A new nano-Fe<sub>3</sub>O<sub>4</sub>-supported organocatalyst based on 3,4-dihydroxypyridine: an efficient heterogeneous nanocatalyst for one-pot synthesis of pyrazolo[3,4-<i>b</i>]pyridines and pyrano[2,3-d]pyrimidines
作者:Mozhgan Pirhayati、Ali Kakanejadifard、Hojat Veisi
DOI:10.1002/aoc.3534
日期:2016.12
Meldrum's acid and 5‐methylpyrazol‐3‐amine under very mild reaction condition and in the presence of ethanol solvent. Moreover, the synthesized catalyst was used for one‐pot, three‐component condensation of aromatic aldehydes with barbituric acid and malononitrile to produce 7‐amino‐2,4‐dioxo‐5‐phenyl‐2,3,4,5‐tetrahydro‐1H‐pyrano[2,3‐d]pyrimidine‐6‐carbonitriles. All reactions are completed in short
已经开发了一种简单实用的策略,用于合成基于3,4-二羟基吡啶(Fe 3 O 4 / Py)的新型纳米Fe 3 O 4负载的有机催化剂体系。使用傅立叶变换红外光谱,透射和扫描电子显微镜,X射线衍射,振动样品磁力分析和能量色散X射线分析对制备的催化剂进行了表征。因此,Fe 3 O 4 / Py纳米颗粒表现出超顺磁性,饱和磁化强度为61 emug -1,表明其在磁分离技术中的潜在应用。我们的实验结果表明,吡啶官能化的Fe 3O 4纳米颗粒是一种非常有效的碱催化剂,可在非常温和的反应条件下,在乙醇溶剂的存在下,对各种芳族醛,Meldrum的酸和5-甲基吡唑-3-胺进行多米诺骨牌缩合。此外,合成的催化剂还用于芳香醛与巴比妥酸和丙二烯的一锅三组分缩合反应,生成7-氨基-2,4-二氧杂-5-5-苯基-2,3,4,5-四氢1 H-吡喃并[2,3 - d ]嘧啶-6-腈。所有反应均在短时间内完成,并且获得的