通过使用简单的湿法浸渍法,用氧化铌(Fe 3 O 4 @Nb 2 O 5)涂覆磁铁矿,从而制备了一种新型的可磁回收纳米催化剂。充分表征了Fe 3 O 4 @Nb 2 O 5纳米催化剂,并通过单锅三组分Biginelli反应对其催化活性进行了评估,目的是合成1,4-二氢嘧啶酮类化合物。多种药理特性。所开发的方案适用于各种脂族和芳族底物,并且以优异的产率获得了结构多样的产品。与铜和镍纳米催化剂相比,铁3 O 4 @Nb 2 O 5纳米催化剂在极低的催化剂负载量(0.1摩尔%)下表现出优异的催化活性。这种铌纳米催化剂可以很容易地用外部磁体从反应混合物中分离出来,并且可以重复使用几次而不会损失其催化活性。此外,尽管Biginelli反应是一个具有百年历史的反应,但其机理仍是一个有争议的主题,我们的研究为该反应机理提供了见识。
Highly Efficient and Magnetically Recoverable Niobium Nanocatalyst for the Multicomponent Biginelli Reaction
作者:Carolina G. S. Lima、Sandrina Silva、Ricardo H. Gonçalves、Edson R. Leite、Ricardo S. Schwab、Arlene G. Corrêa、Márcio W. Paixão
DOI:10.1002/cctc.201402689
日期:2014.12
and nickel nanocatalysts, the Fe3O4@Nb2O5 nanocatalyst demonstrated superior catalytic activity at a remarkably low catalyst loading (0.1 mol %). This niobiumnanocatalyst could be easily separated from the reaction mixture with an external magnet and was reused several times without any loss of its catalytic activity. Moreover, although the Biginellireaction is a century‐old reaction, its mechanism
通过使用简单的湿法浸渍法,用氧化铌(Fe 3 O 4 @Nb 2 O 5)涂覆磁铁矿,从而制备了一种新型的可磁回收纳米催化剂。充分表征了Fe 3 O 4 @Nb 2 O 5纳米催化剂,并通过单锅三组分Biginelli反应对其催化活性进行了评估,目的是合成1,4-二氢嘧啶酮类化合物。多种药理特性。所开发的方案适用于各种脂族和芳族底物,并且以优异的产率获得了结构多样的产品。与铜和镍纳米催化剂相比,铁3 O 4 @Nb 2 O 5纳米催化剂在极低的催化剂负载量(0.1摩尔%)下表现出优异的催化活性。这种铌纳米催化剂可以很容易地用外部磁体从反应混合物中分离出来,并且可以重复使用几次而不会损失其催化活性。此外,尽管Biginelli反应是一个具有百年历史的反应,但其机理仍是一个有争议的主题,我们的研究为该反应机理提供了见识。
Chemistry, anti-diabetic activity and structural analysis of substituted dihydropyrimidine analogues
作者:Keshab M. Bairagi、Nancy Safwat Younis、Promise Madu Emeka、Katharigatta N. Venugopala、Osama I. Alwassil、Hany Ezzat Khalil、Ekta Sangtani、Rajesh G. Gonnade、Viresh Mohanlall、Susanta K. Nayak
DOI:10.1016/j.molstruc.2020.129412
日期:2021.3
variation of substituents present on the phenyl ring and urea/thiourea group on pharmacophoric features. Further, the crystalstructure and supramolecular characteristics of two compounds 4c and 4f were analyzed through a single-crystal X-ray method and the Hirshfeld Surface Analysis, which shows hydrogen bonding through N-H···O and N-H···S interactions with the formation of ring motif in the crystal structure