Ultrasound-assisted synthesis of Z and E stilbenes by Suzuki cross-coupling reactions of organotellurides with potassium organotrifluoroborate salts
作者:Rodrigo Cella、Hélio A. Stefani
DOI:10.1016/j.tet.2006.03.090
日期:2006.6
Palladium (0)-catalyzed cross-coupling reactions between potassium aryl- and vinyltrifluoroborate salts and aryl- and vinylic tellurides proceeds readily to afford the desired stilbenes in good to excellent yields. Stilbenes containing a variety of functional groups can be prepared.
Suzuki−Miyaura Cross-Coupling Reactions of Aryl Tellurides with Potassium Aryltrifluoroborate Salts
作者:Rodrigo Cella、Rodrigo L. O. R. Cunha、Ana E. S. Reis、Daniel C. Pimenta、Clécio F. Klitzke、Hélio A. Stefani
DOI:10.1021/jo052061r
日期:2006.1.1
Palladium(O)-catalyzed cross-coupling between potassium aryltrifluoroborate salts and aryl tellurides proceeds readily to afford the desired biaryls in good to excellent yield. The reaction seems to be unaffected by the presence of electron-withdrawing or electron-donating substituents in both the potassium aryltrifluoroborate salts and aryl tellurides partners. Biaryls containing a variety of functional groups can be prepared. A chemoselectivity study was also carried out using aryl tellurides bearing halogen atoms in the same compound. In addition, this new version of the Suzuki-Miyaura cross-coupling reaction was monitored by electrospray ionization mass spectrometry where some reaction intermediates were detected and analyzed.
Synthesis of benzophenones from geminal biaryl ethenes using m-chloroperbenzoic acid
作者:Fateh V. Singh、Humberto M.S. Milagre、Marcos N. Eberlin、Helio A. Stefani
DOI:10.1016/j.tetlet.2009.02.164
日期:2009.5
The oxidation of geminal biaryl ethenes 3 and 1,3-enynes 5 using m-chloroperbenzoic acid in dichloromethane at room temperature presents a catalyst-free approach for the synthesis of functionalized benzophenones 4 and ynones 6, respectively. (C) 2009 Elsevier Ltd. All rights reserved.
An alternative approach for the synthesis of aryl–alkyl tellurides: reaction of aryl iodides with metal alkyltellurolates promoted by CuI
作者:Márcio S. Silva、João V. Comasseto
DOI:10.1016/j.tet.2011.09.014
日期:2011.11
Aryliodides react with metal organotellurolates in tetrahydrofuran/dimethylformamide in the presence of CuI (5 mol %) or CuI (5 mol %) and 1,10-phenanthroline (10 mol %) to afford the corresponding aryl–alkyl tellurides in good yields.
Ultrasound-Assisted Synthesis
of Symmetrical Biaryls by Palladium-Catalyzed Homocoupling
of Aryl <i>n</i>-Butyl Tellurides
作者:Hélio Stefani、Fateh Singh
DOI:10.1055/s-0028-1087244
日期:——
An ultrasound-assisted synthesis of symmetricalbiaryls withelectron-withdrawing or -donating substituents is described andillustrated by palladium-catalyzed homocouplingreaction of aryltellurides. This procedure offers easy access to biaryls in short reactiontime, and the products are achieved in good to excellent yields.