Silver-Mediated Methoxycarbonyltetrafluoroethylation of Arenes
作者:Andreas Hafner、Thomas J. Feuerstein、Stefan Bräse
DOI:10.1021/ol401558z
日期:2013.7.5
of silver(I) fluoride, highly fluorinated olefins react readily under solvent-free conditions with arenes via CH-substitution. This transformation could be used to synthesize various methoxycarbonyltetrafluoroethylated aromatic triazenes and anisoles under high functional group tolerance. The method could be applied to the synthesis of a formal fluorinatedbioisostere of the NSAID flurbiprofen. To
ation of functionalized aromatictriazenes is described. Using silver(I)-fluoride and different fluorinated (trimethyl)silyl substituted species, it was possible to synthesize various ortho-fluorinated triazenes in good yields via simple CH-substitution. Initial reactions under solvent-free (neat) conditions indicate a stabilizing interaction between “AgRf” and the triazene moiety, which may be responsible
Ortho-Trifluoromethylation of Functionalized Aromatic Triazenes
作者:Andreas Hafner、Stefan Bräse
DOI:10.1002/anie.201107414
日期:2012.4.10
A silver key to add CF3: In presence of in situ generated AgCF3, it is possible to trifluoromethylate aromatictriazenes in high ortho selectivity and good yields by means of a CH substitution (see scheme). Owing to the further transformation possibilities offered by triazenes, a variety of CF3‐substituted building blocks are then accessible.
Preparation of Aromatic Triazenes and Their Application in Silver-Mediated Perfluoroalkylation Reactions
作者:Stefan Bräse、Andreas Hafner、Christoph Hussal
DOI:10.1055/s-0033-1341249
日期:——
Herein, the syntheses of various functionalized 1,3-diisopropyltriaz-1-enes is described. This simple transformation tolerates a vast number of functional groups (e.g., halides) and allows the syntheses of 1,3-diisopropyltriaz-1-enes starting from commercially available aniline derivatives. These substrates are suitable for a range of silver-mediated perfluoroalkylation reactions.
Copper-Catalyzed Cascade Cyclization Reaction of 2-Haloaryltriazenes and Sodium Azide: Selective Synthesis of 2 <i>H</i>-Benzotriazoles in Water
A new approach to the synthesis of 2 H‐benzotriazoles is described. This strategy is based on the copper‐catalyzed CN coupling of 2‐haloaryltriazenes or 2‐haloazo compounds with sodium azide and the intramolecular addition of nitrene to NN bonds. This approach allows the synthesis of various N‐amino‐ and N‐aryl‐2 H‐benzotriazoles in water, in good to excellent yields. The procedure is simple and