Palladium-catalyzed direct oxidative vinylation of thiophenes and furans under weakly basic conditions
作者:Atsushi Maehara、Tetsuya Satoh、Masahiro Miura
DOI:10.1016/j.tet.2008.01.058
日期:2008.6
The palladium-catalyzed oxidative coupling of thiophenes and furans with alkenes proceeds in the presence of copper and lithium salts as oxidant and additive, respectively, under weakly basic or almost neutral conditions to afford the corresponding vinylated heteroarenes. Under such conditions, diphenyl(hydroxy)methyl and acetal functions on the heteroarene substrates are tolerable. The former function
A palladium-catalyzed direct alkenation of thiophenes and furans has been developed in the presence of AgOAc and pyridine. A variety of olefinic substrates such as acrylates, acrylamides, and acrylonitrile can perform the direct oxidative coupling reactions with various thiophenes and furans to give the mono-alkenylated products in good yields. In most cases, the (E)-isomers were isolated as the major products. (C) 2009 Elsevier Ltd. All rights reserved.
S,O-Ligand-Promoted Pd-Catalyzed C-H Olefination of Thiophenes
SO good. An efficient PdII catalyzed C−Holefination of thiophenes has been developed using an easily accessible bidentate S,O‐ligand. The catalytic system promotes the C‐2 olefination in a wide range of thiophenes including 3‐substituted thiophenes, under mild conditions.