A new fluorinated silicon reagent bearing a functionalized tetrafluoroethylene fragment was prepared from two CF building blocks: ethyl bromodifluoroacetate and (bromodifluoromethyl)trimethylsilane. The key C-C bond-forming step involves a difluorocarbene addition/cyclopropane rearrangement sequence. The silicon reagent was coupled with aldehydes and reactive azomethines in the presence of potassium fluoride.
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