Fluoroform: an Efficient Precursor for the Trifluoromethylation of Aldehydes
摘要:
Fluoroform is shown to be an efficient trifluoromethylating agent when deprotonated using standard reagents in DMF. The important role of DMF as a solvent but also as a reactant was demonstrated. (C) 1999 Elsevier Science Ltd. All rights reserved.
Palladium-Catalyzed Trimethylenemethane Cycloaddition of Olefins Activated by the σ-Electron-Withdrawing Trifluoromethyl Group
作者:Barry M. Trost、Laurent Debien
DOI:10.1021/jacs.5b07573
日期:2015.9.16
α-Trifluoromethyl-styrenes, trifluoromethyl-enynes, and dienes undergo palladium-catalyzed trimethylenemethane cycloadditions under mild reaction conditions. The trifluoromethyl group serves as a unique σ-electron-withdrawing group for the activation of the olefin toward the cycloaddition. This method allows for the formation of exomethylene cyclopentanes bearing a quaternary center substituted by
Nucleophilic fluorination facilitated by a CsF–CaF<sub>2</sub> packed bed reactor in continuous flow
作者:M. B. Johansen、A. T. Lindhardt
DOI:10.1039/c7cc09035h
日期:——
A simple to prepare, dry and handle packed bed reactor carrying CsF on CaF2, towards nucleophilic fluorinations in continuous flow, is reported. The reactor also proved adaptable for silyl-ether deprotection and trifluoromethylations with Ruppert's reagent. The study includes reactor stability and scale-up investigations.
A two-step process for the synthesis of aryl and heteroaryl trifluoromethyl ketones from the corresponding aldehydes is described. Trifluoromethyl alcohols were prepared from aryl and heteroaryl aldehydes in excellent yields using catalytic amount of K2CO3. The trifluoromethyl alcohols were then oxidized conveniently and efficiently by o-iodoxybenzoic acid (IBX) under mild conditions to get the desired
描述了由相应的醛合成芳基和杂芳基三氟甲基酮的两步法。使用催化量的K 2 CO 3由芳基和杂芳基醛以极好的收率制备三氟甲醇。然后在温和的条件下,通过邻碘氧苯甲酸(IBX)方便有效地氧化三氟甲醇,得到所需的官能化芳基和杂芳基三氟甲基酮。
Visible light-promoted umpolung coupling of aryl tri-/difluoroethanones with 2-alkenylpyridines
作者:Xiao Xu、Qing-Qiang Min、Na Li、Feng Liu
DOI:10.1039/c8cc06748a
日期:——
Tertiaryalcohols bearing a trifluoromethyl group are of considerable medicinal interest. Using an umpolung strategy, we herein report the first intermolecular reductive cross-coupling of aryl tri-/difluoroethanones with 2-alkenylpyridines with the aid of a Brønsted acid catalyst upon visible-light irradiation. This metal-free reaction is operationally simple and performed at ambient temperature, allowing
Fluoroform: an efficient precursor for the trifluoromethylation of aldehydes
作者:Benoît Folléas、Ilan Marek、Jean-F Normant、Laurent Saint Jalmes
DOI:10.1016/s0040-4039(98)00391-8
日期:1998.5
Fluoroform is shown to be an efficient trifluoromethylating agent when deprotonated using standard reagents in DMF. The important role of DMF in that reaction was demonstrated. (C) 1998 Published by Elsevier Science Ltd. All rights reserved.