An Efficacious Protocol for the Oxidation of 3,4-Dihydropyrimidin-2(1H)-ones using Pyridinium Chlorochromate as Catalyst
作者:Kamaljit Singh、Kawaljit Singh
DOI:10.1071/ch07432
日期:——
4-Unsubstituted as well as 4,6-aryl/alkyl-3,4-dihydropyrimidin-2(1H)-ones were oxidized under neutral conditions using pyridinium chlorochromate to obtain the corresponding pyrimidin-2(1H)-ones in a synthetically useful manner.
Substituent effects on the voltammetric studies of 2-oxo-1,2,3,4-tetrahydropyrimidines
作者:Hamid R. Memarian、Mahnaz Ranjbar、Hassan Sabzyan、Abolfazl Kiani
DOI:10.1016/j.crci.2012.09.009
日期:2012.11
nature and steric hindrance of the substituents, their positions and their orientations towards the heterocyclic ring, determine their effects on the oxidation peak potential. The electron detachment process in this study is also affected by the nature of solvent, which explains the extent of solvation of both neutral THPM and THPṀ + . Analysis of the computational results obtained at the DFT-B3LYP/6-31++G**
Substituent effect in photocatalytic oxidation of 2-oxo-1,2,3,4-tetrahydropyrimidines using TiO2 nanoparticles
作者:Hamid R. Memarain、Mahnaz Ranjbar
DOI:10.1016/j.molcata.2011.12.026
日期:2012.4
The semiconductor-sensitized oxidation of various 1-, 4- and 5-substituted 2-oxo-1,2,3,4-tetrahydropyrimidines was carried out in acetonitrile using TiO2 anatase nanoparticles. The aims of this study were to elucidate the effects of the nature of the substituents on the 1-, 4- and 5-positions of the heterocyclic ring, the type of the photocatalyst and the nature of solvent on the rate of reaction. The proposed electron-transfer mechanism is supported by the experimental results and also by the computational studies. (C) 2012 Elsevier B.V. All rights reserved.