p-tolylsulfones, easily prepared frombase-catalyzed condensation of aromatic aldehydes with a variety of p-tolylsulfones, were efficiently transformed to the corresponding (E)-β-substituted aromatic olefins in a stereoselective manner through Mg-promoted reduction. The reaction may be initiated through electron transfer from Mg metal to the vinyl sulfones to give the corresponding anionic species
Aldehyde to Ketone Homologation Enabled by Improved Access to Thioalkyl Phosphonium Salts
作者:Meghan Fragis、Jackson L. Deobald、Srinivas Dharavath、Jeffrey Scott、Jakob Magolan
DOI:10.1021/acs.orglett.1c01189
日期:2021.6.18
to competing redox chemistry with sulfoxides. Here we circumvent this problem to achieve a formal phosphine Pummerer reaction that offers thioalkyl phosphonium salts that, in turn, give rise to diverse vinyl sulfides via Wittig olefinations. Thirty vinyl sulfides are thus prepared from (alkylthioalkyl)triphenyl phosphonium salts and aldehydes. The hydrolysis of these vinyl sulfides offers an efficient
ELECTROLYTIC REDUCTION OF 1-METHYLSULFINYL-1-METYLTHIO-2-ARYLETHENES AT MERCURY AND PLATINUM ELECTRODES IN ACETONITRIL
作者:Akira Kunugi、Kyo Abe
DOI:10.1246/cl.1984.159
日期:1984.2.5
The electrolytic reduction of 1-methylsulfinyl-1-methylthio-2-arylethenes involves a cleavage of one carbon–sulfurbond, resulting in formation of E-1-methylthio-2-arylethenes in good yields, but not Z-isomers, in the presence of excess phenol as a proton donor.