A variety of functionalities, including the whole range of halogen substituents, are tolerated in the title reaction, an intramolecular approach for the construction of a multisubstituted indole skeleton from readily available enaminones (see scheme; phen=1,10‐phenanthroline). The indole products are also prepared directly in high yield from α,β‐ynones and primary amines.
Copper-Catalyzed Cascade Cyclization Reaction of Enamines and Electron-Deficient Terminal Alkynes: Synthesis of Polysubstituted Pyrido[1,2-<i>a</i>]indoles
A novel copper-catalyzed cascade cyclization reaction between enamines and electron-deficient terminalalkynes has been developed. The reaction provides a new and efficient strategy for the construction of polysubstituted pyrido[1,2-a]indoles by the formation of two rings, three C-C bonds, and one C-N bond in a single step from readily available acyclic starting materials.
Electrochemical single-step <i>N</i>-acylation and <i>S</i>-cyclization synthesis of thiazolimide <i>via</i> radical process
作者:Yao Li、Jun Zhang、Mengyao She、Lang Liu、Zheng Yang、Ping Liu、Shengyong Zhang、Jianli Li
DOI:10.1039/d3gc00664f
日期:——
The redox reaction (RR) plays an integral role in chemical processes (such as construction of structurally diverse molecules) and is incorporated into numerous organic electrochemical devices and systems. Researchers have worked to address the specifics of RRs viaelectrochemical molecular-coupling of carboxylic acids with different molecules. This work provides a new route to catalyst-class-dependent
A novel Rh(III)-catalyzed cascade alkenyl C–H activation/[3 + 2] annulation/pinacolrearrangement reaction of enaminones with iodonium ylides has been developed. This methodology provides a new and straightforward synthetic strategy to afford highly functionalized 2-spirocyclo-pyrrol-3-ones in satisfactory yield from readily available starting materials under mild conditions. Moreover, gram-scale reactions
Copper(II)-Catalyzed Sequential C,N-Difunctionalization of 1,4-Naphthoquinone for the Synthesis of Benzo[<i>f</i>]indole-4,9-diones under Base-Free Condition
作者:Jin-Wei Sun、Xiang-Shan Wang、Yun Liu
DOI:10.1021/jo401842d
日期:2013.10.18
An efficient synthesis of benzo[f]indole-4,9-diones has been achieved by copper(II)-catalyzed naphthoquinone sequential C,N-difunctionalization reactions with beta-enaminones. New C-C and C-N bonds are easily formed in the reaction course. Copper(II) salt plays a dual role as Lewis acid and oxidative catalyst, and O-2 acts as the terminal oxidant. The advantage of this reaction is the high atom economy with broad substrate scope and excellent yields. The reaction can be scaled up to using at least grams of substrates.