achieved in high yields via the reaction with difluorocarbene. When aryl or alkyl dithiocarboxylates were treated with trimethylsilyl 2,2-difluoro-2-fluorosulfonylacetate in the presence of 5 mol % of a Proton Sponge catalyst, the in situ generated difluorocarbene reacted with the dithioesters to afford 2-sulfanylated 1,1-difluoro-1-alkenes via difluorothiiranes. This reaction can be considered as an electrophilic
Radical Addition Reactions of α-Substituted β,β-Difluorovinyl Sulfones
作者:In Howa Jeong、Sung Lan Jeon、Bum Tae Kim
DOI:10.1080/00397910008087053
日期:2000.12
Abstract The radical addition reactions of α-substituted β,β-difluorovinyl sulfones 1 with α-oxy and acyl radical species, such as 1,3-dioxolane, tetrahydrofuran, 1,4-dioxane, butanal and hexanal, afforded radical addition products 2--16 in good yields.
Efficient synthesis of novel α-aryl(alkyl)-β, β-difluorovinyl and α-aryl(alkyl)-β-fluoro-β-perfluoroalkylvinyl sulfides
作者:In Howa Jeong、Yong Ki Min、Young Sup Kim、Bum Tae Kim、Kwang Yun Cho
DOI:10.1016/0040-4039(94)80117-7
日期:1994.10
1-vis(phenylthio)perfluoroalkyl aromatics or alkanes with a mixture of 2 equiv. of TiCl4 and 4 equiv. of LiAlH4 in THF at reflux temperature for 3 hours afforded α-aryl(alkyl)-β-fluoro-β-perfluoroalkylvinyl and α-aryl (alkyl)-β-fluoro-β-perfluoroalkylvinylsulfides in good yields.
reaction described herein is an electrophilic counterpart to the Wittig-type (nucleophilic) difluoroalkene synthesis starting from carbonyl compounds. The electrophilic difluoromethylidenation facilitated the synthesis of sulfanylated and diarylated 1,1-difluoroalkenes, including stericallyhindered ones, which are inaccessible by nucleophilic difluoromethylidenation.