Efficient asymmetric synthesis of aryl difluoromethyl sulfoxides and their use to access enantiopure α-difluoromethyl alcohols
作者:Chloé Batisse、Maria F. Céspedes Dávila、Marco Castello、Amélia Messara、Bertrand Vivet、Gilbert Marciniak、Armen Panossian、Gilles Hanquet、Frédéric R. Leroux
DOI:10.1016/j.tet.2019.04.037
日期:2019.6
scarcely described yet. We recently developed a new strategy, based on the use of an enantiopure difluoromethyl sulfoxide used as chiral and traceless auxiliary, for the synthesis of highly enantioenriched α-difluoromethyl alcohols. The first method developed in our laboratory aims to access highly stereoenriched α,α-difluoro-β-hydroxysulfoxides through the condensation of the enantiopure difluoromethyl
Aryl Fluoroalkyl Sulfoxides: Optical Stability and p
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K
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Measurement
作者:Amélia Messara、Nicolas Vanthuyne、Patrick Diter、Mourad Elhabiri、Armen Panossian、Gilles Hanquet、Emmanuel Magnier、Frédéric R. Leroux
DOI:10.1002/ejoc.202100816
日期:2021.9.24
properties of chiral aryl fluoroalkyl sulfoxides with strong synthetic potential were studied. After resolution by enantioselective chromatography, their optical stability was investigated by thermal enantiomerization via enantioselective chromatography. Their ΔG values range from 38.2 to 41.0 kcal mol−1 at 214 °C. In addition, the pKa values of six aryl difluoromethyl sulfoxides were determined via
研究了具有强大合成潜力的手性芳基氟代烷基亚砜的关键性质。通过对映选择性色谱拆分后,通过对映选择性色谱的热对映异构化来研究它们的光学稳定性。它们的 Δ G值在 214 °C 时为 38.2 至 41.0 kcal mol -1。此外,六种芳基二氟甲基亚砜的 p K a值是通过 DMSO 中的间接紫外-可见分光光度滴定法测定的,其范围为 20.3-22.5。
Facile synthesis of α,α-difluoroalkyl aryl thioethers and their oxidative desulfurization–fluorination to trifluorides
作者:Verena Hugenberg、Günter Haufe
DOI:10.1016/j.jfluchem.2010.06.010
日期:2010.9
treatment of the formed fluorinated thioethers with the same reagents at elevated temperature gave alkyl trifluoroacetates in almost quantitative yield under optimised conditions by oxidativedesulfurization–fluorination.
through a sulfonium–Claisen-type rearrangement. This reaction enables the incorporation of two valuable functional groups, such as the cyanomethyl group and the fluoroalkylthio group, into arenes. Remarkably, fluoroalkylthio groups, such as SCFH2 and SCF2H, bearing active hydrogen, are well tolerated by the reaction. The success of the reaction relies on the use of an excess amount of acetonitrile
Access towards enantiopure α,α-difluoromethyl alcohols by means of sulfoxides as traceless chiral auxiliaries
作者:Chloé Batisse、Armen Panossian、Gilles Hanquet、Frédéric R. Leroux
DOI:10.1039/c8cc05571h
日期:——
A new methodology has been developed to access highly enantioenriched α,α-difluoromethyl alcohols by means of sulfoxides as traceless and chiral auxiliaries.