Introduction of an efficient DABCO-based bis-dicationic ionic salt catalyst for the synthesis of arylidenemalononitrile, pyran and polyhydroquinoline derivatives
Abstract —An affordable DABCO-based bis-dicationic ionic salt ([(DABCO)2C3H5OH]·2Cl) was utilized for the synthesis of arylidenemalononitrile, tetrahydrobenzo[b]pyran, pyrano[2,3-d]-pyrimidinone (thione), dihydropyrano[3,2-c]chromene, and polyhydroquinoline derivatives. The significant features of the presented method are ease of preparation and handling of the catalyst, high catalytic activity, short
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:
Preparation and characterization of Cu (II) supported on poly(8-hydroxyquinoline-<i>p</i>
-styrene sulphonate) and its application as catalyst for the synthesis of hexahydroquinolines
Cu (II) supported on poly(8‐hydroxyquinoline‐p‐styrenesulfonate) (Cu (II)@PHQSS) was prepared and fully characterized by the different techniques including fourier transform infrared spectroscopy (FT‐IR), 1H NMR, 13C NMR, thermal gravimetric analysis (TGA), differential thermal gravimetric (DTG), differential thermal analysis (DTA), scanning electron microscope (SEM) and energy dispersive X‐ray analysis
的Cu(II)负载在聚(8- hydroxyquinoline- p -styrenesulfonate)(铜(II)@PHQSS)溶液并充分表征由不同的技术,包括傅里叶变换红外光谱(FT-IR),1 H NMR,13 C ^ NMR,热重分析(TGA),差热重分析(DTG),差热分析(DTA),扫描电子显微镜(SEM)和能量色散X射线分析(EDS)。然后,将Cu(II)@PHQSS作为纳米结构催化剂用作合成六氢喹啉的催化剂。
Green and efficient synthesis of acridine-1,8-diones and hexahydroquinolines via a KH2PO4 catalyzed Hantzsch-type reaction in aqueous ethanol
作者:Shi-Jun Yü、Si Wu、Xin-Min Zhao、Cheng-Wei Lü
DOI:10.1007/s11164-016-2814-2
日期:2017.5
A simple, clean, and economical methodology for the synthesis of acridine-1,8-dione and hexahydroquinoline derivatives via Hantzsch-type condensation has been described. This study highlights the development of a new green pathway for the preparation of substituted 1,4-dihydropyridines derivatives. The mild, cheap, and nontoxic potassium dihydrogen phosphate (KH2PO4) is proved to be an efficient catalyst for the above multi-component reaction to get excellent yields. Widely available and mostly benign catalyst, eco-friendly solvent, and easy purification are among the several attractive features.
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。