PhSCF2SiMe3 (1) underwent fluoride-catalyzed nucleophilic addition to the carbonyl group of anhydrides to provide the corresponding γ-difluoro(phenylsulfanyl)methyl γ-lactols, which were employed for the synthesis of γ-difluoromethylated γ-lactams.
Direct nucleophilic gem-difluoro(phenylsulfanyl)methylation of carbonylcompounds has been achieved by use of difluoro(phenylsulfanyl)methane (PhSCF2H) and the phosphazenebase P4-tBu in THF. Non-enolizable aldehydes and ketones are suitable substrates to undergo nucleophilic gem-difluoro(phenylsulfanyl)methylation, providing α-gem-difluoromethylated adducts in good yields. In addition, this methodology
PhSCF2TMS was utilized as a useful gem-difluoromethylene building block for the synthesis of gem-difluoromethylenated spiro-γ-butyrolactones. The radical cyclization of γ-alkenyl-γ-gem-difluoro(phenylsulfanyl)methyl-γ-butyrolactones provided gem-difluoromethylenated spiro-γ-butyrolactones.