Anodic Oxidation of (Trimethylsilyl)methanes with π-Electron Substituents in the Presence of Nucleophiles
作者:Toshio Koizumi、Toshio Fuchigami、Tsutomu Nonaka
DOI:10.1246/bcsj.62.219
日期:1989.1
It was found that oxidation potentials of methanes with π-electron substituents were decreased by introduction of a trimethylsilyl group. The anodicoxidation of benzyl-, allyl-, aryl(or alkyl)thiomethyl-, and aryloxymethyl-substituted trimethylsilanes smoothly proceeded in the presence of nucleophiles, e.g. alcohols and carboxylic acids, to eliminate the trimethylsilyl groups giving the corresponding
Pummerer Reaction of Sulfoxides in Acetic Anhydride Catalyzed by Al-MCM-41
作者:Suguru Ito、Yoshihiro Kubota、Masatoshi Asami
DOI:10.1246/cl.150896
日期:2016.1.5
The Pummerer reaction of acetic anhydride with both alkyl aryl sulfoxides and dialkyl sulfoxides was efficiently promoted by a mesoporous aluminosilicate Al-MCM-41 to afford the corresponding α-ace...
The Pummerer rearrangement of phenyl methyl sulphonium bis(methoxycarbonyl)-methylide
作者:T. Yagihara、S. Oae
DOI:10.1016/0040-4020(72)80112-1
日期:1972.1
The reaction between phenyl methyl sulphonium bis(methoxycarbonyl)methylide and either aceticanhydride or benzoyl peroxide proceeds via “Pummerer” type rearrangement to afford phenyl α-acyloxymethyl sulphide. The kinetic data suggest that the rate-determining step involves SC bond cleavage after initial acylation or acyloxylation and subsequent proton removal by acyloxy anion unlike the corresponding
The displacement of a phenylthio group by an acetate ion in some allylic or α-alcoxy sulfides and thioacetals was cleanly performed by treating them with a mixture of copper powder and cupricacetate in aceticacid.
Decarboxylative Acetoxylation of Aliphatic Carboxylic Acids
作者:Sameera Senaweera、Kaitie C. Cartwright、Jon A. Tunge
DOI:10.1021/acs.joc.9b02092
日期:2019.10.4
with regioselectivity. An alternative approach is to use ubiquitous carboxylic acids as starting materials and perform a decarboxylative coupling. Herein, we report conditions for a photocatalytic decarboxylative C-O bond formation reaction that provides rapid and facile access to the corresponding acetoxylated products. Mechanistic investigations suggest that the reaction operates via oxidation of the