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-C-H Functionalization of Aniline Derivatives via In situ Generated Bulky Hypervalent Iodinium Reagents
作者:Chao Tian、Xu Yao、Weizhe Ji、Qian Wang、Guanghui An、Guangming Li
DOI:10.1002/ejoc.201801058
日期:2018.11.25
A general para‐selective C‐H functionalization was achieved via a stericcontrol strategy. Para‐iodo, bromo, chloro, nitro, and trifluormethyl aniline derivatives were prepared via in situ generated, bulky hypervalent iodinium reagents in as little as 10 min. Products can be purified without column chromatography or recrystallization, which significantly reduces the waste and simplifies the work‐up
Electrophilic halogenation is used to produce a wide variety of halogenated compounds. Previously reported methods have been developed mainly using a reagent‐based approach. Unfortunately, a suitable “catalytic” process for halogen transfer reactions has yet to be achieved. In this study, arylamines have been found to generate an N‐halo arylamine intermediate, which acts as a highly reactive but selective catalytic
functionalization of arenes that is complementary to classical aromatic substitution reactions remains a long‐standing quest in organic synthesis. Exploiting the generation of halenium ion through oxidative process and the protonation of the nitrogen containing function in HF/SbF5, the chlorination and iodination of classically inert Csp2−H bonds of aromatic amines occurs. Furthermore, the superacid‐promoted (poly)protonation
Oxidative Iodination of Aromatic Amides Using Sodium Perborate or Hydrogen Peroxide with Sodium Tungstate†
作者:Philipp Beinker、James R. Hanson、Nadja Meindl、Inmaculada C. Rodriguez Medina
DOI:10.1039/a707933h
日期:——
Hydrogen peroxide or sodiumperborate in the presence of a sodium tungstate catalyst are shown to be cheap oxidants for the iodination of aromatic amides using potassium iodide as the source of the iodine.
Pd-Catalyzedortho-Selective Oxidative Coupling of Halogenated Acetanilides with Acrylates
作者:George T. Lee、Xinglong Jiang、Kapa Prasad、Oljan Repič、Thomas J. Blacklock
DOI:10.1002/adsc.200505202
日期:2005.12
Coupling of different halogenatedacetanilides with acrylates using Pd-catalyzed ortho-selective CH bond activation is reported. The yields of coupled products are low to high depending on the substrate. In general, arenes with electron-rich substituents like methoxy and methyl groups gave higher yields of the coupled products. The presence of the halogen substituent did not interfere with the activation