CO<sub>2</sub>
Conversion into Esters by Fluoride-Mediated Carboxylation of Organosilanes and Halide Derivatives
作者:Xavier Frogneux、Niklas von Wolff、Pierre Thuéry、Guillaume Lefèvre、Thibault Cantat
DOI:10.1002/chem.201505092
日期:2016.2.24
A one‐step conversion of CO2 into heteroaromatic esters is presented under metal‐free conditions. Using fluoride anions as promoters for the C−Si bond activation, pyridyl, furanyl, and thienyl organosilanes are successfully carboxylated with CO2 in the presence of an electrophile. The mechanism of this unprecedented reaction has been elucidated based on experimental and computational results, which
Synthesis of Aromatic Sulfones from SO<sub>2</sub>
and Organosilanes Under Metal-free Conditions
作者:Niklas von Wolff、Joëlle Char、Xavier Frogneux、Thibault Cantat
DOI:10.1002/anie.201702311
日期:2017.5.8
The conversion of SO2 into arylsulfones undermetal‐freeconditions was achieved for the first time by reacting SO2 with (hetero)arylsilanes and alkylhalides in the presence of a fluoride source. The mechanism of this transformation was elucidated based on DFT calculations, which highlight the influence of SO2 in promoting C−Si bond cleavage.
5-Methyl-2-trimethylsilyl-pyridine (1) has recently been prepared via the “in situ” Grignard reaction of 1-bromo-5-methyl-pyridine with magnesium and trimethylchlorosilane in refluxing tetrahydrofuran (thf) and structurally characterized. 2-Trimethylgermyl- (2) and 2- trimethylstannyl-pyridine (3) were now obtained from 2-bromo-pyridine through metallation (with n-BuLi) and treatment of the intermediates