A Direct Access to 7-Aminoindoles via Iridium-Catalyzed Mild C–H Amidation of <i>N</i>-Pivaloylindoles with Organic Azides
作者:Youyoung Kim、Juhyeon Park、Sukbok Chang
DOI:10.1021/acs.orglett.6b00662
日期:2016.4.15
Ir(III)-catalyzed regioselective directC-7amidation of indoles in reaction with organic azides has been developed. While its efficiency was varied by the choice of N-directing groups, N-pivaloylindoles were most effective in undergoing the desired amidation at roomtemperature over a broad range of substrates. The reaction was scalable, and deprotection of the chelation group was also facile.
Iridium(<scp>iii</scp>)-catalyzed regioselective C7-sulfonamidation of indoles
作者:Zengqiang Song、Andrey P. Antonchick
DOI:10.1039/c6ob00926c
日期:——
C7-sulfonamidation of indoles with sulfonyl azides is described. The developed method has good compatibility with diverse functional groups, providing various 7-amino-substituted indoles with good to excellent yields in a short time under mild reaction conditions. The key feature of the developed method is the regioselective functionalization at the C7-position of 2,3-unsubstituted indoles. Biologically active
Cu-Catalyzed Oxidative 3-Amination of Indoles via Formation of Indolyl(aryl)iodonium Imides Using o-Substituted (Diacetoxyiodo)arene as a High-Performance Hypervalent Iodine Compound
作者:Kazuhiro Watanabe、Katsuhiko Moriyama
DOI:10.3390/molecules24061147
日期:——
An oxidative 3-amination of indole derivatives using hypervalent iodine(III) and bissulfonimides, which proceeds via the formation of indolyl(aryl)iodonium imides, was developed. This reaction was followed by an indole-selective copper-catalyzed oxidativeC–Ncoupling reaction to obtain 3-amino indole derivatives as single regioisomers. o-Alkoxy(diacetoxyiodo)arenes showed higher reactivity in the
Ruthenium(II)-Catalyzed Direct C7-Selective Amidation of Indoles with Dioxazolones at Room Temperature
作者:Yaoguang Sheng、Jianmin Zhou、Yi Gao、Bingbing Duan、Yi Wang、Aleksandr Samorodov、Guang Liang、Qiuhua Zhao、Zengqiang Song
DOI:10.1021/acs.joc.0c02779
日期:2021.2.5
A protocol for the preparation of 7-amido indoles via regioselective C–H bond functionalization has been first accomplished under Ru(II) catalysis. Indole derivatives and 4-aryl/heteroaryl/benzyl/alkyl dioxzaolines containing various substituents were applicable for this transformation, readily providing the amidated indoles in moderate to good yields. This novel process has many advantages, including
Ruthenium‐Catalyzed Vinylene Carbonate Annulation by C−H/N−H Functionalizations: Step‐Economical Access to Indoles
作者:Yao Yu、Yang Wang、Bo Li、Yuqiang Tan、Huan Zhao、Zheyu Li、Chunran Zhang、Wenbo Ma
DOI:10.1002/adsc.202101466
日期:2022.2.15
A convenient and effective method of ruthenium-catalyzed C−H/N−H annulations using vinylene carbonate as oxidizing acetylene surrogate has been disclosed. This method is scalable and compatible with a wide range of functional groups, providing a step-economical access to indolesynthesis Preliminary mechanistic studies provided support for a reversible, acetate-assisted C−H ruthenation, along with