<sup>18</sup>
F‐Labeling of Aryl‐SCF
<sub>3</sub>
, ‐OCF
<sub>3</sub>
and ‐OCHF
<sub>2</sub>
with [
<sup>18</sup>
F]Fluoride
作者:Tanatorn Khotavivattana、Stefan Verhoog、Matthew Tredwell、Lukas Pfeifer、Samuel Calderwood、Katherine Wheelhouse、Thomas Lee Collier、Véronique Gouverneur
DOI:10.1002/anie.201504665
日期:2015.8.17
AbstractWe report that halogenophilic silver(I) triflate permits halogen exchange (halex) nucleophilic 18F‐fluorination of aryl‐OCHFCl, ‐OCF2Br and ‐SCF2Br precursors under mild conditions. This AgI‐mediated process allows for the first time access to a range of 18F‐labeled aryl‐OCHF2, ‐OCF3 and ‐SCF3 derivatives, inclusive of [18F]riluzole. The 18F‐labeling of these medicinally important motifs expands the radiochemical space available for PET applications.
Metal‐Free Twofold Electrochemical C−H Amination of Activated Arenes: Application to Medicinally Relevant Precursor Synthesis
作者:Lars J. Wesenberg、Erika Diehl、Till J. B. Zähringer、Carolin Dörr、Dieter Schollmeyer、Akihiro Shimizu、Jun‐ichi Yoshida、Ute A. Hellmich、Siegfried R. Waldvogel
DOI:10.1002/chem.202003852
日期:2020.12.23
materials suffers from wasteful or toxic precursors for the synthesis. In particular, the aromatic non‐protected primary amine function represents a versatile synthetic precursor, but its synthesis typically requires toxic oxidizingagents and transition metal catalysts. The twofold electrochemical amination of activated benzene derivatives via Zincke intermediates provides an alternative sustainable
Xenon Difluoride Mediated Fluorodecarboxylations for the Syntheses of Di- and Trifluoromethoxyarenes
作者:Claire Chatalova-Sazepin、Meruyert Binayeva、Maxim Epifanov、Wei Zhang、Paul Foth、Carolyn Amador、Manu Jagdeo、Benjamin R. Boswell、Glenn M. Sammis
DOI:10.1021/acs.orglett.6b02208
日期:2016.9.16
Selectfluor in fluorodecarboxylations of both mono- and difluoroaryloxy acetic acid derivatives. This method efficiently converts a wide range of neutral and electron-poor substrates to afford the desired di- and trifluoromethyl aryl ethers in good to excellent yields. The purifications are facile, and the reaction times are less than 5 min, which makes these fluorodecarboxylations promising for future PET-imaging