Application of Yttrium Iron Garnet as a Powerful and Recyclable Nanocatalyst for One-Pot Synthesis of Pyrano[2,3-c]pyrazole Derivatives under Solvent-Free Conditions
作者:E. Sedighinia、R. Badri、A. R. Kiasat
DOI:10.1134/s1070428019110186
日期:2019.11
The application of yttrium iron garnet (YIG) superparamagnetic nanoparticles as a new recyclable and highly efficient heterogeneous magnetic catalyst for one-pot synthesis of pyrano[2,3-c]pyrazole derivatives under solvent-free conditions, as well as etherification and esterification reactions are described. The advantages of the proposed method include the lack of organic solvents, clean reaction
钇铁石榴石(YIG)超顺磁性纳米粒子作为新型可回收高效异质磁性催化剂在无溶剂条件下一锅合成吡喃并[2,3- c ]吡唑衍生物以及醚化和酯化反应的应用描述。所提出的方法的优点包括缺少有机溶剂,清洁的反应,催化剂的快速去除,短的反应时间,优异的产率和催化剂的可回收性。
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
An Eco‐friendly Catalytic System for One‐pot Multicomponent Synthesis of Diverse and Densely Functionalized Pyranopyrazole and Benzochromene Derivatives
作者:U. P. Patil、Rupesh C. Patil、Suresh S. Patil
DOI:10.1002/jhet.3564
日期:2019.7
An external base‐free, efficient, cost‐effective, and environmentally benign protocol has been developed for the one‐pot multicomponentsynthesis of highly functionalized pyranopyrazoles and benzochromenes using water extract of Agave americana (century plant) leaf ash, a waste‐derived catalyst, at roomtemperature. Mild reaction conditions, high yield, easy isolation of products, eco‐friendly standards
Rapid One-pot, Four Component Synthesis of Pyranopyrazoles Using Heteropolyacid Under Solvent-free Condition
作者:Hemant V. Chavan、Santosh B. Babar、Rahul U. Hoval、Babasaheb P. Bandgar
DOI:10.5012/bkcs.2011.32.11.3963
日期:2011.11.20
A series of pyranopyrazoles, was efficiently synthesized via one-pot, four component reaction of ethyl acetoacetate, hydrazine hydrate, aldehydes and malononitrile in the presence of catalytic amount silicotungstic acid under solvent free condition. NOE experiments confirmed that the product exist exclusively in the 2H form. The present protocol offers the advantages of clean reaction, short reaction time, high yield, easy purification and economic availability of the catalyst.
Synthesis of Substituted Pyranopyrazoles under Neat Conditions via a Multicomponent Reaction
作者:Boreddy Reddy、Arasampattu Nagarajan
DOI:10.1055/s-0029-1217526
日期:2009.7
A simple and efficient synthesis of pyranopyrazoles in good yields via a four-component reaction between an aromatic aldehyde, hydrazine hydrate, ethyl acetoacetate and malononitrile under neat conditions is described.