An Efficient Synthesis of Multi-Substituted 3,4-Dihydropyrimidin-2(1H)-ones/thiones Under Solvent-Free Microwave Irradiation Using Alumina Sulfuric Acid
A new and efficient method for the synthesis of multi-substituted dihydropyrimidinone derivatives or their sulfur analogs has been developed undersolvent-freemicrowaveirradiation conditions in the presence of alumina sulfuric acid (Al2O3-SO3H) as an environmentally friendly heterogeneous recyclablecatalyst, in high yields and short reaction time.
A Remarkable Rate Acceleration of the One-Pot Three-Component Cyclocondensation Reaction at Room Temperature: An Expedient Synthesis of Mitotic Kinesin Eg5 Inhibitor Monastrol
A general and practical route for the synthesis of 3,4-dihydropyrimidin-2(1H)-ones by a one-pot condensation of aldehydes, β-ketoesters, and urea is described using trimethylsilyltriflate (1 mol%)-mediated cyclocondensation reaction at room temperature within 15 minutes. Yields are significantly higher than utilizing classical Biginelli reaction conditions. Synthesis of mitotic Kinesin Eg5 inhibitor monastrol has been achieved in 95% isolated yield.
Green Chemistry Approaches to the Synthesis of 5-Alkoxycarbonyl-4-aryl-3,4- dihydropyrimidin-2(1<i>H</i>)-ones by a Three-Component Coupling of One-Pot Condensation Reaction: Comparison of Ethanol, Water, and Solvent-free Conditions
A general and practical green chemistry route to the Biginelli cyclocondensation reaction using cerium(III) chloride as the catalyst (25% mol) is described under three different sets of reaction conditions. This method provides an efficient and much improved modification of original Biginelli reaction reported in 1893, in terms of high yields, short reaction times, and simple work-up procedure, and
Titanium dioxide supported on MWCNTs as an eco-friendly catalyst in the synthesis of 3,4-dihydropyrimidin-2-(1H)-ones accelerated under microwave irradiation
作者:Javad Safari、Soheila Gandomi-Ravandi
DOI:10.1039/c3nj01618h
日期:——
Some transition metal oxides supported on MWCNTs were prepared as novel heterogeneouscatalysts using the facile processes. Then, the catalytic behaviour of transition metal oxide–MWCNT nanocomposites was investigated in the Biginellione-pot cyclocondensation of aldehydes, β-dicarbonyl compounds and urea (thiourea) in solvent-free media under microwave irradiation as the energy source. The experimental
22% Co/CeO2-ZrO2-catalyzed Synthesis of 1, 2, 3, 4-tetrahydro-2- pyrimidinones and -thiones
作者:Hajar Biklarian、Farahnaz K. Behbahani、Zahra Fakhroueian
DOI:10.2174/157017812802850159
日期:2012.9.1
Three-component condensation reaction of an aldehyde with β-ketoester and urea or thiourea in acetonitrile to
afford the dihydropyrimidinones and thions (DHPMs) in the presence of 22% Co/CeO2-ZrO2 nano fine particle as a novel,
reusable and green catalyst is reported. Utilizing of 22% Co/CeO2-ZrO2 nano fine particle catalyst also offers a cleaner
process in that it can be reused and will not bring additional pollutants into the “environment” that is agreeable green
chemistry point of view.