作者:Mahesh Puthanveedu、Vladislav Khamraev、Lukas Brieger、Carsten Strohmann、Andrey P. Antonchick
DOI:10.1002/chem.202100960
日期:2021.5.26
A transition-metal-free direct electrolytic C−H amination involving an electrochemically generated nitrenium ion intermediate has been developed. The electrosynthesis takes place in the absence of any organoiodine catalysts and is enabled by an in situ generated electrolyte. A novel, efficient intramolecular and intermolecular C−H amination has been demonstrated using a simple reaction setup.
Organocatalytic, Oxidative, Intramolecular CH Bond Amination and Metal-free Cross-Amination of Unactivated Arenes at Ambient Temperature
作者:Andrey P. Antonchick、Rajarshi Samanta、Katharina Kulikov、Jonas Lategahn
DOI:10.1002/anie.201102984
日期:2011.9.5
atom‐economical and environmentally friendly organocatalytic method for intramolecular CH amination, the CN bond forms at ambient temperature by abstraction of two atoms of hydrogen; only acetic acid and water are formed as by‐products. The method has also been extended to the unprecedented metal‐free cross‐amination of nonactivated arenes.
Intramolecular Oxidative C−N Bond Formation for the Synthesis of Carbazoles: Comparison of Reactivity between the Copper-Catalyzed and Metal-Free Conditions
作者:Seung Hwan Cho、Jungho Yoon、Sukbok Chang
DOI:10.1021/ja111652v
日期:2011.4.20
New synthetic procedures for intramolecular oxidative C-N bondformation have been developed for the preparation of carbazoles starting from N-substituted amidobiphenyls under either Cu-catalyzed or metal-freeconditions using hypervalent iodine(III) as an oxidant. Whereas iodobenzene diacetate or bis(trifluoroacetoxy)iodobenzene alone undergoes the reaction to provide carbazole products in moderate
已经开发了用于分子内氧化 CN 键形成的新合成程序,用于在 Cu 催化或无金属条件下使用高价碘 (III) 作为氧化剂从 N 取代的酰氨基联苯制备咔唑。虽然二乙酸碘苯或双(三氟乙酰氧基)碘苯单独进行反应以提供中低收率的咔唑产物,但三氟甲磺酸铜(II)和碘(III)物质的组合使用显着提高了反应效率,提供了更多样化的范围产品良率高。在包括动力学曲线、同位素效应和自由基抑制实验在内的机理研究的基础上,铜物种被提议用于催化激活高价碘 (III) 氧化剂。
Transition-metal-free and organic solvent-free conversion of <i>N</i>-substituted 2-aminobiaryls into corresponding carbazoles <i>via</i> intramolecular oxidative radical cyclization induced by peroxodisulfate
作者:Palani Natarajan、Priya Priya、Deachen Chuskit
DOI:10.1039/c7gc03130k
日期:——
benign approach for the synthesis of N-substituted carbazoles from analogous 2-aminobiaryls using peroxodisulfate in water is reported. The reactions proceeded through an intramolecular oxidative radical cyclization of N-substituted 2-aminobiaryls with in situ reoxidation of the resulting radical species. When compared to known methods for the synthesis of N-substituted carbazoles from 2-amidobiaryls, this
Pd(<scp>ii</scp>) pincer type complex catalyzed tandem C–H and N–H activation of acetanilide in aqueous media: a concise access to functionalized carbazoles in a single step
One-pot, tandem C-H and N-H activation of acetanilides with aryl boronic acids to realize functionalized carbazoles were conveniently performed under aerobic conditions using a novel NNO pincer type Pd(II)complex [Pd(L)Cl]...