Catalyst-free green synthesis of dihydropyrano[2,3-c]pyrazole scaffolds assisted by ethylene glycol (E-G) as a reusable and biodegradable solvent medium
作者:Farzaneh Mohamadpour
DOI:10.1007/s12039-020-01775-4
日期:2020.12
green ethyleneglycol (E-G) can be recycled at least six times with no considerable reduction in activity making it greatly advantageous in addressing the industrial requirements and environmental worries. Graphic AbstractThe catalyst-free and environmentally friendly synthesis of dihydropyrano[2,3-c]pyrazole scaffolds are reported via ethyleneglycol (E-G) as a green, reusable and biodegradable promoting
摘要我们发现无催化剂,绿色和快速一锅四部分串联的二氢吡喃并[2,3-的准备策略Ç ]吡唑-生物显著支架-通过Knoevenagel反应,迈克尔环合基于绿色化学原则。当前实践的重点是在无害反应条件下的应用,无催化剂,操作简便,使用廉价的引发剂,通过分离纯产物易于过滤,从而避免了对柱色谱法的需求,无金属,优异的收率,节省了反应时间。但是,绿色乙二醇(EG)可以循环使用至少六次,而活性不会显着降低,这使其在满足工业要求和环境问题方面具有极大优势。 图形摘要的二氢吡喃的和环境友好的无催化剂的合成[2,3- c ^ ]吡唑支架报告通过乙二醇(EG),为绿色,可重复使用的和可生物降解促进媒体经由乙酰乙酸乙酯,水合肼/的串联的Knoevenagel -迈克尔反应环化缩合苯肼,芳香族/脂肪族醛和丙二腈提供了预期的产品,具有出色的收率和较短的反应时间,这可能解决了工业上的一些成本问题
Supported palladium oxide nanoparticles in Al-SBA-15 as an efficient and reusable catalyst for the synthesis of pyranopyrazole and benzylpyrazolyl coumarin derivatives via multicomponent reactions
作者:Majid M. Heravi、Reihaneh Malakooti、Kosar Kafshdarzadeh、Zahra Amiri、Vahideh Zadsirjan、Hassan Atashin
DOI:10.1007/s11164-021-04619-z
日期:2022.1
An eco-friendly method for diversity-oriented synthesis of substituted dihydropyrano[2,3-c]pyrazole and benzylpyrazolyl coumarin derivatives has been achieved via one-pot and multicomponent reaction in the presence of PdO/Al-SBA-15 as an efficient and recyclable catalyst in H2O/EtOH under reflux conditions. The significant merits of this method are wide scope, high yields of the desired products, short
在 PdO/Al-SBA-15 存在下,通过一锅多组分反应,实现了一种生态友好的方法,用于合成取代二氢吡喃并[2,3- c ]吡唑和苄基吡唑基香豆素衍生物,作为一种高效且回流条件下在 H 2 O/EtOH 中的可回收催化剂。该方法的显着优点是适用范围广、所需产物收率高、反应时间短和后处理程序简单。此外,这种纳米催化剂被简单地回收和重复使用五次,而催化活性和性能没有显着损失。 图形概要
Synthesis of pyranopyrazoles using isonicotinic acid as a dual and biological organocatalyst
In this study, a green, simple and efficient method for the preparation of 6-amino-4-(4-methoxyphenyl)-5-cyano-3-methyl-1-phenyl-1,4-dihydropyrano[2,3-c]pyrazoles by means of a one-pot four component condensation reaction of aryl aldehydes, ethyl acetoacetate, malononitrile and hydrazine hydrate is reported. The reaction utilizes isonicotinic acid as a dual and biological organocatalyst at 85 °C under solvent-free conditions.
Magnesium ferrichromate nanoparticles: an efficient and recyclable catalyst in the synthesis of pyrano[2,3-c]pyrazole derivatives
作者:Ishita Yellapurkar、Sonal Bhabal、M. M. V. Ramana、Kundan Jangam、Vaibhav Salve、Sunil Patange、Paresh More
DOI:10.1007/s11164-021-04435-5
日期:2021.7
The pyrano[2,3-c]pyrazole derivatives were synthesized in water/ethanol solvent system using MgFeCrO4 NPs heterogenous catalyst. A very short reaction time, maximum yield, easy method of separation of product and environmentally safer and milder reaction conditions are some of the advantages of our work along with the retention of catalytic activity up to five cycles. Graphic abstract Synthesis of chromene
Green and efficient synthesis of pyranopyrazoles using [bmim][OH<sup>−</sup>] as an ionic liquid catalyst in water under microwave irradiation and investigation of their antioxidant activity
作者:Roghayeh Sharifi Aliabadi、Nosrat O. Mahmoodi
DOI:10.1039/c6ra17594e
日期:——
simple with highyields, short reaction times and an efficient workup method. The antioxidant activity of the products was evaluated using a 2,2-azinobis(3-ethylbenzothiazoline-sulfonate) (ABTS) assay. The antioxidant activity of the synthesized products was compared with both vitamin E and ascorbic acid. The products showed a higher antioxidant activity using this method. Products 4o, 4n, 4a, 4e and