Asymmetric Sulfinylations of<i>N</i>-Methylephedrine-Modified Tri- or Tetraalkyl Zincates by Symmetric Diaryl Sulfoxides
作者:Simon Ruppenthal、Reinhard Brückner
DOI:10.1002/ejoc.201701603
日期:2018.6.7
Diethylzinc was treated with 1 or 2 equiv. of AlkMgCl or PhMgBr (preferably) or with 1 equiv. of nBuLi (less efficiently) for forming species – plausibly zincates – which were sulfinylated by diaryl sulfoxides to give racemic alkyl aryl sulfoxides in yields reaching 100 %. Dialkylzinc reagents were also activated by treatments with 1 or 2 equiv. of an enantiomericallypure alkylmagnesium β‐aminoalkoxide
Application of a novel 1,3-diol with a benzyl backbone as chiral ligand for asymmetric oxidation of sulfides to sulfoxides
作者:Paramartha Gogoi、Trimurthulu Kotipalli、Kiran Indukuri、Somasekhar Bondalapati、Pipas Saha、Anil K. Saikia
DOI:10.1016/j.tetlet.2012.03.077
日期:2012.5
A chiral 1,3-diol with a benzyl backbone has been used for the asymmetricoxidation of sulfides to sulfoxides. Moderate to good yields and enantioselectivity (upto 87% ee) have been observed.
Symmetric Diarylsulfoxides as Asymmetric Sulfinylating Reagents for Dialkylmagnesium Compounds
作者:Simon Ruppenthal、Reinhard Brückner
DOI:10.1021/jo502417j
日期:2015.1.16
dilithium salt of (S)-BINOL was added as a promotor. Alkyl aryl sulfoxides resulted in up to quantitative yield and with up to 97% ee. This demonstrates the feasibility of asymmetric sulfinylations by achiral sulfinylating agents (from the perspective of Alkyl2Mg) as well as the feasibility of asymmetricsulfoxide–magnesiumexchanges (from the perspective of Ar2SO).
Vanadium-Catalyzed Asymmetric Oxidation of Sulfides Using Schiff Base Ligands Derived from β-Amino Alcohols with Two Stereogenic Centers
作者:Yinuo Wu、Juntao Liu、Xingshu Li、Albert S. C. Chan
DOI:10.1002/ejoc.200900289
日期:2009.6
Novel Schiffbase ligands derived from β-amino alcohols with two stereogenic centers were prepared and used in the preparation of optically pure sulfoxides by usingaqueoushydrogenperoxide as the oxidant. A variety of sulfides were smoothly converted into the corresponding sulfoxides catalyzed by the chiral vanadium–Schiff base complex. Good yields (>80 %) with excellent enantioselectivities (>99 % ee)