Synthesis of Functionalized 2-Arylthiophenes with Triarylbismuths as Atom-Efficient Multicoupling Organometallic Nucleophiles under Palladium Catalysis
作者:Maddali Rao、Debasis Banerjee、Ritesh Dhanorkar
DOI:10.1055/s-0030-1260554
日期:2011.6
Atom-efficient cross-coupling reactions of functionalized 2-bromo- and 2-iodothiophenes have been demonstrated using triarylbismuths as atom-efficientmulticoupling organometallic nucleophiles under palladium-catalyzed conditions. These couplings with various functionalized triarylbismuths proceeded smoothly to afford the corresponding functionalized 2-arylthiophenes in high yields.
A simple, mild and green approach has been developed for the synthesis of asymmetrical heterobiaryls under the irradiation of visible light without any oxidants and promoting reagents through using Pd/CeO2 nanocomposite photocatalyst. This method can tolerate considerable functional groups such as electron donating groups and electron-withdrawing groups through C-C cross-coupling. Moreover, we obtain the products with moderate yields in an efficient way. Finally, a plausible mechanism is proposed. (C) 2018 Chinese Chemical Society and Institute of Materia Medica, Chinese Academy of Medical Sciences. Published by Elsevier B.V. All rights reserved.
Rh(III)-Catalyzed Decarboxylative <i>ortho</i>-Heteroarylation of Aromatic Carboxylic Acids by Using the Carboxylic Acid as a Traceless Directing Group
作者:Xurong Qin、Denan Sun、Qiulin You、Yangyang Cheng、Jingbo Lan、Jingsong You
DOI:10.1021/acs.orglett.5b00532
日期:2015.4.3
ortho-heteroarylation of aromatic carboxylicacids with various heteroarenes has been developed through Rh(III)-catalyzed two-fold C–H activation, which exhibits a wide substrate scope of both aromatic carboxylicacids and heteroarenes. The use of naturally occurring carboxylicacid as the directinggroup avoids troublesome extra steps for installation and removal of an external directinggroup.