3,4-Dihydropyrimidin-2(1 H )-one 及其衍生物具有重要意义,尤其是在制药工业中。关于上述化合物的意义,本文介绍了一种利用纳米纤维素/BF 3 /Fe 3 O 4合成 3,4-二氢嘧啶-2(1 H )-酮的有效方法。作为路易斯酸催化剂。所需产物通过芳香醛、乙酰乙酸乙酯和尿素之间的一锅三组分反应获得。该反应在乙醇中进行,乙醇是一种绿色、低成本且可商购的溶剂。反应时间短、效率高、室温反应条件、催化剂的可重复使用性和易于操作是该方法的许多优点。通过FT-IR、SEM、TEM、XRD、BET、XRF和TGA技术进行催化剂分析。所有产品均通过 FT-IR 和1 H NMR 光谱进行表征。此外,催化剂显示出非常好的回收率,并且在五个连续反应后没有观察到产率损失。 图形概要
New magnetic nanocomposites of ZrO<sub>2</sub>–Al<sub>2</sub>O<sub>3</sub>–Fe<sub>3</sub>O<sub>4</sub>as green solid acid catalysts in organic reactions
作者:Anqi Wang、Xiang Liu、Zhongxing Su、Huanwang Jing
DOI:10.1039/c3cy00572k
日期:——
A series of magnetic solid acid nano-catalysts were designed and prepared through a facile co-precipitate approach. The original nanocomposites ZrO2âAl2O3âFe3O4 were characterized by means of ICP-AES, BET, XRD, TEM, HRTEM, VSM, FT-IR, NH3-TPD and TG. Their catalytic behaviours were investigated via esterification, the synthesis of bis-indolylmethanes, Hantzsch reaction, Biginelli reaction and Pechmann reaction. In all of these organic reactions, the corresponding products were obtained in moderate to excellent yields. The optimal catalyst was ZAF-16/16, which retained catalytic activity after several recycles.
Calix[8]arene Sulfonic Acid Catalyzed Three-Component Reaction for Convenient Synthesis of 3,4-Dihydropyrimidin-2(1<i>H</i>)-ones/thiones under Ultrasonic Irradiation
for the famous Biginelli reaction. Underultrasonicirradiation, calix[8]arene sulfonic acid could efficiently catalyzed the three-componentreaction of aldehydes with ethyl acetoacetate and urea or thiourea in ethanol to afford the corresponding 3,4-dihydropyrimidin-2(1H)-ones/thiones in 46-93%. The advantages of this method are the easy isolated procedure, short reaction time and low cost of the
An efficient and simple protocol has been developed for the synthesis of 3,4-dihydropyrimidin-2-(1H)-ones by a one-pot three-component cyclocondensation reaction of an aromatic aldehyde, β-ketoester, and urea or thiourea under solvent-free conditions using triethylamine (Et3N) as catalyst for the Biginelli reaction.
Copper-doped mesoporous silica supported dual acidic ionic liquid as an efficient and cooperative reusability catalyst for Biginelli reaction
作者:Nan Yao、Ming Lu、Xiao Bing Liu、Jin Tan、Yu Lin Hu
DOI:10.1016/j.molliq.2018.04.121
日期:2018.7
A series of MCM-41 supported functionalized ionic liquids doped with copper species were prepared, characterized and evaluated as catalysts in the Biginelli reaction. Most of these supported ionic liquids perform well in the reaction, especially the multifunctional copper coordinated MCM-41 supported heterogeneous catalysts (0.5)IL-TiCl5@[email protected](15) and (0.5)IL-HSO4@[email protected](15)
[EN] POTENTIATORS OF BETA-LACTAM ANTIBIOTICS AND COMBINATION THERAPY<br/>[FR] POTENTIALISATEURS D'ANTIBIOTIQUES DE TYPE BÊTA-LACTAMES ET POLYTHÉRAPIE
申请人:UNIV NOTRE DAME DU LAC
公开号:WO2017106552A1
公开(公告)日:2017-06-22
Proteins of methicillin-resistant Staphylococcus aureus (MRSA), an antibiotic sensor/signal transducer, are phosphorylated on exposure to β-lactam antibiotics. This event is critical for the onset of the biochemical events that unleash induction of antibiotic resistance. The phosphorylation and the antibiotic-resistance phenotype can be abrogated in the presence of inhibitors described herein that restore susceptibility of the organism to β- lactam antibiotics. The invention thus provides compounds and methods for abrogating antibiotic resistance to β-lactam antibiotics and for treating infections causes by antibiotics prone to developing resistance by potentiating β-lactam antibiotics.