Oxidative desulfurization-fluorination of 1-substituted 2,2,2-tris(methylthio)ethanol induces difluorination under oxidation or rearrangement
作者:Manabu Kuroboshi、Satoru Furuta、Tamejiro Hiyama
DOI:10.1016/0040-4039(95)01234-9
日期:1995.8
Oxidativedesulfurization-fluorination of RCH(OH)C(SMe)3 using n-Bu4NH2F3 and 1,3-dibromo-5,5-dimethylhydantoin gave RC(O)CF2SMe, whereas treatment of the same substrates with Et2NSF3 afforded RCH(SMe)CF2SMe.
Facile Synthesis of<b><i>α</i></b>-Fluoroalkyl Sulfides under the Oxidative Desulfurization–Fluorination Conditions
作者:Satoru Furuta、Manabu Kuroboshi、Tamejiro Hiyama
DOI:10.1246/bcsj.71.2687
日期:1998.11
sulfides. The fluoro-Pummerer rearrangement, when applied to RCH(SMe)CF2SMe, gave trifluoro sulfides RCF(SMe)CF2SMe. When an HF-pyridine reagent was used as the fluorinating agent, an oxidativedesulfurization–fluorination reaction occurred depending on the structure of the substrates.
Synthesis of<i>S</i>-Methyl 2-Hydroxyalkanethioates, 2-Hydroxyalkanoic Acids and Related Compounds via the Addition Reaction of Tris(methylthio)methanide Ion to Alkanals
In connection with the studies on biological activities on myrmicacin and related compounds, the synthetic method for 2-hydroxyalkanoic acids and the corresponding 1,2-diols was studied. The addition reaction of tris(methylthio)methyllithium to the aldehydes (propanal–dodecanal) gave the corresponding 1,1,1-tris(methylthio)-2-alkanols 1a–j. Treatment of 1 with mercury(II) chloride–mercury(II) oxide
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.