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。
Multibond Forming Tandem Reactions of Anilines via Stable Aryl Diazonium Salts: One-Pot Synthesis of 3,4-Dihydroquinolin-2-ones
作者:Réka J. Faggyas、Megan Grace、Lewis Williams、Andrew Sutherland
DOI:10.1021/acs.joc.8b01910
日期:2018.10.19
A fast and effective one-pot tandem process that generates Heck coupled products from readily available anilines via stable aryl diazonium tosylate salts was developed. The mild and simple procedure involves rapid formation of aryl diazonium salts using a polymer-supported nitrite reagent and p-tosic acid, followed by a base-free Heck–Matsuda coupling with acrylates and styrenes. Using 2-nitroanilines
Unprecedented Substoichiometric Use of Hazardous Aryl Diazonium Salts in the Heck-Matsuda Reaction via a Double Catalytic Cycle
作者:François Le Callonnec、Eric Fouquet、François-Xavier Felpin
DOI:10.1021/ol200752x
日期:2011.5.20
The first Heck-Matsudareaction using a catalyticamount of diazoniumsalts has been discovered. The reaction proceeds through an unprecedented double catalytic cycle in which the electrophile is in situ generated through the reaction advancement. This concept features mild and safe conditions as hazardous aryl diazoniumsalts are not isolated anymore. Importantly, this sustainable procedure generates
Palladium Nanoparticles Supported on Sulfonic Acid Functionalized Silica as Trifunctional Heterogeneous Catalysts for Heck and Suzuki Reactions
作者:Nicolas Oger、Erwan Le Grognec、François-Xavier Felpin
DOI:10.1002/cctc.201500179
日期:2015.7.13
successfully achieved by using trifunctional heterogeneous catalysts bearing Brønsted acid and metal active sites. The trifunctional materials were prepared by adsorption of palladium nanoparticles, generated by reduction of a solution of Pd(OAc)2 onto a commercially available sulfonic acid functionalized silica. These new trifunctional catalysts act as a 1) proton donor for the diazotization step, 2) counterion
Heck-Matsuda Arylation of Olefins Through a Bicatalytic Approach: Improved Procedures and Rationalization
作者:Nicolas Oger、François Le Callonnec、Denis Jacquemin、Eric Fouquet、Erwan Le Grognec、François-Xavier Felpin
DOI:10.1002/adsc.201301144
日期:2014.3.24
The scope of the palladium‐catalyzed Heck–Matsudareaction, proceeding through the catalytic activation of anilines into the corresponding diazoniumsalts, has been considerably extended and is now working with deactivated electrophiles. Two different procedures, using catalyticamounts of both palladium and acid, have been optimized allowing the concept of bicatalysis to cover the complete electronic