、Jingsong You
DOI:10.1002/anie.202205380
日期:2022.8.8
Iridium-catalyzed intramolecular oxidative C−H/C−H coupling reactions have been developed to rapidly build a library of structurally and functionallydiverse benzoheteroaromatic-fused pyridine skeletons. This new synthetic strategy allowed to explore and highlight the high performance of bipolar host materials for blue OLEDs.
nickel-catalytic conversion of in situ-generated redox-active sulfinyl sulfones for reductive coupling with a wide variety of organic halides by the dual-role nickel catalyst and dual-role reductant Zn. Mechanistic studies disclose that the key design of such a reaction is the employment of redox-active sulfinyl sulfones, enabling the in situ generation of electrophilic sulfur reagents through zinc-induced