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
Cobalt modified N-doped carbon nanotubes for catalytic CC bond formation <i>via</i> dehydrogenative coupling of benzyl alcohols and DMSO
作者:Jinlei Li、Guoliang Liu、Lijun Shi、Qi Xing、Fuwei Li
DOI:10.1039/c7gc02335a
日期:——
The development of heterogeneous, cost-effective and environmentally benign catalysts to construct CC bonds is highly desirable.
开发多元化、具有成本效益且环境友好的催化剂来构建C-C键是非常可取的。
A visible-light photocatalytic thiolation of aryl, heteroaryl and vinyl iodides
作者:M. L. Czyz、G. K. Weragoda、R. Monaghan、T. U. Connell、M. Brzozowski、A. D. Scully、J. Burton、D. W. Lupton、A. Polyzos
DOI:10.1039/c8ob00238j
日期:——
The general catalytic synthesis of aryl and vinyl thioethers from readily available halides remains a challenge. Herein we report a unified method for the thiolation of aryl and vinyl iodides with dialkyl disulfides using visible light photoredox catalysis. A range of thioether products bearing diverse functional groups can be accessed in high yield and with excellent chemoselectivity. We demonstrate
Desulfonylation of α-Methylthio-α,β-unsaturated Sulfones. A New Route to One Carbon Homologation of Aromatic Aldehydes
作者:Xian Huang、Han-Zhong Zhang
DOI:10.1055/s-1989-27143
日期:——
α-Methylthio-α,β-unsaturated sulfones 3 prepared from aromatic aldehydes 1 and sulfone 2 react with sodium hydrogen telluride in ethanol to undergo reductive desulfonylation to give vinyl sulfides 4 with certain extent of stereospecificity. A new route to one carbon homologation of aromatic aldehydes 1 to 5 is achieved by hydrolysis of 4 with titanium tetrachloride.
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.