Aryl Sulfoxides via Palladium-Catalyzed Arylation of Sulfenate Anions
作者:Guillaume Maitro、Sophie Vogel、Guillaume Prestat、David Madec、Giovanni Poli
DOI:10.1021/ol062315a
日期:2006.12.1
[Structure: see text] Palladium-catalyzedarylation of sulfenate anions generated from beta-sulfinyl esters can take place under biphasic conditions. This hitherto unknown reaction provides a simple, mild, and efficient route to aryl sulfoxides in good yields. The development of a new pseudo-domino type I procedure involving a sulfinylation followed by a Mirozoki-Heck coupling is also described.
Aryl Sulfoxides from Allyl Sulfoxides via [2,3]-Sigmatropic Rearrangement and Domino Pd-Catalyzed Generation/Arylation of Sulfenate Anions
作者:Elise Bernoud、Gaëtan Le Duc、Xavier Bantreil、Guillaume Prestat、David Madec、Giovanni Poli
DOI:10.1021/ol902620t
日期:2010.1.15
Allylic sulfoxides, via [2,3]-sigmatropic rearrangement and oxidative addition of the resulting allylic sulfenate esters to Pd(0), are found to be excellent precursors of sulfenate anions. This hitherto unknown reactivity is applied in a new Pd(0)-catalyzed domino sequence involving sulfenate anion generation followed by arylation to afford aryl sulfoxides.
oxygenation of aryl methyl sulfides and diaryl sulfides by peroxomonophosphoricacid in acetonitrile–water mixture follows an overall second-order kinetics, first-order in each reactant. The study of the influence of [H+] on the oxidation of phenyl methyl and diphenyl sulfides reveals that H2PO5− and HPO52− are the oxidising species in the oxidation process. In substituted phenyl methyl sulfides and diphenyl
过氧一磷酸在乙腈-水混合物中对芳基甲基硫醚和二芳基硫醚的氧化遵循总体二级动力学,即每个反应物的一级动力学。[H的影响的研究+ ]上苯基甲基和二苯基硫化物的氧化揭示ħ 2 PO 5 -和HPO 5 2-是在氧化过程中的氧化物质。在取代的苯基甲基硫醚和二苯基硫醚中,给电子取代基加速了氧合速度,而吸电子基团则阻碍了氧合速度,表明硫化物硫对过氧化物氧的亲核取代。负ρ在速率常数与σ常数的相关性分析中获得的C值也表明在限速步骤中形成了带更多正电荷的硫。与不同的烷基的苯基硫化物研究(C 6 H ^ 5 SR; R =甲基,乙基,镨我或卜吨)指示该速率由笨重的R基团延迟。在苯基巯基乙酸钠的过氧单磷酸氧化中也获得了相似的动力学结果。在动力学研究的基础上,提出了一种常见的机理。
Metal-free O–H/C–H difunctionalization of phenols by o-hydroxyarylsulfonium salts in water
An environmentally benign method for C–H/O–H difunctionalization of phenols with sulfoxides under mild conditions has been developed. The reaction process is mediated by an electrophilic aromatic substitution and subsequent selective aryl or alkyl migration, involving C–S and C–O bond formations with broad substrate scope.