A facile approach for the synthesis of 3,4-dihydropyrimidin-2-(1H)-ones using a microwave promoted Biginelli protocol in ionic liquid
作者:ABHISHEK N DADHANIA、VAIBHAV K PATEL、DIPAK K RAVAL
DOI:10.1007/s12039-012-0278-5
日期:2012.7
recycled and reused in at least six subsequent reactions with consistent activity. Carboxy functionalized ionic liquid [cmmim][BF4] is shown to be an efficient and green catalyst for the onepotsynthesis of 3,4-dihydropyrimidin-2-(1H)-ones heterocycles under microwave irradiation. This methodology represents an easy access to Biginelli compounds with high yields and purity. The ionic liquid was recycled
Synthesis of Biginelli Compounds Using Cobalt Hydrogen Sulfate
作者:Hamid Reza Memarian、Mahnaz Ranjbar
DOI:10.1002/jccs.201190016
日期:2011.8
Efficient synthesis of various 2‐oxo(thioxo)‐1,2,3,4‐tetrahydropyrimidines containing acetyl, carboethoxy, carbomethoxy and carboxamide groups on 5‐position of the N1‐substituted and N1‐unsubstituted heterocyclic ring was achieved using cobalt hydrogen sulfate Co(HSO4)2 under thermal conditions. Good to high yield, shorter reaction times, easy work up and simple preparation of Co(HSO4)2 are the advantages
The Biginelli Condensation: A Novel and Efficient Regioselective Synthesis of Dihydropyrimidin-2(1<i>H</i>)-ones Using Lithium Bromide
作者:Partha P. Baruah、Sunil Gadhwal、Dipak Prajapati、Jagir S. Sandhu
DOI:10.1246/cl.2002.1038
日期:2002.10
Various substituted 3,4-dihydropyrimidin-2(1H)-ones were synthesised in one-pot reaction of aldehydes, β-ketoesters and urea using LiBr in tetrahydrofuran in excellent yields without any side reactions as observed by Biginelli and others.
ZnO Nanoparticles as an Efficient, Heterogeneous, Reusable, and Ecofriendly Catalyst for One-Pot, Three-Component Synthesis of 3,4-Dihydropyrimidin-2(1<i>H</i>)-(thio)one Derivatives in Water
Abstract An extremely efficient heterogeneous protocol is reported for the one-pot, three-component synthesis of a series of dihydropyrimidinones (DHPMs) in the presence of ZnO nanoparticles in water as a green solvent. The ZnO nanoparticles exhibited excellent catalytic activity and the proposed methodology is capable of providing the desired products in good yields (65–94%) within short reaction
Synthesis of novel 3,4-dihydropyrimidinones on water soluble solid support catalyzed by indium triflate
作者:P. Shanmugam、G. Annie、P. T. Perumal
DOI:10.1002/jhet.5570400521
日期:2003.9
Syntheses of several new 3,4-dihydropyrimidinones (DHPMs) on sodium sulfate solid support have been reported. The microwave enhanced rapid synthesis of the title compounds yielded a good percentage of the DHPMs. The catalytic activity of indium triflate enables to prepare a wide range of DHPMs. Syntheses of 2-hydroxyphenyl, 2-hydroxy-4-methoxyphenyl pendant groups on DHPMs scaffold are advantages of