Sulfoxide-Directed Metal-Free<i>ortho</i>-Propargylation of Aromatics and Heteroaromatics
作者:Andrew J. Eberhart、Harry J. Shrives、Estela Álvarez、Amandine Carrër、Yuntong Zhang、David J. Procter
DOI:10.1002/chem.201406424
日期:2015.5.11
exploits intermolecular delivery of a propargyl nucleophile to sulfur followed by an intramolecular relay to carbon. The operationally simple cross‐coupling procedure is general, regiospecific with regard to the propargyl nucleophile, and shows complete selectivity for products of ortho‐propargylation over allenylation. The use of secondary propargyl silanes allows metal‐free ortho‐coupling to form carbon–carbon
Visible-Light-Promoted Cross-Coupling Reactions of Aryldiazonium Salts with <i>S</i>-Methyl-<i>d</i><sub>3</sub> Sulfonothioate or <i>Se</i>-Methyl-<i>d</i><sub>3</sub> Selenium Sulfonate: Synthesis of Trideuteromethylated Sulfides, Sulfoxides, and Selenides
作者:Cheng-Mi Huang、Jian Li、Jing-Jing Ai、Xin-Yu Liu、Weidong Rao、Shun-Yi Wang
DOI:10.1021/acs.orglett.0c03562
日期:2020.11.20
A novel visible-light-photocatalytic deuterated thiomethylation/methylselenation of aryldiazonium salts utilizing S/Se-methyl-d3 sulfonothioate has been developed. The mild conditions and the various functional groups provide a green protocol for the efficient and rapid introduction of the S-CD3 or Se-CD3 group with useful levels of deuterium content (>91% D). Trideuteromethyl sulfoxides have also
Computational and Experimental Study of Turbo‐Organomagnesium Amide Reagents: Cubane Aggregates as Reactive Intermediates in Pummerer Coupling
作者:Ferran Planas、Stefanie V. Kohlhepp、Genping Huang、Abraham Mendoza、Fahmi Himo
DOI:10.1002/chem.202004164
日期:2021.2.5
The dynamic equilibria of organomagnesium reagents are known to be very complex, and the relative reactivity of their components is poorly understood. Herein, a combination of DFT calculations and kinetic experiments is employed to investigate the detailed reaction mechanism of the Pummerer couplingbetween sulfoxides and turbo‐organomagnesium amides. Among the various aggregates studied, unprecedented
Evidence for the involvement of a sulfurane intermediate in the oxidation of simple sulfides by methyl(trifluoromethyl)dioxirane
作者:Gregorio Asensio、Rossella Mello、María Elena González-Núñez
DOI:10.1016/0040-4039(96)00248-1
日期:1996.3
Methyl(trifluoromethyl)dioxirane reacts with sulfides to give preferentially sulfones, even in the presence of competing sulfoxides. The sulfoxide yield increases at the expense of the sulfone when 2,2,2-trifluoroethanol is used as co-solvent. The reaction of dioxirane 1b with phenylmethyl sulfide in the presence of 1,1,1-trifluoropropanone-18O-hydrate (48% atom labelled), leads to the obtention of
Reaction of Singlet Oxygen with Thioanisole in Ionic Liquids: a Solvent Induced Mechanistic Dichotomy
作者:Enrico Baciocchi、Cinzia Chiappe、Tiziana Del Giacco、Chiara Fasciani、Osvaldo Lanzalunga、Andrea Lapi、Bernardo Melai
DOI:10.1021/ol900140w
日期:2009.3.19
with singletoxygen in pyrrolidinium- and imidazolium-based ionic liquids has been carried out. In these solvents, thioanisole shows a strongly enhanced reactivity with respect to molecular aprotic solvents, probably due to a stabilization of the persulfoxide intermediate in the ionic medium. Product isotopeeffects suggest a mechanistic change ongoing from pyrrolidinium to imidazolium solvents.