A Remarkable Rate Acceleration of the One-Pot Three-Component Cyclocondensation Reaction at Room Temperature: An Expedient Synthesis of Mitotic Kinesin Eg5 Inhibitor Monastrol
A general and practical route for the synthesis of 3,4-dihydropyrimidin-2(1H)-ones by a one-pot condensation of aldehydes, β-ketoesters, and urea is described using trimethylsilyltriflate (1 mol%)-mediated cyclocondensation reaction at room temperature within 15 minutes. Yields are significantly higher than utilizing classical Biginelli reaction conditions. Synthesis of mitotic Kinesin Eg5 inhibitor monastrol has been achieved in 95% isolated yield.
Green Chemistry Approaches to the Synthesis of 5-Alkoxycarbonyl-4-aryl-3,4- dihydropyrimidin-2(1<i>H</i>)-ones by a Three-Component Coupling of One-Pot Condensation Reaction: Comparison of Ethanol, Water, and Solvent-free Conditions
A general and practical green chemistry route to the Biginelli cyclocondensation reaction using cerium(III) chloride as the catalyst (25% mol) is described under three different sets of reaction conditions. This method provides an efficient and much improved modification of original Biginelli reaction reported in 1893, in terms of high yields, short reaction times, and simple work-up procedure, and
An efficient and high yielding protocol for the synthesis of substituted dihydropyrimidin-2(1<i>h</i>)-ones and spiro-fused heterocycles by involving tandem reactions
作者:D Subhas Bose、MohD. Idrees
DOI:10.1002/jhet.5570440133
日期:2007.1
A simple and efficient method has been developed for the synthesis of 3,4-dihydropyrimidin-2(1H)-ones by a one-pot three component cyclocondensation reaction of alkyl acetoacetates, aldehyde, and urea in the presence of a catalytic amount of the reusable catalyst zinc per chlorate hexahydrate, Zn(ClO4)2.6H2O (10 mol %) the scope of this protocol is utilized for the synthesis of mitotic Kinesin EG5
An efficient catalytic synthesis of 4-aryl-3,4-dihydropyrimidine-2(1H)-onederivatives using copper (II), iron (III) and zinc (II) exchanged montmorillonite clays as a catalyst is described. The desired products were obtained in good yields.