Quaternary Ammonium Trifluoromethoxide Salts as Stable Sources of Nucleophilic OCF<sub>3</sub>
作者:Josiah J. Newton、Benson J. Jelier、Michael Meanwell、Rainer E. Martin、Robert Britton、Chadron M. Friesen
DOI:10.1021/acs.orglett.0c00099
日期:2020.3.6
methyl ethers provides quaternaryammonium trifluoromethoxide (NR4OCF3) and pentafluoroethoxide (NR4OCF2CF3) salts, respectively, in good yields. The new trifluoromethoxide salts disclosed herein are uniquely stable for extended periods of time in both the solid state and in solution, which complements contemporary reagents. Here we describe the preparation of a range of NR4OCF3 salts, their long-term stability
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
作者:Alexander A. Kolomeitsev、Mikhail Vorobyev、Hartmut Gillandt
DOI:10.1016/j.tetlet.2007.11.105
日期:2008.1
Hydrolytically stable and easy to handle trifluoromethyl triflate was found to be a liquid reservoir of 'masked' difluorophosgene. Anhydrous F(-) sources cleave the S-O bond in trifluoromethyl triflate yielding quantitatively the trifluoromethanolate salts, being useful trifluoromethoxy group carriers. Reaction of trifluoromethanolates with in situ generated from o-trimethylsilylphenyl triflate benzyne leads to (trifluoromethoxy)benzene and fluorobenzene (ratio 85:15). Whereas an addition of trifluoromethanethiolate anion across a triple bond of benzyne leads to [(trifluoromethyl)sulfanyl]benzene solely. (C) 2007 Elsevier Ltd. All rights reserved.
[EN] PHARMACEUTICAL COMPOSITION FOR TREATMENT OR PREVENTION OF ATOPIC DERMATITIS<br/>[FR] COMPOSITION PHARMACEUTIQUE POUR LE TRAITEMENT OU LA PRÉVENTION DE LA DERMATITE ATOPIQUE<br/>[JA] アトピー性皮膚炎の治療または予防のための医薬組成物