One-pot Synthesis of 3,4-Dihydropyrimidin-2(1<i>H</i>)-ones Catalysed by Cupric Acetate under Solvent-free Conditions
作者:Chingrishon Kathing、Jims World Star Rani、Nongthombam Geetmani Singh、Shokip Tumtin、Ridaphun Nongrum、Rishanlang Nongkhlaw
DOI:10.1002/jccs.201400041
日期:2014.11
AbstractA solvent‐free synthesis of 3,4‐dihydropyrimidin‐2(1H)‐ones from aromatic aldehydes, β‐keto ester/acetyl acetone and urea catalysed by cupric acetate under thermal condition is reported as a simple and an efficient protocol. Compared with classical Biginelli reaction reported in 1893, this new method provides much improved modification in terms of yield and reaction time. The usage of milder catalyst, environmental friendly procedures and excellent yields within a very short time (5–15 min) are the advantages of the method in which the involvement of solvent‐free condition adds an edge to the method. Thus, the efficiency of the protocol enabled the rapid synthesis of 3,4‐dihydropyrimidin‐2(1H)‐one derivatives in a short duration.
Dihydropyrimidones based chloride ion chemosensor functional in aqueous solution under environmentally relevant conditions
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