A New Biginelli Reaction Procedure Using Potassium Hydrogen Sulfate as the Promoter for an Efficient Synthesis of 3,4-Dihydropyrimidin-2(1<i>H</i>)-one
conditions have been found to carry out the Biginellireaction for the synthesis of 3,4-dihydropyrimidin-2(1H)-one derivatives. This synthesis was performed usingpotassiumhydrogensulfate as the promoter in glycol solution. Compared with the classical Biginellireaction conditions, this new method has the advantage of excellent yields (85-99%) and short reaction time (0.5-2 h).
environmentally friendly reaction conditions. Keywords: Dihydropyrimidinone, Dihydropyrimidinthione, Cobalt(II)Nitrate, Solvent-free, One-potsynthesis INTRODUCTION Synthesis of 3,4-dihydropyrimidine-2(1H)-Ones (DHPMs) through one-pot reaction of aromatic aldehyde, urea and ethyl acetoacetate in acid ethanol solution was initiated by Biginelli in 1893 1 . These compounds occupied an important place in medicinal
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
Silica-supported tin chloride and titaniumtetrachloride were prepared by the reaction of tin chloride and titaniumtetrachloride with activated silica gel in refluxing toluene. These solid acids have been employed as the catalysts for the synthesis of bis-dihydropyrimidin-2(1H)-ones from aromatic dialdehydes, 1,3-dicarbonyl compounds and urea at 90 °C under solvent-free conditions.