New Ytterbium Complex-catalyzed Multicomponent Reactions for Synthesis of Dihydropyrimidines: [4+2] Cycloaddition vs. Biginelli Type Reaction
作者:Jie Zhu、Mingjie Zhang、Bo Liu、Xiaojuan Li
DOI:10.1246/cl.2009.56
日期:2009.1.5
A new schiff base ytterbium complex was synthesized and used as catalyst for a three-component, one-potreactioninvolving 1,3-keto ester with urea or thiourea and aldehyde. The reactions resulted ...
4-Dihydropyrimidin-2(1H)-one derivatives were synthesized using layered α-zirconium sulfophenylphosphonate as a recyclableheterogeneouscatalyst. Several classes of reagents, such as functionalized aromatic and aliphatic aldehydes, β-dicarbonyl derivatives and 2-aminobenzimidazole, were used to synthesize different 3,4-dihydropyrimidin-2(1H)-one derivativesundersolventfree conditions.Graphical Abstract
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.
A series of 4-substituted 3,4-dihydropyrimidine-2-ones (DHPM) was synthesized, characterized by IR, 1H NMR, 13C NMR and HRMS spectra. The compounds were evaluated in vitro for their antiviral activity against a broad range of DNA and RNA viruses, along with assessment for potential cytotoxicity in diverse mammalian cell lines. Compound 4m, which possesses a long lipophilic side chain, was found to
合成了一系列的4-取代的3,4-二氢嘧啶-2-酮(DHPM),并通过IR,1 H NMR,13 C NMR和HRMS光谱进行了表征。在体外评估了这些化合物对各种DNA和RNA病毒的抗病毒活性,并评估了多种哺乳动物细胞系中潜在的细胞毒性。具有长亲脂性侧链的化合物4m被发现是一种有效且选择性的Punta Toro病毒抑制剂,该病毒是Bunyaviridae的成员。对于裂谷热病毒(另一种布尼亚病毒)而言,4m的活性可忽略不计。具有带有卤素取代基的C-4芳基部分的DHPM(4b,4c和4d)被发现在MT4细胞中具有细胞毒性。
Water-tolerant and Reusable Catalyst for the One-pot Synthesis of Dihydropyrimidin-2(1H)-ones under Solvent-free Conditions