The chemo- and stereoselective electrochemical allylation/alkylation of ethers is presented via a C(sp3)–H activation event. The electrosynthetic protocol enables the realization of a large library of functionalized ethers (35 examples) in high yields (up to 84%) via cathodic activation of a new type of redox-active carbonate (RAC), capable of triggering HAT (Hydrogen-Atom-Transfer) events through
Catalytic, asymmetric difluorination of alkenes to generate difluoromethylated stereocenters
作者:Steven M. Banik、Jonathan William Medley、Eric N. Jacobsen
DOI:10.1126/science.aaf8078
日期:2016.7
difluoromethylated tertiary or quaternary stereocenters. The reaction uses commercially available reagents (m-chloroperbenzoic acid and hydrogen fluoride pyridine) and a simple chiral aryl iodide catalyst and is carried out readily on a gram scale. Substituent effects and temperature-dependent variations in enantioselectivity suggest that cation-π interactions play an important role in stereodifferentiation
Solvent and ligand partition reaction pathways in nickel-mediated carboxylation of methylenecyclopropanes
作者:Masahiro Murakami、Naoki Ishida、Tomoya Miura
DOI:10.1039/b515684j
日期:——
Methylenecyclopropanes are carboxylated with gaseous carbon dioxide in the presence of a stoichiometric amount of a nickel complex; the reaction pathways are significantly influenced by the reaction solvent and the amine ligand.