Magnetic nanoparticle supported amine: An efficient and environmental benign catalyst for versatile Knoevenagel condensation under ultrasound irradiation
作者:Anguo Ying、Limin Wang、Fangli Qiu、Huanan Hu、Jianguo Yang
DOI:10.1016/j.crci.2014.05.012
日期:2015.2
Résumé Amine functionalized silica coated Fe3O4 nanoparticles (SiO2@MNP-A) were successfully prepared as a novel heterogeneous amine. The catalyst was characterized by XRD, FT-IR, TEM, magnetic measurement, elemental analysis and was found to be a magnetically separable and highly active catalyst for ambient Knoevenagel condensation of aromatic aldehydes and α-aromatic (heteroaromatic or polyaromatic)-substituted methylene compounds in water under ultrasonic irradiation to afford the corresponding products in good to excellent yields. Very interestingly, SiO2@MNP-A successfully catalyze the reaction of the non-cyano substituted compound with benzaldehyde to achieve a key intermediate for the preparation of Atorvastatin calcium in green and atom-economic manner. In addition, the catalyst SiO2@MNP-A can be reused for 8 times without any obvious loss of its activity. The role of ultrasonication in the Knoevenagel condensation was also discussed with the assistance of UV–vis spectrometry.
Cu-Catalyzed, electron-relayed three-component synthesis of 2-alkenylbenzothiazoles with cathodic ammonia evolution
作者:Chengxian Hu、Dan Wang、Lu Wang、Ying Fu、Zhengyin Du
DOI:10.1039/d3gc03884j
日期:——
A CuI-catalyzed, one-pot, three-component reaction of benzaldehydes, 2-aminobenzothiol and malononitrile is described, wherein CuI plays an electron relay. The method features simplified operation, highly atom economy, and mild reaction conditions.
介绍了一种 CuI 催化的苯甲醛、2-氨基苯硫醇和丙二腈的一锅三组分反应,其中 CuI 起着电子中继的作用。该方法具有操作简单、原子经济性高和反应条件温和等特点。
Biological activity and computational analysis of novel acrylonitrile derived benzazoles as potent antiproliferative agents for pancreatic adenocarcinoma with antioxidative properties
anticancer properties of acrylonitriles, we present a study involving the design, synthesis, computationalanalysis, and biological assessment of novelacrylonitrilesderived from methoxy, hydroxy, and -substituted benzazole. Our aim was to examine how varying the number of methoxy and hydroxy groups, as well as the -substituents on the benzimidazole core, influences their biologicalactivity. The newly
Ghoneim, K. M.; El-Basil, S.; Osman, A. N., Revue Roumaine de Chimie, 1991, vol. 36, # 11-12, p. 1355 - 1362
作者:Ghoneim, K. M.、El-Basil, S.、Osman, A. N.、Said, M. M.、Megahed, S. A.
DOI:——
日期:——
10.1016/j.tet.2024.134051
作者:Jafari, Ali、Shahedi, Mansour、Habibi, Zohreh
DOI:10.1016/j.tet.2024.134051
日期:——
presents a one-pot synthesis method involving a Michael acceptor formation via condensation reaction between aldehyde and benzothiazole-2-acetonitrile catalyzed by bovine serum albumin (BSA), followed by a decarboxylative Michael addition reaction using keto esters as nucleophiles and immobilized lipase (Novozym435) as a catalyst. This approach enabled the synthesis of 11 derivatives of 2-(benzo[]thi