A Copper-Mediated Oxidative Coupling Route to 3<i>H</i>- and 1<i>H</i>-Indoles from<i>N</i>-Aryl-enamines
作者:Pauline Drouhin、Richard J. K. Taylor
DOI:10.1002/ejoc.201500112
日期:2015.4
copper(II)-mediated C–H bond oxidation and C–C bond formation procedure has been applied to the synthesis of indole derivatives. Intramolecular oxidativecoupling of 3,3-disubstituted enamines proceeded using a non-expensive and air-stable copper salt, Cu(2-ethylhexanoate)2, to afford the corresponding C-3 quaternary indolenine products in good to excellent yields. 1H-Indoles can be prepared in a similar
Brønsted Base-Catalyzed Reductive Cyclization of Alkynyl α-Iminoesters through Auto-Tandem Catalysis
作者:Azusa Kondoh、Masahiro Terada
DOI:10.1021/acs.orglett.8b02236
日期:2018.9.7
auto-tandem catalysis with a Brønsted base as the catalyst. The reaction system involves two mechanistically different elementary processes, both of which are efficiently catalyzed by an organosuperbase P2-tBu: the unprecedented reduction of α-iminoesters with 1-dodecanethiol as the reductant to provide α-aminoesters and the following intramolecular addition of ester enolates to an alkyne. The operationally
通过以布朗斯台德碱为催化剂的自动串联催化,开发了炔基α-亚氨基酸酯的新型还原环化反应。反应系统涉及两个机理上不同的基本过程,有机超碱P2- t Bu有效地催化了这两个过程:以1-十二烷硫醇为还原剂的α-亚氨基酯的空前还原以提供α-氨基酯,以及随后在分子内添加酯烯醇成炔。在温和条件下操作简单的反应为N -H二氢吲哚衍生物提供了新的有效途径,证明了使用Brønsted碱作为有机合成方法的自动串联催化的巨大潜力。
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