compounds containing at least one core moiety of pyrano[2,3-d]pyrimidine have received considerable attention in synthetic organic chemistry because of their potential as drugs and bioactive compounds. Pyrano[2,3-d]pyrimidines have attracted interest in medicine as antitumor, anti-hypertensive, antibacterial and antileishmanial drugs. Pyrano[2,3-d]pyrimidines have been produced by a number of methods. A
Synthesis, characterization and application of ZnFe<sub>2</sub>O<sub>4</sub>nanoparticles as a heterogeneous ditopic catalyst for the synthesis of pyrano[2,3-d] pyrimidines
In the present work, ZnFe2O4nanopowder, as a highly efficient and heterogeneous catalyst, was prepared and fully characterized by IR, UV, XRD, EDX and SEM analysis.
Water Mediated Domino Knoevenagel-Michael-cyclocondensation Reaction of Malononitrile, Various Aldehydes and Barbituric Acid Derivatives Using Boric Acid Aqueous Solution System Compared with Nano-titania Sulfuric Acid
作者:Ardeshir Khazaei、Heidar Ali Alavi Nik、Ahmad Reza Moosavi-Zare
DOI:10.1002/jccs.201500115
日期:2015.8
Nano‐titania sulfuricacid (TSA) and boricacid [B(OH)3] were efficiently utilized for domino Knoevenagel‐Michael‐cyclocondensation reaction of malononitrile, variousaldehydes and barbituricacidderivatives to synthesis of pyrano[2,3‐d]pyrimidine diones. It is interesting that in boricacidaqueoussolutionsystem, H+ which abstracted from water by the interaction with B(OH)3, efficiently catalyzed
Abstract A green synthetic route to the facile one-pot multicomponentsynthesis of pyrano[2,3‐d]pyrimidines and pyrido[2,3‐d]pyrimidines have been developed using magnetized deionized water (MDW) as a green solvent under catalyst-free conditions. All reactions carried out in a short period of time and the products are obtained in high-to-excellent yields. The developed synthetic technique offers numerous
摘要 在无催化剂的情况下,使用磁化去离子水(MDW)作为绿色溶剂,已经开发出一条绿色的合成路线,可以轻松实现一锅多位合成吡喃并[2,3- d ]嘧啶和吡啶并[2,3- d ]嘧啶。情况。所有反应都在短时间内进行,并且以高至优异的产率获得了产物。与传统的合成方法相比,发达的合成技术具有许多优点,包括环保,清洁合成,简单,成本低,反应时间短,反应产率高以及后处理容易。此外,通过监测普通去离子水和MDW中反应混合物的吸收光谱的变化,通过分光光度法跟踪反应速率。 图形摘要
Nano-basic silica as an efficient catalyst for the multi-component preparation of pyrano[2,3-d]pyrimidine derivatives
Abstract A high-yield protocol is explored for the synthesis of pyrano[2,3-d]pyrimidines through the multi-component reaction of aromatic aldehydes, 1,3-Dimethylbarbituric acid, and malononitrile using nano-basic silica as an efficient catalyst. The method tolerates various electron-donating and electron-withdrawing groups on the aromatic ring. Nano-basic silica was characterized by field emission scanning