Microwave-Assisted and Iodine-Catalyzed Synthesis of Dihydropyrimidin-2-thiones via Biginelli Reaction Under Solvent-Free Conditions
作者:Qingjian Liu、Ning Pan、Jiehua Xu、Wenwen Zhang、Fanpeng Kong
DOI:10.1080/00397911.2011.593289
日期:2013.1.1
Abstract Microwave-assistedsynthesis of 3,4-dihydropyrimidin-2-thiones via Biginelli reaction from aldehydes, acetoacetates, and thiourea in the presence of iodine undersolvent-freeconditions has been accomplished in good yields and purity without chromatographic separation. GRAPHICAL ABSTRACT
AbstractCompounds 1 and 2 were synthesised using multi-component one-pot condensation reaction between 2-hydroxynaphthaldehyde, urea/thiourea and ethyl/methyl acetoacetate, catalysed with Zn(ClO4)2·6H2O in methanol. Compounds 1 and 2 were purified and characterised using 1H and 13C NMR, mass and CHN analyses. Organic nanoparticles (ONPs) were developed from compounds 1 and 2 using reprecipitation technique