Additive-Free Copper(I)-Mediated Synthesis of 5- or 6-Brominated 2-Aryl-1<i>H</i>-Indole-3-Carboxylates from α,α-Dibromo β-Iminoesters
作者:Zhenfa Li、Lan Zhao、Liuyi Liang、Lixin Zhao、Fangyi Li、Chunhua Wang、Zheng Li
DOI:10.1021/acs.joc.0c02497
日期:2021.1.15
Additive-free copper(I)-bromide-mediated radical cyclization reactions of α,α-dibromo β-iminoesters were investigated, enabling the synthesis of a series of 5- or 6-brominated 2-aryl-1H-indole-3-carboxylates in moderate to good yields. The mechanistic study showed that (i) the bromine atom originated from the substrates and (ii) the bromination might be related to a 3-bromo-3H indole intermediate via
Iodine-Mediated Synthesis of 3<i>H</i>-Indoles via Intramolecular Cyclization of Enamines
作者:Zhiheng He、Huanrong Li、Zhiping Li
DOI:10.1021/jo100796s
日期:2010.7.2
The synthesis of 3H-indoles was achieved via the iodine-mediated intramolecular cyclization of enamines. A wide variety of 3H-indole derivatives bearing multifunctional groups were obtained in good to high yields under transition metal-free reaction conditions.
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。