Synthesis of polyfluorinated o-hydroxyacetophenones – convenient precursors of 3-benzylidene-2-phenylchroman-4-ones
作者:Larisa Politanskaya、Evgeny Tretyakov、Chanjuan Xi
DOI:10.1016/j.jfluchem.2019.109435
日期:2020.1
to the synthesis of fluorinated o-hydroxyacetophenones in good to excellent yields is reported. We demonstrated a convenient method for replacing the iodine atom in o-iodophenols with MeC(=O)– group through the introduction and subsequent hydrolysis of TIPS–C≡C– moiety by of p-toluenesulfonic acid monohydrate. The resulting compounds may serve as precursors for the synthesis of polyfluorinated 3-ben
Efficient and Reliable Iodination and O-Methylation of Fluorinated Phenols
作者:Robert Francke、Gregor Schnakenburg、Siegfried R. Waldvogel
DOI:10.1002/ejoc.201000161
日期:2010.4
Fluorinatedphenols and other electron-deficient phenolic substrates are efficiently and cleanly iodinated by an iodine/ iodide mixture employing alkaline conditions. This protocol turned out to be the most practical for the generation of such highly fluorinated iodophenols. For later application in coupling processes the protection of the phenolic hydroxy moiety is often required. Therefore, a practical
3-Butadienes have become valuable buildingblocks in the synthesis of various heterocyclic compounds. The Pd-catalyzed cross-coupling and cyclization reaction of N-(2,3-butadienyl)carboxamide of isopimaric acid with fluorine-substituted 2-iodophenols proceeds with the formation of optically active fluorinated benzofuran and benzopyrane derivatives of isopimaric acid. This transformation opens a potential
Synthesis of Highly Fluorinated 2,2′-Biphenols and 2,2′-Bisanisoles
作者:Robert Francke、Gregor Schnakenburg、Siegfried R. Waldvogel
DOI:10.1021/ol101698a
日期:2010.10.1
Multiply fluorine-substituted iodo anisoles are efficiently coupled in an Ullmann-type reaction to provide the corresponding bisanisoles. The coupling is selective and even tolerates bromo moieties. Subsequent deprotection of hydroxy groups gives access to highly fluorinated biphenols.