Transition-Metal-Free Method for the Synthesis of Benzo[b]thiophenes from o-Halovinylbenzenes and K2S via Direct SNAr-Type Reaction, Cyclization, and Dehydrogenation Process
摘要:
A new, highly efficient procedure for the synthesis of benzothiophenes from easily available o-halovinylbenzenes and potassium sulfide has been developed. The reaction tolerated a wide range of functionalities, and various 2-substituted benzo[b]thiophenes are provided in the high yields in the absence of a transition-metal catalyst.
Palladium-Catalyzed Solid-State Polyfluoroarylation of Aryl Halides Using Mechanochemistry
作者:Rikuro Takahashi、Tamae Seo、Koji Kubota、Hajime Ito
DOI:10.1021/acscatal.1c03731
日期:2021.12.17
products. Here, we show that solid-state high-temperature ball-milling conditions facilitate a palladium-catalyzed cross-coupling with polyfluorinated arylboronic acids and pinacol esters employing a simple catalytic system in the absence of any stoichiometric additives. This reaction exhibits a broad substrate scope and can be carried out in air, and the use of large amounts of dry and degassed organic solvents
Palladacycles derived from arylphosphinamides for mild Suzuki–Miyaura cross-couplings
作者:Guo-Jie Wu、Fu-She Han、Yu-Long Zhao
DOI:10.1039/c5ra12742d
日期:——
of palladacycles, a wide variety of aryl bromides and boronicacids could be coupled very efficiently at ambient temperature and under air atmosphere without the need of external supporting ligands. Moreover, the mild conditions also allow for smooth coupling of electron-deficient, i.e., the less stable aryl triflates. In addition to the highly catalytic activity, the palladacyclic complexes can be
Conditions for the palladium-catalyzed directarylation of a wide range of heterocycles with aryl bromides are reported. Those conditions employ a stoichiometric ratio of both coupling partners, as well as a substoichiometric quantity of pivalicacid, which results in significantly faster reactions. An evaluation of the influence of the nature of the aryl halide has also been carried out.
Three-component 2-aryl substituted benzothiophene formation under transition-metal free conditions
作者:Pengcheng Jiang、Xingzong Che、Yunfeng Liao、Huawen Huang、Guo-Jun Deng
DOI:10.1039/c6ra07730g
日期:——
A base-mediated 2-aryl substituted benzothiopheneformation from 2-bromobenzene aldehydes, benzylic esters and elemental sulfur under transition-metal-free conditions is described. Various 2-aryl substituted benzothiophene were efficiently obtained under mild conditions.
Phosphine-free palladium-catalysed direct C2-arylation of benzothiophenes with aryl bromides
作者:Liqin Zhao、Christian Bruneau、Henri Doucet
DOI:10.1016/j.tet.2013.06.037
日期:2013.8
some electron-rich aryl bromides. The presence of a methyl or a formyl substituent at C3 of benzothiophene has a minor influence on the reactivity, and even a bromo substituents at C3 is tolerated. A wide variety of functional groups on the aryl bromide, such as nitrile, nitro, acetyl, formyl, ester, chloro, fluoro or trifluoromethyl has been employed.