A practical synthesis of (Z)-2-bromo-2-CF3-vinyl phenyl sulfide from 2-CF3-vinyl phenyl sulfide was achieved using bromine (Br2) in the presence of LiBr and LiOAc in AcOH in one flask. This method affords a stereodefined product in high yield under mild conditions. The synthetic application of the product was briefly examined, providing a wide range of Sonogashiracross-coupling products using terminal
Reaction of 1-phenylsulfonul-3,3,3-trifluoropropene(1) with carbonyl-stabilized enolate anions smoothly proceeded to give the addition products(7) in good yield while with an alkyl-lithium or Grignard reagent the formation of the vinyl anion(8) was one of the reaction pathways. Reaction of 1 with the chiral nucleophiles(11, 16) was carried out to give the functionalized trifluoromethylated compounds(13
(β-Trifluoromethyl)vinyl sulfoniumsalt as a novel three-carbon fluorinated building block was conveniently prepared from easily available (β-trifluoromethyl)vinyl sulfide and diphenyl iodonium salt in excellent yield. This easily handled crystalline reagent displayed two types of useful transformation involving aziridination and vinylation to afford the corresponding trifluoromethylated compounds in excellent
TBAF-initiated vinylation of aldehydes with trimethyl[(Z)-2-(phenylsulfanyl)-1-(trifluoromethyl)vinyl]silane
作者:Takumi Kikumura、Koki Kamura、Takeshi Hanamoto
DOI:10.1016/j.jfluchem.2022.109959
日期:2022.3
The titular compound trifluromethylated vinylsilane was readily prepared in 84% yield from stereodefined (Z)-2‑bromo-2-(trifluoromethyl)vinyl phenyl sulfide and chlorotrimethylsilane in the presence of magnesium under Barbier-type reaction conditions. The TBAF-initiated reaction of the vinylsilane and various aldehydes proceeded smoothly to give the corresponding 2-(trifluoromethyl)allyl alcohol derivatives
在 BArbier 型反应条件下,在镁存在下,由立体定义的 ( Z )-2-溴-2-(三氟甲基)乙烯基苯硫醚和三甲基氯硅烷很容易以 84% 的收率制备标题化合物三氟甲基化乙烯基硅烷。TBAF引发的乙烯基硅烷和各种醛的反应顺利进行,以中等至良好的收率得到相应的2-(三氟甲基)烯丙醇衍生物。
A Practical Synthesis and Applications of (E)-Diphenyl-β-(trifluoromethyl)vinylsulfonium Triflate
yl)vinylsulfonium triflate, readily prepared from 2-bromo-3,3,3-trifluoroprop-1-ene in two steps, undergoes double alkylation with active methylene compounds in dimethyl sulfoxide or ethyl acetate, in an open vessel at room temperature, to provide the corresponding trifluoromethylated cyclopropane derivatives in excellent yields. The cyclopropane, ethyl 1-cyano-2-(trifluoromethyl)cyclopropanecarboxylate