Copper-mediated trifluoromethylation of propiolic acids: facile synthesis of α-trifluoromethyl ketones
作者:Zhengbiao He、Rui Zhang、Mingyou Hu、Lingchun Li、Chuanfa Ni、Jinbo Hu
DOI:10.1039/c3sc51613j
日期:——
Copper-mediated decarboxylative trifluoromethylation provides a new protocol for the efficient preparation of α-trifluoromethyl ketones from propiolic acids. It was found that water is involved as a reactant in the reaction, which is significantly different from the previously reported decarboxylative fluoroalkylation reactions.
An economical approach to α‐CF3‐substituted ketones, which are important intermediates in synthetic and medicinal chemistry, employs olefins and the readily available Langlois reagent (CF3SO2Na). The reaction is operationally simple, proceeds at room temperature, and exhibits an excellent tolerance toward a wide variety of functional groups.
一种经济的方法,以α-CF 3 -取代的酮,这是在合成和药物化学的重要中间体,采用烯烃和容易得到的试剂朗格卢瓦(CF 3 SO 2 Na)的。该反应操作简单,在室温下进行,并且对多种官能团表现出优异的耐受性。
Trifluoromethylation of α-Haloketones
作者:Petr Novák、Anton Lishchynskyi、Vladimir V. Grushin
DOI:10.1021/ja307783w
日期:2012.10.3
The C-X bond (X = Br, Cl) of α-haloketones is smoothly trifluoromethylated with the fluoroform-derived CuCF(3) reagent recently developed in our laboratories. This is the first nucleophilic α-trifluoromethylation reaction of carbonyl compounds and a rare example of CF(3)-C(sp(3)) coupling. The transformation employs only low-cost chemicals and cleanly occurs in up to 99% yield at room temperature,
An unprecedented Pd-catalyzed activation of a CF3 group is reported herein. The key to the success of this reaction is the combination of consecutive β-F elimination and C–Fbond oxidative addition of a trifluoromethyl group. It also represents the first general application of α-trifluoromethyl ketones as building blocks by C–Fbondactivation.
Synthesis of Trifluoroethyl-Substituted Ketones from Aldehydes and Cyclohexanones
作者:Bill Morandi、Erick M. Carreira
DOI:10.1002/anie.201103526
日期:2011.9.19
A trifluoromethylated symphony! A new transformation involving trifluoromethyl diazomethane generated in situ has been developed that allows direct access to trifluoroethyl ketone derivatives from aldehyde and cyclohexanone compounds (see scheme).