Silver-Catalyzed C(sp3)-H Sulfonylation for the Synthesis of Benzyl Sulfones Using Toluene Derivatives and α-Amino Acid Sulfonamides
作者:Kyalo Stephen Kanyiva、Kanako Uchida、Takanori Shibata
DOI:10.1246/bcsj.20200393
日期:2021.4.15
We describe a simple and practical protocol for the synthesis of benzyl sulfones using readily available toluene derivatives and α-aminoacid sulfonamides. The reaction proceeds to afford a broad range of benzyl sulfones in moderate to high yields under silver catalysis. The mechanism possibly involves a Minisci-type formation of α-aminoalkyl radical, homolytic cleavage of a N-S bond to generate a
Substrate- and temperature-controlled divergence in reactions of alcohols with TosMIC catalyzed by BF<sub>3</sub> · Et<sub>2</sub>O: Facile access to sulfinates and sulfones
ABSTRACT An efficient BF3 · Et2O-catalyzed divergent synthesis of sulfinate esters and sulfones through C–O and C–S bond formation has been achieved from alcohols and p-toluenesulfonylmethyl isocyanide (TosMIC). Various alcohols reacted smoothly with TosMIC under the present conditions at room temperature providing sulfinate esters exclusively. By tuning the reaction temperature, the alcohols that
A new protocol for the directsulfonylation of benzylic, allylic and homoallylic alcohols with sodiumarenesulfinates is described by using iron(III) chloride as a catalyst and chlorotrimethylsilane as an additive. This method requires no preactivation of alcohols. Surprisingly in the reaction with homoallyl alcohols nucleophilic addition of sulfinate anion, occurs at the terminal double bond instead