Fluorination of Orthothioesters through Oxidative Desulfurization–Fluorination
作者:Satoru Furuta、Manabu Kuroboshi、Tamejiro Hiyama
DOI:10.1246/bcsj.71.1939
日期:1998.8
The oxidative desulfurization-fluorination of orthothioesters of type RCH2C(SMe)3 using n-Bu4NH2F3 and 1,3-dibromo-5,5-dimethylhydantoin gave bromodifluorination products RCHBrCF2SMe in good yields. The products were converted into bromodifluoro olefins RCBr=CF2 via oxidation and thermolysis. In a similar way, the orthothioesters of type RCH(OH)C(SMe)3 or RCH(OAc)C(SMe)3 were fluorinated to afford difluoro ketones RCOCF2SMe or difluoro acetates RCH(OAc)CF2SMe, respectively. The difluoro acetates were reduced to RCH(OAc)CF2H by radical reduction. The mechanisms are discussed for difluorination accompanied by bromination or oxidation.
Difluorination of 2-substituted 1,1,1-tris(methylthio)ethanes by oxidative desulfurization-fluorination. A new route to partially fluorinated olefins
作者:Satoru Furuta、Tamejiro Hiyama
DOI:10.1016/0040-4039(96)01788-1
日期:1996.10
Oxidativedesulfurization-fluorination of RCH2C(SMe)3 using n-Bu4NH2F3 and 1,3-dibromo-5,5-dimethylhydantoin gave RCHBrCF2SMe in good yields. The products were converted into difluorobromo olefins. Under similar conditions ArCH2C(SMe)3 afforded ArCBr2CF2SMe. The mechanism of the partial difluorination accompanied by bromination is discussed.
From Alkyl Halides to Alkyltrifluoromethyls Using Bromine Trifluoride
作者:Aviv Hagooly、Iris Ben-David、Shlomo Rozen
DOI:10.1021/jo026128b
日期:2002.11.1
right conditions, bromine trifluoride can be a useful tool for generating new types of reactions and compounds. Thus, tris(methylthio)alkyl derivatives, easily prepared from the corresponding alkyl bromides, were converted to the corresponding RCHBrCF2SMe or RCHBrCF3 compounds. The bromine atom, however, could be easily reduced forming eventually R'CF2SMe or R'CF3. If desired, the bromine atom can serve