performance in multicomponent reactions (MCRs) for the one-pot synthesis of biologically useful 3,4-dihydropyrimidin-2(1H)-ones and xanthene derivatives in high to excellent yields. The eco-friendly and economic advantages of the said catalyst include its good recoverability and reusability for several runs, low price, low toxicity, and facile accessibility, manufacture, and handling.
A New Type of Magnetically-Recoverable Heteropolyacid Nanocatalyst Supported on Zirconia-Encapsulated Fe3O4 Nanoparticles as a Stable and Strong Solid Acid for Multicomponent Reactions
nano-Fe3O4@ZrO2 support existed in the Keggin structure. The acidity of the catalyst was measured by the help of a potentiometric titration with n-butylamine. It was surprising that this very strong solid acid catalyst exhibited an excellent acid strength which was as a result of possessing a higher number of surface active sites compared to its homogeneous analogues. The catalyticactivity of the as-prepared
Synthesis and characterization of the immobilized polythiophene on magnetic carbon nanotube as a prominent catalyst for the synthesis of dihydropyrimidinone and octahydroquinazolinone derivatives
作者:Parisa Akbarzadeh、Nadiya Koukabi
DOI:10.1007/s11164-020-04234-4
日期:2020.11
the interesting features of this project. Graphic abstract An environmentallybenign nanocomposite was prepared using carbon nanotube as an inexpensive, nontoxic, and stable support in the preparation of CNT–Fe3O4–PTh, which was efficiently used as catalyst for the green synthesis of dihydropyrimidinone and octahydroquinazolinone derivatives through Biginelli reaction under solvent-free conditions.
摘要 在这项工作中,合成了固定在磁性碳纳米管上的聚噻吩(CNT–Fe 3 O 4 –PTh),并将其作为一种新型且可回收的催化体系引入。通过FT-IR,TGA,EDX,VSM,XRD,TEM和FE-SEM对制备的磁性多相纳米催化剂进行了表征。其次,CNT–Fe 3 O 4的催化效率-PTh是在无溶剂条件下通过芳族醛,脲/硫脲和β-二羰基化合物之间的Biginelli反应通过绿色合成多种二氢嘧啶酮和八氢喹唑啉酮进行评估的。将该催化剂磁性回收并循环五个循环,而没有明显的催化活性损失。简单的后处理,价格合理,反应时间短,反应条件温和,产品收率高是该项目的有趣特征。 图形摘要 在制备CNT–Fe 3 O 4 –PTh时,使用碳纳米管作为廉价,无毒且稳定的载体,制备了对环境无害的纳米复合材料,该碳纳米管在Biginelli反应下有效地用作绿色合成二氢嘧啶酮和八氢喹唑啉酮衍生物的催化剂无溶剂条件。
Zirconia Sulfuric Acid: An Efficient Heterogeneous Catalyst for the One-Pot Synthesis of 3,4-Dihydropyrimidinones Under Solvent-Free Conditions
作者:Maliheh M. Hosseini、Eskandar Kolvari、Nadiya Koukabi、Maryam Ziyaei、Mohammad Ali Zolfigol
DOI:10.1007/s10562-016-1723-8
日期:2016.6
this article, zirconia sulfuricacid (ZrSA) has been synthesized from the reaction of ZrO2 with chlorosulfonic acid. It was characterized by (FT-IR, XRD, TGA, SEM, EDS, BET, BJH, ICP and pH analysis). This catalyst was employed for the synthesis of 3,4-dihydropyrimidinones via cyclocondensation of β-ketoester, aromatic aldehydes and urea/thiourea under solvent-freeconditions. Main advantages of the
Nano-ZrO<sub>2</sub> sulfuric acid: a heterogeneous solid acid nano catalyst for Biginelli reaction under solvent free conditions
作者:Eskandar Kolvari、Nadiya Koukabi、Maliheh M. Hosseini、Mitra Vahidian、Elham Ghobadi
DOI:10.1039/c5ra19350h
日期:——
Nano-ZrO2 sulfuric acid [n-ZrO2–SO3H (n-ZrSA)] has been synthesized from the reaction of nano-ZrO2 with chlorosulfonic acid as sulfonating agent. This catalyst was characterized via FT-IR, XRD, TGA, FESEM, TEM, EDX, BET, BJH, ICP and pH analysis. We show that n-ZrSA catalyzed the Biginellireaction for the synthesis of 3,4-dihydropyrimidin-2(1H)one derivatives in high yields under solvent-free conditions