Dowex-promoted general synthesis of N,N′-disubstituted-4-aryl-3,4-dihydropyrimidinones using a solvent-free Biginelli condensation protocol
作者:Kamaljit Singh、Divya Arora、Sukhdeep Singh
DOI:10.1016/j.tetlet.2006.04.061
日期:2006.6
Dowex-50W ion exchange resin-promoted solvent-free heating of an intimate mixture of an aldehyde, an active methylene compound and N,N'-dimethylurea furnished the title compounds in moderate to good yields. (c) 2006 Elsevier Ltd. All rights reserved.
The development of an ecofriendly procedure for alkaline metal (II) sulfate promoted synthesis of<i>N</i>,<i>N</i>â²-dimethyl substituted (unsubstituted)-4-aryl-3,4-dihydropyrimidones (thiones) and corresponding bis-analogues in aqueous medium: Evaluation by green chemistry metrics
作者:Chhanda Mukhopadhyay、Arup Datta
DOI:10.1002/jhet.283
日期:——
Different alkalinemetal (II) sulfates were used as catalysts for the N,N′-dimethylsubstituted as well as unsubstituted 4-aryl-3,4-dihydropyrimidones (thiones) and their correspondingbis-analogues in aqueousmedium. Among the various salts, MgSO4·7H2O (Epsom salt) proved to be the best catalyst giving the desired products in good to excellent yields. This catalyst enables the construction of a series