Direct C–H Arylation of Heteroarenes with Copper Impregnated on Magnetite as a Reusable Catalyst: Evidence for CuO Nanoparticle Catalysis in Solution
作者:Suhelen Vásquez-Céspedes、Kathryn M. Chepiga、Nadja Möller、Andreas H. Schäfer、Frank Glorius
DOI:10.1021/acscatal.6b01288
日期:2016.9.2
operationally simple reaction conditions good yields and selectivities were obtained using diaryliodoniumsalts as coupling partners. A combination of experimental methods including kinetic studies, filtration tests, and a series of analytical tools (TXRF, ICP-MS, SEM, XPS, TEM, EFTEM) provide evidence for catalytically active soluble nanoparticles formed from an amorphous heterogeneous precursor. Mechanistic
Palladium-Catalyzed Direct Arylation of Indoles with Cyclohexanones
作者:Shanping Chen、Yunfeng Liao、Feng Zhao、Hongrui Qi、Saiwen Liu、Guo-Jun Deng
DOI:10.1021/ol500231c
日期:2014.3.21
A novel palladium catalyzed approach to 3-arylindoles was developed from indoles and cyclohexanones. Various cyclohexanones acted as aryl sources via an alkylation and dehydrogenation sequence using molecular oxygen as the hydrogen acceptor. This method showed good regioselectivity and afforded 3-arylindoles as the sole products.
3-Aryl-2-Unsubstituted Indoles through the Palladium-Catalysed Reaction of <i>o</i>-Ethynyltrifluoroacetanilide with Aryl Iodides
作者:Sandro Cacchi、Giancarlo Fabrizi、Fabio Marinelli、Leonardo Moro、Paola Pace
DOI:10.1055/s-1997-1039
日期:——
The reaction of the readily available o-ethynyltrifluoroacetanilide with aryl iodides in the presence of catalytic amounts of Pd2dba3, an excess of K2CO3, in DMSO at 40 °C affords 2-unsubstituted-3-arylindoles in good yield. Subjection of o-ethynyltrifluoroacetanilide to the same reaction conditions in the absence of aryl iodides gives rise to the formation of indole in high yield.
Direct Palladium-Catalyzed C-3 Arylation of Free (NH)-Indoles with Aryl Bromides under Ligandless Conditions
作者:Fabio Bellina、Francesca Benelli、Renzo Rossi
DOI:10.1021/jo8007572
日期:2008.7.1
practical, and highly regioselective directpalladium-catalyzed C-3 arylation of free (NH)-indole and its electron-rich 1-unsubstituted derivatives under ligandless conditions is described. The reactions, which are run outside a glovebox without purification of solvent and reagents, involve treatment of free (NH)-indoles with activated, unactivated, and deactivated arylbromides in refluxing toluene in the
描述了一种在无配体条件下有效,实用和高度区域选择性的直接钯催化的游离(NH)-吲哚及其富电子的1-未取代衍生物的C-3芳基化的新方法。该反应在手套箱外部进行,无需纯化溶剂和试剂,涉及在K 2 CO 3作为碱和甲苯的存在下,在回流的甲苯中用活化的,未活化的和失活的芳基溴化物处理游离的(NH)-吲哚。催化剂体系,由Pd(OAc)2和苄基(三丁基)氯化铵组成。实验结果与基于在1-吲哚基钾盐的3-位上的亲电性lad回路径的催化循环一致。
Immobilized Indolylboron as a Key Intermediate for Solid-Phase Synthesis of Bisindole Alkaloid Analogs