Zirconium-Mediated Cross-Coupling of Terminal Alkynes and Vinyl Bromides: Selective Synthesis of Cyclobutene and 1,3-Diene Derivatives
作者:José Barluenga、Félix Rodríguez、Lucía Álvarez-Rodrigo、Francisco J. Fañanás
DOI:10.1002/chem.200305337
日期:2004.1.5
diastereoselective synthesis of 1,3-butadiene or cyclobutene derivatives by a zirconium-mediated reaction of alkenyllithium compounds and vinylbromides is reported. The key steps involve the generation of zirconocene-alkyne complexes from haloalkenes and subsequent coupling with alkenyl bromides. Thus, formally the process supposes the cross-coupling reaction between a terminalalkyne and an alkenyl bromide. Moreover
Changing selectivity in palladiu-catalyzed reactioins involving oxidation state IV. A new synthesis from iodobenzene and norbornene
作者:Marta Catellani、Gian Paolo Chiusoli、Carlo Castagnoli
DOI:10.1016/0022-328x(91)86321-g
日期:1991.4
The formation of organopalladium intermediates in a catalytic reaction between iodobenzene and norbornene, involving a palladium(0)-(II)-(IV)-(II)-(0) sequence, can be directed towards preferential formation of product V or IV.
Strain-Inducing Positional Alkene Isomerization
作者:Vignesh Palani、Alison E. Wendlandt
DOI:10.1021/jacs.3c06935
日期:2023.9.13
many strained organic molecules renders them challenging to prepare. Here, we report a strain-inducing positional alkeneisomerization reaction that provides mild and selective access to cyclobutene building blocks from readily obtained cyclobutylidene precursors. This endergonic isomerization relies on the sequential and synergistic action of a decatungstate polyanion photocatalyst and cobaloxime co-catalyst