提出了一种使用磁性固体酸催化剂制备二氢嘧啶基[4,5- b ]喹啉三酮衍生物的新型高效绿色方案。通过三步反应制备了高性能固体酸催化剂。首先,采用共沉淀法合成了CoFe 2 O 4纳米颗粒。在第二步骤中,通过用原硅酸四乙酯(CoFe 2 O 4 @SiO 2)处理,用SiO 2壳涂覆CoFe 2 O 4纳米颗粒。最后,用多磷酸(CoFe)对CoFe 2 O 4 @SiO 2进行了改性。2 O 4 @SiO 2 / PPA)。使用FTIR,VSM,TEM,FESEM,EDX对绿色可重复使用的催化剂进行了详细表征,并用作合成二氢嘧啶基[4,5- b ]喹啉三酮衍生物的催化剂。在绿色,有效和温和的条件下,在超声辐射下进行反应,并以高至极好的收率获得了产物。该方法具有绿色环保的条件,反应时间短,产物收率高,而且易于操作。
Two novel types of nanocellulose-based catalyst, viz. nanofibrillated cellulosesulfuricacid (s-NFC) and nanobacterial cellulosesulfuricacid (s-BC), were prepared by a simple method and characterized by Fourier-transform infrared spectroscopy, transmission electron microscopy, field-emission scanning electron microscopy, energy-dispersive X-ray spectroscopy, X-ray diffraction anlaysis, and nitrogen
Synthesis of New Dihydropyrimido[4,5-b]quinolinetrione Derivatives Using a Four-Component Coupling Reaction
作者:A. Khalafi-Nezhad、F. Panahi
DOI:10.1055/s-0030-1258446
日期:2011.3
A convenient and one-pot method for the efficient synthesis of the novel 8,9-dihydro-8,8-dimethyl-5,10-diphenylpyrimido[4,5-b]quinoline-2,4,6(1H,3H,5H,7H,10H)-trione derivatives via a four-component condensation reaction of aldehydes, amines, dimedone, and barbituric acid in the presence of tungestophosphoric acid (H3PW12O40) as catalyst is described. This newapproach proceeded smoothly in good to
一种方便且一锅法的有效合成新型8,9-二氢-8,8-二甲基-5,10-二苯基嘧啶[4,5 - b ]喹啉-2,4,6(1 H,3描述了在作为催化剂的tungesto磷酸(H 3 PW 12 O 40)存在下,醛,胺,二甲酮和巴比妥酸通过四组分缩合反应生成的H,5 H,7 H,10 H)-三酮衍生物。该新方法顺利进行,收率良好,收率极高,通过简单的过滤即可将纯产物从反应混合物中分离出来。 多组分反应-嘧啶-二氢吡啶-巴比妥酸-二甲基酮