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.
使用n-Bu_4NH_2F_3和1,3-二溴-5,5-二甲基乙内酰脲对RCH_2C(SMe)_3类型的原硫酯进行氧化脱硫氟化反应,以良好收率得到了溴二氟化产物RCHBrCF_2SMe。通过氧化和热解,产物被转化为溴二氟烯烃RCBr=CF_2。类似地,RCH(OH)C(SMe)_3或RCH(OAc)C(SMe)_3类型的原硫酯被氟化,分别得到二氟酮RCOCF_2SMe或二氟乙酸酯RCH(OAc)CF_2SMe。二氟乙酸酯通过自由基还原被还原为RCH(OAc)CF_2H。讨论了伴随溴化或氧化的二氟化反应机理。