Graphite oxide mediated oxidative aromatization of 1,4-dihydropyridines into pyridine derivatives
摘要:
A new approach utilizing graphite oxide as an oxidizing agent is applied for the oxidative aromatization of 1,4-dihydropyridines. Graphite oxide efficiently aromatized Hantzsch 1,4-dihydropyridines into their corresponding pyridine derivatives in excellent yields. The reaction was carried out in toluene at 100 degrees C. (C) 2012 Elsevier Ltd. All rights reserved.
Nano-zirconia as an excellent nano support for immobilization of sulfonic acid: a new, efficient and highly recyclable heterogeneous solid acid nanocatalyst for multicomponent reactions
作者:Ali Amoozadeh、Salman Rahmani、Mehrnoosh Bitaraf、Fatemeh Bolghan Abadi、Elham Tabrizian
DOI:10.1039/c5nj02430g
日期:——
Nano-zirconia-supported sulfonic acid as a novel, highly efficient and recyclable heterogeneous nanocatalyst is reported for the synthesis of multicomponent reactions.
报告了一种新型的、高效的、可回收的纳米催化剂——纳米氧化锆支撑的磺酸,用于合成多组分反应。
Poly(vinylpyrrolidinium) perchlorate as a new and efficient catalyst for the promotion of the synthesis of polyhydroquinoline derivatives via Hantzsch condensation
poly(vinylpyrrolidinium) perchlorate [PVPH]ClO4} as a new modified polymeric catalyst in the absence of solvent is reported. The title catalyst is easily prepared and characterized using a variety of techniques including infrared spectra, X-ray diffraction, thermal gravimetric analysis, scanning electron microscopy, pH analysis, and Hammett acidity function. Some of the advantages of this novel synthetic method are:
One-pot multi-component synthesis of polyhydroquinolines at ambient temperature
作者:K.A. Undale、T.S. Shaikh、D.S. Gaikwad、D.M. Pore
DOI:10.1016/j.crci.2010.09.009
日期:2011.5
Résumé An efficient and eco-friendly one-pot synthesis of polyhydroquinolines at ambient temperature from the multi-component reaction of aldehyde, 1,3-diketone, β-keto ester and ammonium acetate in ethanol medium is described. The probable mechanism of transformation is suggested. The features of this procedure are mild reaction conditions, no need of external catalyst, good yields and the operational simplicity at ambient temperature.
Tetraethylammonium 2-(carbamoyl)benzoate as a bifunctional organocatalyst for one-pot synthesis of Hantzsch 1,4-dihydropyridine and polyhydroquinoline derivatives
作者:Mahsa Yarhosseini、Shahrzad Javanshir、Mohammad G. Dekamin、Mohammad Farhadnia
DOI:10.1007/s00706-016-1666-1
日期:2016.10
environment-friendly approach for the synthesis of biologically active Hantzsch1,4-dihydropyridine and polyhydroquinoline derivatives in the presence of tetraethylammonium 2-(carbamoyl)benzoate, as an effective bifunctional metal-free catalyst, has been developed via a one-pot multicomponent reaction of various aldehydes, ethyl acetoacetate or cyclic 1,3-dicarbonyl compounds, and ammonium acetate in EtOH
Introduction of a novel nanosized N-sulfonated Brönsted acidic catalyst for the promotion of the synthesis of polyhydroquinoline derivatives via Hantzsch condensation under solvent-free conditions
After the characterization of this reagent, it was efficiently used for the promotion of the one-potsynthesis of hexahydroquinolines via one-potfour-component condensation of aryl aldehydes, 1,3-cyclohexadione derivatives, β-ketoesters and ammonium acetate under solvent-free conditions. The procedure gave the products in excellent yields in short reaction times and good to high yields. Also this catalyst
在这项研究中,4,4'-(1-丁烷1,4-丁二)双(1-磺基-1,4-二氮杂双环[2.2.2]辛烷-1,4-二鎓)四氯化物(NS-C 4(DABCO-使用不同类型的方法,包括FT-IR,1 H NMR,13 C NMR,质量,XRD,TGA,SEM和AFM分析,制备并表征了作为新型纳米级N-磺酸的SO 3 H)2)·4Cl)。该试剂的特征后,将其有效地用于促进一锅合成hexahydroquinolines的经由在无溶剂条件下,一锅四组分缩合芳基醛,1,3-环己二酮衍生物,β-酮酸酯和乙酸铵。该程序在短的反应时间内以优异的产率获得了产物,并且从良好的产率到高的产率。同样,该催化剂可以重复使用几次而不会损失其催化活性。