一种新的,直接的方法,可通过使用1,4-二磺基-1,4-二氮杂双环[2.2.2]辛烷-1通过巴比妥酸及其硫代类似物与醛的反应来合成5-芳基巴比妥酸和硫代巴比妥酸,已经报道了作为有效催化剂的4-二硫酸氢二钠([DABCO](SO 3 H)2(HSO 4)2)。在该项目中,还通过在该试剂和1,4-二磺基-1,4-二氮杂双环[2.2]存在下,通过巴比妥酸或硫代巴比妥酸,丙二腈和醛的反应制备吡喃并[2,3- d ]-嘧啶二酮。 .2]辛烷-1,4-氯化铵([DABCO](SO 3 H)2(Cl)2)已被调查。使用IR,1 H NMR和13 C NMR光谱对产物的结构进行表征。本方法论提出了若干优点,例如易于制备和处理催化剂,高收率,简单和绿色的方法,低成本,短的反应时间,易于后处理和在水中作为绿色溶剂进行反应的预形成。
Verjuice as a green and bio-degradable solvent/catalyst for facile and eco-friendly synthesis of 5-arylmethylenepyrimidine-2,4,6-trione, pyrano[2,3-d]pyrimidinone and pyrimido[4,5-d]pyrimidinone derivatives
作者:Niloufar Safari、Farhad Shirini、Hassan Tajik
DOI:10.1007/s13738-018-1565-y
日期:2019.4
of the synthesis of 5-arylmethylenepyrimidine-2,4,6-triones, via Knovenagel condensation reaction between barbituric or thiobarbituric acid and aldehydes. Verjuice is also employed for the effective synthesis of pyrano[2,3-d]pyrimidinonederivatives via a three-component reaction of barbituric acid or its thio analogue, aldehydes and malononitrile. In the same way, pyrimido[4,5-d]pyrimidinone derivatives
Verjuice(未成熟的葡萄汁)是一种有机酸的天然混合物,可通过pH值和TGA分析鉴定,可通过Knovenagel缩合有效地用于促进5-芳基亚甲基嘧啶-2,4,6-三酮的合成。巴比妥酸或硫代巴比妥酸与醛之间的反应。Verjuice还用于通过巴比妥酸或其硫代类似物,醛和丙二腈的三组分反应有效合成吡喃并[2,3- d ]嘧啶酮衍生物。同样,嘧啶基[4,5- d]嘧啶酮衍生物可简单地通过巴比妥酸,醛与脲或硫脲在果汁中的反应来制备。这种绿色方法学具有显着的优势,包括操作简单,可接受的反应时间,易于后处理,高收率,避免在反应和后处理过程中使用任何昂贵的起始原料,挥发性和有害有机溶剂以及使用天然,低成本,可重复使用且可生物降解的催化剂。
Succinimidinium hydrogensulfate ([H-Suc]HSO4) as an efficient ionic liquid catalyst for the synthesis of 5-arylidenepyrimidine-2,4,6(1H,3H,5H)-trione and pyrano-pyrimidinones derivatives
this work, succinimidinium hydrogensulfate ([H-Suc]HSO4), a newly reported Brönsted acidic ionic liquids is used as an efficient, homogeneous and reusable catalyst for the synthesis of 5-arylidenepyrimidine-2,4,6(1H,3H,5H)-trione and pyrano[2,3-d]-pyrimidine dione derivatives. The products were formed in excellent yields over short reaction times and the catalyst can be reused several times without
ionic compound named 2,2′-bipyridinium dihydrogen phosphate was synthesized by addition of phosphoric acid to a solution of 2,2′-Bipyridine in dichloromethane. After the characterization using FT-IR, mass, 1H, 13C and 31P NMR techniques, it was used as a Bronsted dicationic acidic catalyst for the promotion of the synthesis of 2-arylidene malononitrile and 5-arylidene barbituric acidderivatives via
通过将磷酸添加到2,2'-联吡啶在二氯甲烷中的溶液中,合成了名为2,2'-联吡啶二磷酸二氢的基于2,2'-联吡啶的离子化合物。在使用FT-IR,质谱,1 H,13 C和31 P NMR技术进行表征后,将其用作布朗斯台克双阳离子酸性催化剂,以促进通过Knoevenagel合成2芳基丙二腈和5芳基巴比妥酸衍生物。在水中发生缩合反应。该方法的一些优点是在高反应速率和产率下利用容易制备的,成本有效的和生态友好的有机盐作为催化剂,简单和快速的后处理以及可接受的催化剂可重复使用性。
Bi-SO3H functionalized ionic liquid based on DABCO as a mild and efficient catalyst for the synthesis of 1,8-dioxo-octahydro-xanthene and 5-arylmethylene-pyrimidine-2,4,6-trione derivatives
1,8-Dioxo-octahydro-xanthenes are easily prepared via the condensation of aldehydes with 1,3-cyclohexadione and/or dimedone using N-sulfonated DABCO as a new and efficient catalyst. This reagent is also efficiently able to catalyze the condensation of aldehydes with barbituric acid leading to 5-arylmethylene-pyrimidine-2,4,6-triones. The structure of the products was characterized by their IR, 1H NMR, and 13C NMR spectroscopy. The present methodology offers several advantages such as ease of preparation and handling of the catalyst, high yields, simple and green procedure, low cost, short reaction times, easy work-up, and preformation of the reaction in the absence of solvent or in water as a green solvent.
Comparison of the efficiency of two imidazole-based dicationic ionic liquids as the catalysts in the synthesis of pyran derivatives and Knoevenagel condensations
([C4(MIm)2]·2HSO4) were prepared via adequate, solvent-free methods and characterized using FT-IR, 1H NMR, 13C NMR, and potentiometric titration techniques. These reagents were investigated in the synthesis of 5-arylidene (thio)barbituric acids, 2-arylidene malononitriles, 4H-pyrans, and pyrano[2,3-d] pyrimidineones, and their catalytic activities were compared in the promotion of these reactions. Based