silver‐promoted oxidativebenzylicC−H trifluoromethoxylation has been reported for the first time. With trifluoromethyl arylsulfonate as the trifluoromethoxylation reagent, various arenes, having diverse functional groups, undergo trifluoromethoxylation of their benzylicC−H bonds to form trifluoromethyl ethers under mild reaction conditions. In addition, the trifluoromethoxylation and the fluorination of methyl
Direct Dehydroxytrifluoromethoxylation of Alcohols
作者:Xiaohuan Jiang、Zhijie Deng、Pingping Tang
DOI:10.1002/anie.201711050
日期:2018.1.2
developed. This method generated an alkyl fluoroformate in situ from alcohols, followed by nucleophilic trifluoromethoxylation with trifluoromethyl arylsulfonate (TFMS) as the trifluoromethoxylation reagent. The reaction is operationally simple and scalable, and it proceeds under mild reaction conditions to provide access to a wide range of trifluoromethyl ethers from alcohols. In addition, this method
Facile Access to AgOCF<sub>3</sub>and Its New Applications as a Reservoir for OCF<sub>2</sub>for the Direct Synthesis of N−CF<sub>3</sub>, Aryl or Alkyl Carbamoyl Fluorides
showcase its performance in trifluoromethoxylations or as reservoir for O=CF2. This enabled the direct, practical and safe synthesis of valuable N‐alkyl/aryl and N−CF3 carbamoyl fluorides from secondary amines and isothiocyanides, respectively. Our mechanistic data indicate that AgOCF3 does not liberate O=CF2 until it is activated by a nucleophilic co‐reagent, reinforcing the stability of the salt under
Study of a Stable “Trifluoromethoxide Anion Solution” Arising from 2,4‐Dinitro‐Trifluoromethoxybenzene
作者:Clémence Bonnefoy、Emmanuel Chefdeville、Armen Panosian、Gilles Hanquet、Frédéric R. Leroux、Fabien Toulgoat、Thierry Billard
DOI:10.1002/chem.202102809
日期:2021.11.17
A stable solution of the trifluoromethoxide anion was readily obtained by mixing 2,4-dinitro-trifluoromethoxybenzene (DNTFB) and DMAP. A detailed study and characterization of this solution has been described, in particular highlighting the crucial role of the DNTFB/DMAP ratio. This “trifluoromethoxide anionsolution” was applied to perform metal-free SN2 reactions on alkyl bomides with yields up to
通过混合 2,4-二硝基-三氟甲氧基苯 (DNTFB) 和 DMAP,很容易获得三氟甲氧基阴离子的稳定溶液。该解决方案的详细研究和表征已被描述,特别强调了 DNTFB/DMAP 比率的关键作用。这种“三氟甲氧基阴离子溶液”用于对烷基硼化物进行无金属的 S N 2 反应,产率高达 77%。
[(tBu2PhP)Ag(μ-OCF3)]2: A Thermally Stable, Light-Insensitive Nucleophilic Reagent for Trifluoromethoxylation
作者:Daoqian Chen、Yongrui Luo、Long Lu、Qilong Shen
DOI:10.1021/acs.organomet.4c00073
日期:2024.12.23
variety of alkyl electrophiles including benzyl bromodes/chlorides, primary alkyl bromides/iodides/triflates/nosylates, and secondaryalkyl bromides/triflates/nosylates in good to excellent yields. Mechanisticinvestigation by reaction with three enantioenriched secondaryalkyl electrophiles suggested that these reactions proceed via an SN2 pathway, which is consistent with our original mechanistic hypothesis
许多三氟甲氧基化方法经常提出亲核 AgOCF 3作为关键中间体。然而,这种中间体的结构仍然难以捉摸。在此,制备了热稳定、光不敏感的亲核三氟甲氧基化试剂[Ag(PPh t Bu 2 )(OCF 3 )] ( 1 )并进行了充分表征。试剂1与多种烷基亲电子试剂反应,包括苄基溴/氯化物、伯烷基溴/碘化物/三氟甲磺酸酯/对硝基苯磺酸酯和仲烷基溴化物/三氟甲磺酸酯/对硝基苯磺酸酯,产率良好至优异。通过与三种对映体富集的二级烷基亲电子试剂反应进行的机理研究表明,这些反应通过 S N 2 途径进行,这与我们最初的机理假设一致。