Pd-Catalyzed reductive heck reaction of olefins with aryl bromides for Csp<sup>2</sup>–Csp<sup>3</sup> bond formation
作者:Liqun Jin、Jiaxia Qian、Nan Sun、Baoxiang Hu、Zhenlu Shen、Xinquan Hu
DOI:10.1039/c8cc02571a
日期:——
We developed a Pd-catalyzed intermolecular reductive Heck reaction to construct Csp2–Csp3 bonds between arylbromides and olefins. Various styrene derivatives, acyclic and cyclic alkenes, were well tolerated to couple with varied arylbromides in linear selectivity. Kinetic and deuterium labeling experiments suggested that i-PrOH provides a hydride through β-H elimination.
Asymmetric Synthesis of Alkyl Fluorides: Hydrogenation of Fluorinated Olefins
作者:Sudipta Ponra、Jianping Yang、Sutthichat Kerdphon、Pher G. Andersson
DOI:10.1002/anie.201903954
日期:2019.7
chiral fluorine‐containing molecules is important for several scientific disciplines. We herein disclose a straightforward method for the preparation of chiral organofluorine molecules that is based on the iridium‐catalyzed asymmetric hydrogenation of trisubstituted alkenyl fluorides. This catalytic asymmetric process enables the synthesis of chiral fluorine molecules with or without carbonyl substitution
Iron−Phosphine, −Phosphite, −Arsine, and −Carbene Catalysts for the Coupling of Primary and Secondary Alkyl Halides with Aryl Grignard Reagents
作者:Robin B. Bedford、Michael Betham、Duncan W. Bruce、Andreas A. Danopoulos、Robert M. Frost、Michael Hird
DOI:10.1021/jo052250+
日期:2006.2.1
Simple catalysts formed in situ from iron chloride and a wide range of monodentate and bidentate phosphines and arsines have been screened in the coupling of alkyl halides bearing β-hydrogens with arylGrignardreagents. The best of these show excellent activity, as do catalysts formed in situ with monodentate trialkyl and triaryl phosphite ligands. N-heterocyclic carbene-based precatalysts, either
Iron nanoparticles in the coupling of alkyl halides with aryl Grignard reagents
作者:Robin B. Bedford、Michael Betham、Duncan W. Bruce、Sean A. Davis、Robert M. Frost、Michael Hird
DOI:10.1039/b601014h
日期:——
nanoparticles, either formed in situ stabilized by 1,6-bis(diphenylphosphino)hexane or polyethylene glycol (PEG), or preformed stabilized by PEG, are excellent catalysts for the cross-coupling of aryl Grignardreagents with primary and secondaryalkylhalides bearing beta-hydrogens and they also prove effective in a tandem cyclization/cross-coupling reaction.
Diphenylacetylenes can be reduced to the corresponding diphenylethanes (2) in water in excellent yield using Al powder and Pd/C at 60 °C for 3 h in a sealed tube. In addition, the complete reduction of both aromatic rings required 80 °C for 15 h with Al powder in the presence of Pt/C. However, the nature of hydrogenated product formed was found to be strongly influenced by the reaction temperature