Transition-Metal-Free C3 Arylation of Indoles with Aryl Halides
作者:Ji Chen、Jimmy Wu
DOI:10.1002/anie.201612311
日期:2017.3.27
We report an unprecedented transitionmetal‐free coupling of indoles with aryl halides. The reaction is promoted by KOtBu and is regioselective for C3 over N. The use of degassed solvents devoid of oxygen is necessary for the success of the transformation. Preliminary studies implicate a hybrid mechanism that involves both aryne intermediates and non‐propagative radical processes. Electron transfer
A general synthetic route to indolesfrom readily available anilines and epoxides by using ruthenium catalysis is described. This straightforward transformation allows a variety of indoles to be obtained in good yields by using [Ru3(CO)12]/1,1′‐bis(diphenylphosphino)ferrocene as the catalytic system. Water and hydrogen are formed as the only stoichiometric by‐products, making this process highly atom
The regioselective Larock indole synthesis catalyzed by NHC–palladium complexes
作者:Pan He、Yufeng Du、Gang Liu、Changsheng Cao、Yanhui Shi、Juan Zhang、Guangsheng Pang
DOI:10.1039/c3ra42788a
日期:——
The first practical and regioselective process for the synthesis of 2,3-disubstituted indoles from the reaction of o-iodoanilines or o-bromoanilines and their derivatives with symmetrical and unsymmetrical internal alkynes catalyzed by a ferrocene-functionalized N-heterocyclic carbene (NHC)âpalladium complex has been developed, and the indoles were isolated in good yields with high regioselectivity.
Regioselective Pd-catalyzed indolization of 2-bromoanilines with internal alkynes using phosphine-free ligands
作者:Xin Cui、Juan Li、Yao Fu、Lei Liu、Qing-Xiang Guo
DOI:10.1016/j.tetlet.2008.03.112
日期:2008.5
The possibility of using phosphine-free ligands to promote Pd-catalyzed indolization of 2-bromoanilines with internal alkynes was examined for the first time. Phenylurea was found to be the optimal ligand, which could mediate the synthesis of 2,3 -disubstituted indoles in good yields (ca. 60-85%) with high regioselectivity. (C) 2008 Elsevier Ltd. All rights reserved.