Selective cine Substitution of 1-Arylethenyl Acetates with Arylboron Reagents and a Diene/Rhodium Catalyst
作者:Jung-Yi Yu、Ryosuke Shimizu、Ryoichi Kuwano
DOI:10.1002/anie.201002745
日期:2010.8.23
When the crowd says Bo: A carbon–carbon bond is selectively formed at the β position of 1‐arylethenyl acetate when the alkenyl substrate is reacted with arylboronic acids in the presence of a cycloocta‐1,5‐diene/rhodiumcatalyst. The choice of the ligand is crucial for the unusual cinesubstitution.
Cobalt(<scp>i</scp>)-catalysed CH-alkylation of terminal olefins, and beyond
作者:Maciej Giedyk、Katarzyna Goliszewska、Keith ó Proinsias、Dorota Gryko
DOI:10.1039/c5cc07363d
日期:——
Cobalester, a natural nontoxic vitamin B12 derivative was found to catalyse unusual olefinic sp2 C-H alkylation with diazo reagents as a carbenesource instead of the expected cyclopropanation.
The reaction of biphenyl-alkynes with in situ generated Tf2C=CH2 followed by neutralization gave polycyclicaromatichydrocarbons (PAHs) decorated by a highly stabilized carbanionic functionality. Thus obtained PAHs showed improved solubility in both aqueous and organic solvents.
的反应联苯炔烃与原位产生的TF 2 C = CH 2,然后中和,得到由高度稳定的负碳离子的功能的装饰多环芳香烃(PAHs)。由此获得的多环芳烃在水性和有机溶剂中均显示出改善的溶解度。
Studies on the 1,2-Migrations in Pd-Catalyzed Negishi Couplings with JosiPhos Ligands
作者:Anders T. Lindhardt、Thomas M. Gøgsig、Troels Skrydstrup
DOI:10.1021/jo801824e
日期:2009.1.2
cross-coupling, which is promoted by palladium catalyst systems generated with JosiPhos ligands. Several of the factors that were demonstrated to be important for the 1,2-migration include (1) the nucleophilicity of the organometallic reagent, which possibly influences the transmetalation step in direct competition with the intermediate β-hydride elimination of the alkenyl Pd(II) species; (2) the structural