Synthesis and Transformation of [Difluoro(phenylseleno)methyl]- trimethylsilane
摘要:
[GRAPHIC]A novel and efficient strategy was developed to synthesize [difluoro(phenylseleno)methyl]trimethylsilane (PhSeCF2-TMS, 2), which was further utilized as a nucleophilic difluoromethylating reagent to incorporate the difluoro(phenylseleno)methyl (PhSeCF2) group into carbonyl compounds in good yields. The resulting PhSeCF2-containing alcohols 3 could be conveniently converted into corresponding difluoromethyl alcohols 4 by a radical deselenylation.
[GRAPHIC]A novel and efficient strategy was developed to synthesize [difluoro(phenylseleno)methyl]trimethylsilane (PhSeCF2-TMS, 2), which was further utilized as a nucleophilic difluoromethylating reagent to incorporate the difluoro(phenylseleno)methyl (PhSeCF2) group into carbonyl compounds in good yields. The resulting PhSeCF2-containing alcohols 3 could be conveniently converted into corresponding difluoromethyl alcohols 4 by a radical deselenylation.
Reductive Radical Reaction of <i>gem</i>-Difluorinated Organoselenium Compounds with an Indium(III) Chloride-Sodium Borohydride System
As for gem-difluorinated phenylseleno compounds, indium hydride, in situ generated by transmetallation between InCl3 and NaBH4, was found to be a convenient radical reagent as an alternative to tributyltin hydride. Besides its excellent performance in intramolecular cyclization and radical deselenylation, the NaBH4/InCl3 system also succeeded in intermolecular radical addition between organoselenium compounds and styrene.