Epoxidation reaction of perfluoroalkenes with tert-amine N-oxide
摘要:
Straight-chain aliphatic tert-amine N-oxides were found to be useful oxidizing agent for epoxidation of tri- and tetra-substituted perfluoroalkenes under mild conditions in high yields. The process for epoxidation by employing tri-n-butylamine N-oxide gave the best result in the reagent survey. (C) 2012 Ren Ming Pan. Published by Elsevier B.V. on behalf of Chinese Chemical Society. All rights reserved.
aromatic amines, anilines and tertiaryamines with dimethyldioxirane (DMD) was examined. Treatment of heterocyclic aromatic amines and anilines with a slight excess of DMD at 0 °C afforded the corresponding N-oxides in quantitative conversion yields. In addition, the oxidation was chemoselective in the presence of carbon-carbon double bonds. On the other hand, most of the tertiaryamines assayed did
Two-Phase Oxidations with Aqueous Hydrogen Peroxide Catalyzed by Amphiphilic Pyridinium and Diazinium Salts
作者:Tomáš Hartman、Jiří Šturala、Radek Cibulka
DOI:10.1002/adsc.201500687
日期:2015.11.16
Amphiphilic pyridinium and diazinium salts were shown to be effective catalysts in two-phase (water/chloroform or water/dichloromethane) sulfoxidations and N-oxidations with hydrogenperoxide under mild conditions. This unprecedented oxidation method utilizes covalent bonding of hydrogenperoxide to a simple pyridinium or diazinium nucleus to increase the lipophilicity of the hydroperoxide species
An efficient metal-free aerobicoxidative C–N bond cleavage of tertiaryamines has been developed to construct N-heterocycles using molecular oxygen as the sole oxidant with high atom efficiency, in which all of the three alkyl groups in tertiaryamines can be utilized and transformed into N-heterocycles.