High-Throughput Synthesis of <i>N</i>3-Acylated Dihydropyrimidines Combining Microwave-Assisted Synthesis and Scavenging Techniques
作者:Doris Dallinger、Nikolay Yu. Gorobets、C. Oliver Kappe
DOI:10.1021/ol034085v
日期:2003.4.1
The solution-phase synthesis of N3-acylated dihydropyrimidines was achieved utilizing microwave flash heating both in the synthesis (acylation) and purification (scavenging) steps. Quenching times for excess anhydrides using polystyrene or silica-supported diamine sequestration reagents were reduced from several hours to minutes utilizing microwave irradiation. The use of water as sequestration agent, coupled with an efficient solid-phase extraction workup technique allowed the rapid generation of a 20-member library of N3-acylated dihydropyrimidines.
A Cs2CO3-mediated simple and selective method for the alkylation and acylation of 3,4-dihydropyrimidin-2(1H)-thiones
作者:Salil Putatunda、Arijit Chakraborty
DOI:10.1016/j.crci.2013.12.006
日期:2014.10
excellent yields in the presence of Cs2CO3, a mild base. The method evidences a selective S-alkylation when using acyl chlorides as efficient acylating agents at room temperature on the 2-thioxo-dihydropyrimidone moiety. A possible mechanistic interpretation of the different selectivities in case of alkylation and acylation was done with the help of a geometry optimization process.
A Domino Desulfitative Coupling/Acylation/Hydration Process Cocatalyzed by Copper(I) and Palladium(II): Synthesis of Highly Substituted and Functionalized Pyrimidines
作者:Zheng-Jun Quan、Wang-Hua Hu、Xiao-Dong Jia、Zhang Zhang、Yu-Xia Da、Xi-Cun Wang
DOI:10.1002/adsc.201200402
日期:2012.11.12
A domino desulfitative coupling/acylation/hydration process to synthesize C-2-(2-oxo-2-phenylethylidene)- and N-3-carbonyl-substituted pyrimidines by unprecedented CC and CN cross-coupling reactions is described. This methodology couples 3,4-dihydropyrimidine-2-thiones and alkynes under modified Liebeskind–Srogl conditions using palladium acetate and copper(I) carboxylate. Remarkably the copper(I)