Aryl vinylsulphones, when “reduced” under well defined experimental conditions, do not lead to cleavage products or to hydrodimers but to cyclodimers, namely trans bis-1,2-(aryl sulphonyl)-cyclobutanes.
Electrocatalytic reactions: anion radical cyclobutanation reactions and electrogenerated base reactions
作者:Greg A.N. Felton
DOI:10.1016/j.tetlet.2007.11.171
日期:2008.1
Intermolecular anionradical [2+2] cyclobutanation reactions have been observed between vinyl sulfones and vinyl/propenyl ketones. The products are novel and formed electrocatalytically, although yields are at best modest (11–45%). Competing mechanisms are discussed. Additionally, the electrochemical reduction of vinyl alkyl sulfones in acetonitrile leads to near quantitative formation of cyanomethylation
DELAUNAY, JACQUES;MABON, GILLES;ORLIAC, ARMELLE;SIMONET, JACQUES, TETRAHEDRON LETT., 31,(1990) N, C. 667-668
作者:DELAUNAY, JACQUES、MABON, GILLES、ORLIAC, ARMELLE、SIMONET, JACQUES
DOI:——
日期:——
Electrochemical Reduction of Activated Olefins in Deuterated Solvents. II. A Regioselective Deuteriation Catalytic Process from alpha,beta-Ethylenic Aryl Sulfones.
作者:Jacques Delaunay、Ahmed Ghanimi、Sophie Diederichs、Jacques Simonet、Inger Søtofte、George W. Francis、József Szúnyog、Bengt Långström
DOI:10.3891/acta.chem.scand.52-0165
日期:——
The title compounds were electrochemically reduced in aprotic dimethyl sulfoxide-d(6), acetonitrile-d(3), or organic solvents containing heavy water. When a catalytic amount of charge passed through the cell, alpha-deuteriation of olefins occurred in high yield. Since both chemical and electrochemically formed bases were found to be totally inefficient in the performance of such deuteriation, a radical chain process is tentatively proposed. During attempted total reduction of substrates, tetradeuteriated dimers were isolated, from which information on the reduction mode and coupling process can be obtained.
A cathodic mode of access to 1-arylsulfonylcyclobutenes
1,2 bis(arylsulfonyl)cyclobutanes issued from cathodic treatment of the corresponding arylvinylsulfones lead only by action of electrogenerated bases via a β — elimination reaction, to 1-arylsulfonylcyclobutenes in high yield.