Oxidative Addition to Palladium(0) Made Easy through Photoexcited-State Metal Catalysis: Experiment and Computation
作者:Rajesh Kancherla、Krishnamoorthy Muralirajan、Bholanath Maity、Chen Zhu、Patricia E. Krach、Luigi Cavallo、Magnus Rueping
DOI:10.1002/anie.201811439
日期:2019.3.11
conditions. Mechanistic investigations and density functional theory (DFT) studies suggest that a photoinduced inner‐sphere mechanism is operative in which a barrierless, single‐electron transfer oxidativeaddition of the alkyl halide to Pd0 is key for the efficient transformation.
Visible Light‐Driven, Room Temperature Heck‐Type Reaction of Alkyl Halides with Styrene Derivatives Catalyzed by B
<sub>12</sub>
Complex
作者:Li Chen、Yoshio Hisaeda、Hisashi Shimakoshi
DOI:10.1002/adsc.201801707
日期:2019.6.18
A visible light driven Heck‐type coupling reaction of alkyl halides with styrene and its derivatives catalyzed by the cobalamin derivative (B12) with the [Ru(bpy)3]Cl2 photosensitizer at room temperature is reported. The catalytic efficiencies of the B12 catalyst were compared to that of other cobalt complexes such as cobaloxime. Various control experiments supported a radical‐based mechanism similar
Asymmetric copper-catalyzed allylic alkylation between allyl bromides and alkyl Grignard reagents using a P-chiral monophosphorus ligand is described. A range of terminal olefins bearing tertiary or quaternary carbon centers were formed in good branched/linear selectivities and excellent enantioselectivities at copper loadings as low as 0.5 mol %.
Tandem Intramolecular Carbolithiation-Lithium/Zinc Transmetallation and Applications to Carbon−Carbon Bond-Forming Reactions
作者:Miguel Yus、Rosa Ortiz
DOI:10.1002/ejoc.200400349
日期:2004.9
Lithium/zinc transmetallation with the cyclic organolithium intermediate 3 (prepared by intramolecular carbolithiation of the initially formed organolithium 2) gives the corresponding organozinc intermediate 5. Copper- or palladium-promoted SN2′ reactions between compound 5 and allylic or propargylic halides, as well as arylation, vinylation, benzylation, acylation, and conjugate addition to α,β-unsaturated