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.
Divergent upgrading pathways of sulfones with primary alcohols: nickel-catalyzed α-alkylation under N<sub>2</sub> and metal-free promoted β-olefination in open air
作者:Haiping Yu、Kaiyue Fu、Guang Yang、Mengyu Liu、Peng Yang、Tao Liu
DOI:10.1039/d2cc05882k
日期:——
Coupling of sulfones and alcohols catalyzed by Ni(OAc)2/P(t-Bu)3 undergoes α-alkylation while β-olefination proceeds in the presence of a base and air.
Herein, α-deuteration of ketones, sulfones, sulfoxides and nitriles catalyzed by BaO was achieved. The desired deuterated products were obtained with high yield and high d-incorporation. The protocol had broad functional group tolerance and was scalable and applicable in preparing exemplary bioactive ketone candidates.
在此,实现了 BaO 催化的酮、砜、亚砜和腈的 α-氘化。以高产率和高 d-掺入获得所需的氘化产物。该协议具有广泛的功能组耐受性,并且可扩展并适用于制备示例性生物活性酮候选物。