Synthesis of Geminal Difluorides by Oxidative Desulfurization−Difluorination of Alkyl Aryl Thioethers with Halonium Electrophiles in the Presence of Fluorinating Reagents and Its Application for<sup>18</sup>F-Radiolabeling
作者:Verena Hugenberg、Stefan Wagner、Klaus Kopka、Otmar Schober、Michael Schäfers、Günter Haufe
DOI:10.1021/jo100689v
日期:2010.9.17
from alkyl aryl thioethers by a new oxidative desulfurization−difluorination protocol with the reagents combination of 1,3-dibromo-5,5-dimethylhydantoin (DBH) as an oxidizer and pyridine·9HF (Py·9HF) as a fluoride source. The reaction proceeds via a fluoro-Pummerer-type rearrangement followed by an oxidative desulfurization−fluorination step. Starting from α-fluorinated thioethers, this reaction is
通过新的氧化脱硫-二氟化方案,由1,3-二溴-5,5-二甲基乙内酰脲(DBH)作为氧化剂和吡啶的试剂组合,由烷基芳基硫醚以高收率合成了各种ω-取代的1,1-二氟烷烃·9HF(Py·9HF)作为氟化物源。反应通过氟-Pummerer型重排进行,然后进行氧化脱硫-氟化步骤。从α-氟代硫醚开始,该反应有望用于适用于正电子发射断层扫描(PET)的配体的18 F标记(τ1 /2 = 110分钟)。使用DBH和加入载体-PY·9H [组合18 F]女,一个18由相应的α-氟代硫醚合成F标记的二氟化物,放射化学产率为9%。