Yttria-Zirconia–Based Lewis Acid Catalysis of the Biginelli Reaction: An Efficient One-Pot Synthesis of 3,4-Dihydropyrimidin-2-(1<i>H</i>)-ones
作者:S. Ramalingam、Pradeep Kumar
DOI:10.1080/00397910802519174
日期:2009.3.10
Abstract Yttria-zirconia–based Lewis acid efficiently catalyzes the three-component cyclocondensation reaction of aldehyde, β-keto ester, and urea or thiourea in refluxing acetonitrile to produce the corresponding dihydropyrimidones in high yields.
作者:Sadia Noreen、Saima Perveen、Muhammad Naeem Khan、Areesha Nazeer、Misbahul Ain Khan、Munawar Ali Munawar、Rabia Babar、Farah Suhail、Muhammad Azad、Alice M.R. Bernardino、Maurício S. Dos Santos
DOI:10.14233/ajchem.2013.14094
日期:——
Mono and dicarboxylic acids were found to be excellent catalysts for the synthesis of dihydropyrimidones/thiones. These are presented as alternate and cheap catalysts for the multicomponent reactions.
El-Hamouly, Wageeh S.; El-Khamry, Abdel-Momen A.; Abbas, Eman M. H., Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 2006, vol. 45, # 9, p. 2091 - 2098
作者:El-Hamouly, Wageeh S.、El-Khamry, Abdel-Momen A.、Abbas, Eman M. H.
DOI:——
日期:——
Regioselective chlorination at C-6 methyl position of 3,4-dihydropyrimidin-2(1H)-ones using (dichloroiodo)benzene
作者:Nilesh P. Tale、Amol V. Shelke、Bhagyashree Y. Bhong、Nandkishor N. Karade
DOI:10.1007/s00706-012-0908-0
日期:2013.7
(dichloroiodo)benzene with 4-aryl-1,2,3,4-tetrahydro-6-methyl-2-oxopyrimidine-5-carboxylates and 5-acetyl-4-aryl-3,4-dihydro-6-methylpyrimidin-2(1H)-ones resulted in geminal dichlorination at the C-6 methyl position of 3,4-dihydropyrimidin-2(1H)-one. Graphical abstract
Copper (II) nanodots stabilized on Cassia fistula galactomannan: preparation and catalytic application towards fast solvent-free Biginelli reaction
作者:BAL DEV SINGH、Jyoti Pandey、Huda Khanam、Bhoopendra Tiwari、Tazeen Azaz、Ayushi Mishra、Preeti Kanchan
DOI:10.1039/d4ob00441h
日期:——
environmentally benign synthesis of 3,4-dihydropyrimidin-2(1H)-ones/thiones has been achieved with wide variety of aldehydes, β-dicarbonyl compounds and urea or thiourea indicating the good tolerance of the catalyst towards various functionalities. The presented work has several merits in terms of economy which include easy operation, complete avoidance of toxic organic solvents and expensive catalysts, simple work-up
使用生物聚合多糖半乳甘露聚糖开发了新的 Cu( II ) 纳米点。纳米催化剂Cu( II )NDs@CFG是通过决明半乳甘露聚糖和CuSO 4 ·5H 2 O在水介质中一步清洁且可持续的反应而开发的。通过FT-IR、FE-SEM、EDS、ICP-MS、HR-TEM、XPS、XRD、TGA和BET分析对催化剂Cu( II )NDs@CFG进行了良好的表征。这是利用多糖半乳甘露聚糖作为支撑模板在水中形成铜纳米点来制备铜纳米点的第一个例子。此外,铜纳米点可作为多组分 Biginelli 反应的潜在纳米催化剂。使用多种醛、β-二羰基化合物和脲或硫脲实现了 3,4-二氢嘧啶-2(1 H )-酮/硫酮的简单、一锅、高效且环境友好的合成,表明该化合物具有良好的耐受性各种功能的催化剂。该工作在经济方面具有多种优点,包括操作简便、完全避免有毒有机溶剂和昂贵的催化剂、后处理简单、反应时间短和产率优异。