catalyst for the synthesis of a series of pyranopyrazole derivatives via a one-pot, four-component reaction of carbonyl compound or isatin, hydrazine hydrate, malononitrile, and β-keto ester in EtOH–H2O. The catalyst was found to work extremely for aldehydes, ketones or isatins at room temperature to give the corresponding dihydropyrano[2,3-c]pyrazole or spiro[indoline-3,4′-pyrano[2,3-c]pyrazole] derivatives
证明葡甲胺是一种生物基化学物质,它是通过羰基化合物或靛红,水合肼,丙二腈和β的单锅四组分反应合成一系列吡喃并吡唑衍生物的高效且可重复使用的催化剂。酮的EtOH-H酯2 O.将催化剂在室温下发现极其对醛,酮或靛红工作以得到相应的二氢吡喃并[2,3- c ^ ]吡唑或螺[二氢吲哚-3,4'-吡喃并并[2,3- c ^ ]吡唑]衍生物以高产率。这个新方法的显着特点是广泛的底物范围,室温下的反应条件,反应时间短,产量高,容易进行后处理过程中,催化剂的可重用性,并且不存在有害的有机溶剂。
An Efficient Multi-component Synthesis of 6-Amino-3-methyl-4-Aryl-2,4- dihydropyrano[2,3-c]Pyrazole-5-carbonitriles
Pyrano[2,3-c]pyrazoles exhibit analgesic,14 anti-cancer,15 anti-microbial and anti-inflammatory16 activity. Furthermore dihydropyrano[2,3-c]pyrazoles show molluscidal activity17,18 and are used in a screening kit for Chk 1 kinase inhibitor activity.19,20 They also find applications as pharmaceutical ingredients and bio-degradable agrochemicals.21–29 Junek and Aigner30 first reported the synthesis of pyrano[2
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。