Silyl Radical Activation of Alkyl Halides in Metallaphotoredox Catalysis: A Unique Pathway for Cross-Electrophile Coupling
作者:Patricia Zhang、Chi “Chip” Le、David W. C. MacMillan
DOI:10.1021/jacs.6b04818
日期:2016.7.6
merger of photoredox and transition metal catalysis. In this report, we demonstrate the use of commercially available tris(trimethylsilyl)silane with metallaphotoredox catalysis to efficiently couple alkyl bromides with aryl or heteroaryl bromides in excellent yields. We hypothesize that a photocatalytically generated silyl radical species can perform halogen-atom abstraction to activate alkyl halides
Alkylations of Arylboronic Acids including Difluoroethylation/Trifluoroethylation<i>via</i>Nickel-Catalyzed Suzuki Cross-Coupling Reaction
作者:Xiaofei Zhang、Chunhao Yang
DOI:10.1002/adsc.201500346
日期:2015.8.24
An efficient alkylation method of functionalized alkyl halides under mild nickel‐catalyzed C(sp3)C(sp2) Suzuki cross‐coupling conditions is described. The features of this approach are excellent functional group compatibility, low cost nickel catalyst, and the use of a mild base. This is also the first successful example of the nickel‐catalyzed direct 2,2‐difluoroethylation or 2,2,2‐trifluoroethylation
Photoinduced Palladium‐Catalyzed Negishi Cross‐Couplings Enabled by the Visible‐Light Absorption of Palladium–Zinc Complexes
作者:Irini Abdiaj、Lena Huck、José Miguel Mateo、Antonio de la Hoz、M. Victoria Gomez、Angel Díaz‐Ortiz、Jesús Alcázar
DOI:10.1002/anie.201808654
日期:2018.10
A visible‐light‐induced Negishicross‐coupling is enabled by the activation of a Pd0–Zn complex. With this photocatalytic method, the scope of deactivated aryl halides that can be employed in the Negishicoupling was significantly expanded. NMR experiments conducted in the presence and absence of light confirmed that the formation of the palladium–zinccomplex is key for accelerating the oxidative
Di(2-picolyl)amines as Modular and Robust Ligands for Nickel-Catalyzed C(sp<sup>2</sup>)–C(sp<sup>3</sup>) Cross-Electrophile Coupling
作者:Alexander J. Rago、Aristidis Vasilopoulos、Amanda W. Dombrowski、Ying Wang
DOI:10.1021/acs.orglett.2c03346
日期:2022.11.25
reaction, because noncommercial analogues usually entail challenging syntheses. In this work, di(2-picolyl)amines (DPAs) are explored as an alternative modular ligand class for the nickel-catalyzed aryl–alkyl cross-electrophile coupling. Novel DPA ligands were synthesized directly from inexpensive amine and pyridine building blocks in a single step. This facile synthetic route enabled the parallel synthesis