Electrochemical Dearomative 2,3-Difunctionalization of Indoles
作者:Ju Wu、Yingchao Dou、Régis Guillot、Cyrille Kouklovsky、Guillaume Vincent
DOI:10.1021/jacs.8b13371
日期:2019.2.20
oxidative dearomatization of indoles leading to 2,3-dialkoxy or 2,3-diazido indolines under undivided conditions at a constant current. This operationally simple electro-oxidative procedure avoids the use of an external oxidant and displays excellent functional group compatibility. The formation of the two C-O or C-N bonds is believed to arise from the oxidation of the indoles into radical cation intermediates
我们报告了使用电化学对吲哚进行直接氧化脱芳构化,在恒定电流下在未分开的条件下产生 2,3-二烷氧基或 2,3-二叠氮二氢吲哚。这种操作简单的电氧化程序避免了使用外部氧化剂并显示出优异的官能团兼容性。两个 CO 或 CN 键的形成被认为是由吲哚氧化成自由基阳离子中间体引起的。
Triflic Acid as an Efficient Brønsted Acid Promoter for the Umpolung of N-Ac Indoles in Hydroarylation Reactions
作者:Raj Kumar Nandi、Alejandro Perez-Luna、Didier Gori、Rodolphe Beaud、Régis Guillot、Cyrille Kouklovsky、Vincent Gandon、Guillaume Vincent
DOI:10.1002/adsc.201701074
日期:2018.1.4
We report that triflicacid, a strong Brønsted acid, is a very powerful alternative to FeCl3 to mediate the hydroarylation of N−Ac indoles, which delivers regioselectively 3‐arylindolines, 3,3‐spiroindolines or 2‐arylindolines. Mechanistic explorations point towards the existence of a highly electrophilic intermediate by simultaneous activation of the acetyl and of the C2=C3 bond by protons.
Direct Oxidative Coupling of<i>N</i>-Acetyl Indoles and Phenols for the Synthesis of Benzofuroindolines Related to Phalarine
作者:Terry Tomakinian、Régis Guillot、Cyrille Kouklovsky、Guillaume Vincent
DOI:10.1002/anie.201404055
日期:2014.10.27
by the biogenetic synthesis of benzofuroindoline‐containing natural products, we designed an oxidative coupling between phenol and N‐acetyl indoles. This straightforward and direct radical process, mediated by 2,3‐dichloro‐5,6‐dicyano‐1,4‐benzoquinone and FeCl3 allowed the regioselective synthesis of benzofuro[3,2‐b]indolines, whose structure is found in the natural product phalarine.
Molybdenum-Catalyzed α-Hydrostannations of Propargylamines as the Key Step in the Synthesis of N-Heterocycles
作者:Hechun Lin、Uli Kazmaier
DOI:10.1002/ejoc.200801157
日期:2009.3
The Mo-catalyzed hydrostannation of propargylic amines and amides gave rise to functionalized vinylstannanes in good yield. The α-stannylated products were formed preferentially, which are interesting synthetic building blocks. If halogenated aromatic amines were subjected to this protocol, the products obtained could be converted into indole and isoquinoline derivatives through intramolecular Stille
Copper-Catalyzed Intermolecular Cross-dehydrogenative C–N Coupling at Room Temperature via Remote Activating Group Enabled Radical Relay Strategy
作者:Xiaoqi Jia、Xiangmin Tian、Dailin Zhuang、Zhenyang Wan、Jiahao Gu、Ziyuan Li
DOI:10.1021/acs.orglett.3c00267
日期:2023.3.31
Employing N-fluorobenzenesulfonimide (NFSI) as a nitrogen-centered radical (NCR) precursor, an intermolecular C(sp2)–N coupling on heteroarenes or substituted benzenes with remote activated aniline derivatives via copper catalyzed N–N radical relay strategy at roomtemperature is developed. Good to excellent yields are acquired, and no ligand or additive is required. Reaction scope investigation and