Starting from simple anilines and ester arylpropiolates, an efficient one-pot synthesis of 2-arylindole-3-carboxylate derivatives has been developed through copper-mediated sequential hydroamination and cross-dehydrogenative coupling (CDC) reaction. The initial hydroamination of anilines to ester arylpropiolates in benzene can proceed in a stereoselective manner to give ester (Z)-3-(arylamino)acrylates
Multisubstituted indoles were synthesized via a one-pot tandem copper-catalyzed Ullmann-type C–N bond formation/intramolecular cross-dehydrogenativecoupling process at 130 °C in DMSO. The methodology allows practical and modular assembly of indoles in good to excellent yields from readily available aryl iodides and enamines.
An Oxidant-Free Strategy for Indole Synthesis via Intramolecular C–C Bond Construction under Visible Light Irradiation: Cross-Coupling Hydrogen Evolution Reaction
We describe here an oxidant-free strategy to synthesize indoles, i.e., under visible-light irradiation (λ = 450 nm), catalytic amounts of an iridium(III) photosensitizer and cobaloxime catalyst transform various N-arylenamines exclusively into indoles. Our methodology affords indoles in good to excellent yields under mild reaction conditions and produces H2 as the only byproduct. Spectroscopic and
Base-promoted, CBr<sub>4</sub>-mediated tandem bromination/intramolecular Friedel–Crafts alkylation of <i>N</i>-aryl enamines: a facile access to 1<i>H</i>- and 3<i>H</i>-indoles
作者:Lan Zhao、Changfu Qiu、Lixin Zhao、Guangwei Yin、Fangyi Li、Chunhua Wang、Zheng Li
DOI:10.1039/d1ob00731a
日期:——
is a general and highly efficient method for the synthesis of 1H- and 3H-indoles. In the presence of CBr4 and a suitable base, the cyclization of N-aryl enamines proceeds with high efficiency. Unlike previous intramolecular crossdehydrogenativecoupling (CDC) of the same substrates, this process does not require the use of either a transitionmetal or a stoichiometric amount of oxidant. This method
这里描述的是一种合成 1 H - 和 3 H - 吲哚的通用且高效的方法。在CBr 4和合适的碱存在下, N-芳基烯胺的环化以高效率进行。与以前的相同底物的分子内交叉脱氢偶联 (CDC) 不同,该过程不需要使用过渡金属或化学计量的氧化剂。该方法还具有操作简单、易于扩展和良好的底物耐受性等特点。对照实验表明,反应可以在简单的一锅法中以溴化和分子内傅克烷基化的串联顺序进行。
Iodide-Ion-Catalyzed Carbon-Carbon Bond-Forming Cross-Dehydrogenative Coupling for the Synthesis of Indole Derivatives
作者:Zhenhua Jia、Takashi Nagano、Xingshu Li、Albert S. C. Chan
DOI:10.1002/ejoc.201201585
日期:2013.2
nBu4NI-catalyzed intramolecular cross-dehydrogenativecoupling (CDC) reaction has been applied to the synthesis of 1H-indole derivatives. Intramolecular oxidative coupling of N-arylenamines proceeded in the presence of a catalytic amount of nBu4NI and tert-butyl hydroperoxide (TBHP) to afford the corresponding 1H-indole derivatives in good-to-excellent yields. A preliminary study of the synthesis of 3H-indole is also