Oxidative Desulfurization-Difluorination
of Alkyl Aryl Thioethers: Synthesis of ω-Substituted
1,1-Difluoroalkanes
作者:Günter Haufe、Verena Hugenberg
DOI:10.1055/s-0028-1087278
日期:——
An efficient new pathway towards Ï-substituted gem-difluoroalkanes from corresponding aryl alkyl thioethers by oxidative desulfurization-difluorination with the reagents combination of 1,3-dibromo-5,5-dimethylhydantoin (DBH) as the oxidizer and pyridine-nonakis(hydrogen fluoride) as the fluoride source is described. Two succeeding fluoro-Pummerer-like rearrangements are suggested as a possible reaction mechanism.
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
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