oxidative olefination of indole at C‐2, C‐3, C‐4 and C‐7 positions was well addressed. We report here a rhodium‐catalyzed NH‐indole‐directed ortho C−H bond olefination of 2‐arylindoles. This cross‐dehydrogenative‐coupling proved to be broad in substrate scope, tolerating a variety of functional groups. The synthesis of 6H‐isoindolo[2,1‐α]indoles via rhodium‐catalyzed ortho C−H olefination and subsequent
Synthesis of Indoles by Reductive Cyclization of Nitro Compounds Using Formate Esters as CO Surrogates
作者:Manar Ahmed Fouad、Francesco Ferretti、Dario Formenti、Fabio Milani、Fabio Ragaini
DOI:10.1002/ejoc.202100789
日期:2021.9.14
A very efficient, general and scalable protocol for the preparation of indoles and other N-heterocycles from suitably substituted nitroarenes using alkyl and phenyl formates as CO surrogates was described. Using phenyl formate, the products were isolated in yields often higher than those previously achieved by using gaseous CO. The mechanism of both the decarbonylation reaction of phenyl formate and
描述了使用烷基和苯基甲酸酯作为 CO 替代物从适当取代的硝基芳烃制备吲哚和其他N-杂环的非常有效、通用和可扩展的方案。使用甲酸苯酯,产物的分离产率通常高于以前使用气态 CO 实现的产率。通过动力学和机理研究阐明了甲酸苯酯的脱羰反应和环化反应的机理。
A Three-Component Strategy for Benzoselenophene Synthesis under Metal-Free Conditions Using Selenium Powder
作者:Penghui Ni、Jing Tan、Wenqi Zhao、Huawen Huang、Fuhong Xiao、Guo-Jun Deng
DOI:10.1021/acs.orglett.9b00739
日期:2019.5.17
An efficient three-component benzoselenophenes formation has been developed from substituted indoles, acetophenones, and selenium powder under metal-free conditions. 2-Aryl indoles played an important role to promote benzoselenophene formation from acetophenone derivatives and selenium powder. One C–C and two C–Se bonds were selectively formed to provide 40 new benzoselenophenes in good yields.
Internal Oxidant-Triggered Aerobic Oxygenation and Cyclization of Indoles under Copper Catalysis
作者:Huawen Huang、Jinhui Cai、Xiaochen Ji、Fuhong Xiao、Ya Chen、Guo-Jun Deng
DOI:10.1002/anie.201508076
日期:2016.1.4
A concise synthesis of pyrazolo[1,5‐a]indole derivatives by copper‐catalyzed aerobic oxygenation and cyclization of indoles with oxime acetates is described. This protocol represents an elegant example of N‐1, C‐2, and C‐3 tri‐functionalization of indoles in one‐pot. Mechanistic studies indicate the reaction proceeds through a radical procedure. Oximes as an internal oxidant have been demonstrated
Microwave-Accelerated Pd-Catalyzed Desulfitative Direct C2-Arylation of Free (NH)-Indoles with Arylsulfinic Acids
作者:Tao Miao、Pinhua Li、Guan-Wu Wang、Lei Wang
DOI:10.1002/asia.201300913
日期:2013.12
and efficientdirectC2‐arylation of free (NH)‐indoles with arylsulfinic acids proceeded through a microwave‐accelerated palladium‐catalyzed desulfitation reaction. By using PdCl2 as a catalyst, silver acetate as an oxidant, and H2SO4 as an additive, arylsulfinic acids with both electron‐donating and electron‐withdrawing groups underwent desulfitative coupling with an array of free (NH)‐indoles, thereby
游离(NH)吲哚与芳基亚磺酸的快速有效的直接C2-芳基化反应是通过微波促进的钯催化的脱硫反应进行的。通过使用PdCl 2作为催化剂,乙酸银作为氧化剂,H 2 SO 4作为添加剂,具有给电子基团和吸电子基团的芳基亚磺酸与一系列游离的(NH)吲哚进行脱硫偶联,从而有选择地提供高收率的C2-芳基吲哚。