Oxidation of Biginelli Reaction Products: Synthesis of 2-Unsubstituted 1,4-Dihydropyrimidines, Pyrimidines, and 2-Hydroxypyrimidines
作者:Hyunik Shin、Sam Kim、Bo Choi、Jae Lee、Ki Lee、Tae Lee、Young Kim
DOI:10.1055/s-0028-1087920
日期:2009.3
from the Biginelli product, dihydropyrimidin-2(1H)-thiones in two steps: Oxidation of dihydropyrimidin-2(1H)-thiones using oxone on wet alumina or hydrogen peroxide in the presence of catalytic amount of vanadyl sulfate provided 1,4-di-hydropyrimidine, which was further oxidized to 2-unsubstituted pyrimidines by the treatment of KMnO 4 . Oxidation of dihydropyrimidin-2(1H)-ones by KMnO 4 formed 2-hydroxypyrimidine
Room temperature synthesis of 3,4-dihydropyrimidin-2(1<i>H</i>)-one using apatite like oxyphosphate
作者:S. Sumathi、G. Buvaneswari
DOI:10.1080/24701556.2017.1284088
日期:2017.7.3
An oxyphosphate of formula BiCa4(PO4)3O was prepared and characterized by powder XRD, Fourier transform infrared spectroscopy (FTIR), and SEM-EDAX techniques. The catalytic activity of the synthesized compound was explored in the preparation of 3,4-dihydropyrimidin-2(1H)-one using Biginelli reaction. Influence of parameters such as temperature and solvent on this reaction using this heterogeneous catalyst