Simple protic ionic liquid [Et3NH][HSO4] as a proficient catalyst for facile synthesis of biscoumarins
作者:Sandip K. Patil、Deepak V. Awale、Madagonda M. Vadiyar、Suryakant A. Patil、Sagar C. Bhise、Sanjay S. Kolekar
DOI:10.1007/s11164-017-2932-5
日期:2017.10
Abstract We have explored a number of protic ionicliquids (PILs) as a catalyst for the synthesis of biscoumarins by condensation of 4-hydroxycoumarin with an aromatic aldehyde. Methylimidazolium- and triethylammonium-based PILs were synthesized by simple neutralization reaction with protic acids. Triethylammoniumhydrogensulfate [Et3NH][HSO4] was found to be the best among the studied PILs concerning
A Convenient, Eco-friendly, and Efficient Method for Synthesis of 3,3'-Arylmethylene-bis-4-hydroxycoumarins "On-water"
作者:Arpita Das Gupta、Swati Samanta、Rina Mondal、Asok K. Mallik
DOI:10.5012/bkcs.2012.33.12.4239
日期:2012.12.20
various aldehydes (aromatic, heterocyclic, and α,β-unsaturated) 2 using different catalysts and media. Some of these methods require long reaction time, use of expensive catalysts and organic solvents and tedious work up. In four recent papers, the said condensation has been reported to be performed in water by employing molecular iodine, ruthenium(III) chloride hydrate or surfactants like TBAB or DDS
The magnetic nanostructured natural hydroxyapatite (HAP/Fe3O4 NPs): an efficient, green and recyclable nanocatalyst for the synthesis of biscoumarin derivatives under solvent-free conditions
The magnetic nanostructured natural hydroxyapatite (HAP/Fe3O4 NPs) as a novel magnetic nanocatalyst was synthesized and fully characterized. The excellent catalytic activity of HAP/Fe3O4 NPs was investigated in the synthesis of biscoumarin derivatives under mild, green and solvent-freeconditions. A series of aromatic (bearing different functional groups), heteroaromatic and aliphatic aldehydes have
摘要合成并充分表征了 磁性纳米结构天然羟基磷灰石(HAP / Fe 3 O 4 NPs)。HAP / Fe 3 O 4的优异催化活性在温和,绿色和无溶剂条件下合成双香豆素衍生物中研究了NP。一系列芳香族(具有不同的官能团),杂芳香族和脂肪族醛已被转化为双香豆素,具有良好的分离产率。本方法与绿色化学原理非常吻合的显着优点是:催化剂便宜,无毒,易于处理且可重复使用多达六次循环,纳米结构催化剂的磁分离,后处理简单,反应时间短,产品的高收率和使用无溶剂条件。 图形概要
BiVO4-NPs: an efficient nano-catalyst for the synthesis of biscoumarins, bis(indolyl)methanes and 3,4-dihydropyrimidin-2(1H)-ones (thiones) derivatives
作者:Farhad Shirini、Monireh Pourghasemi Lati
DOI:10.1007/s13738-016-0959-y
日期:2017.1
4-dihydropyrimidin-2(1H)-ones (thiones) derivatives. The structures of the products were characterized by IR, 1HNMR and 13C NMR spectroscopy and comparison with the authentic samples. Easy work-up procedure, excellent yields, short reaction times and reusability of the catalyst are some advantages of this work. In addition, in this article and for the first time, the preparation of 3,4-dihydropyrimidin-2(1H)-ones
BiVO 4 -NPs可用作促进双香豆素,双(吲哚基)甲烷和3,4-二氢嘧啶-2(1 H)-ones(thiones)衍生物合成的有效且可重复使用的纳米催化剂。产物的结构通过IR,1 H NMR和13 C NMR光谱表征,并与真实样品进行比较。简便的后处理程序,优异的收率,较短的反应时间和催化剂的可重复使用性是这项工作的一些优势。另外,在本文中并且首次报道了从醛的被保护的衍生物包括肟,半咔唑酮和1,1-二乙酸酯制备3,4-二氢嘧啶-2(1 H)-酮和-硫酮的报道。
Bis [hydrazinium (1+)] hexafluoridosilicate:(N2H5)2SiF6 novel hybrid crystal as an efficient, reusable and environmentally friendly heterogeneous catalyst for Knoevenagel condensation and synthesis of biscoumarin derivatives
作者:Fatima El hajri、Zakaria Benzekri、Sarra Sibous、Ali Ouasri、Said Boukhris、Amina Hassikou、Ali Rhandour、Abdelaziz Souizi
DOI:10.1016/j.molstruc.2021.129890
日期:2021.4
A simple, effective, green and non-toxic protocol was used for the Knoevenagelcondensation and the biscoumarin derivatives synthesis. It have demonstrated that the use of a new hybrid crystal as a heterogeneouscatalyst makes it possible to obtain several advantages such as: a short reaction time and exceptional catalytic activity. Furthermore, (N2H5)2SiF6 was examined for five successive cycles without
一种简单,有效,绿色且无毒的方案用于诺文雅格尔缩合反应和双香豆素衍生物的合成。已经证明,使用新的杂化晶体作为非均相催化剂能够获得一些优点,例如:反应时间短和优异的催化活性。此外,对(N 2 H 5)2 SiF 6进行了五个连续循环的检查,没有明显的催化活性损失。