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。
DABCO-based ionic liquids: green and recyclable catalysts for the synthesis of barbituric and thiobarbituric acid derivatives in aqueous media
the reaction of barbituric or thiobarbituric acid, malononitrile and aldehydes in the presence of this reagent and 1,4-disulfo-1,4-diazabicyclo[2.2.2]octane-1,4-diium chloride ([DABCO](SO3H)2(Cl)2) has been investigated. The structure of the products was characterized using IR, 1H NMR and 13C NMR spectroscopy. The present methodologies suggests several advantages such as ease of the preparation and
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。
4,4’-trimethylenedipiperidine as a nitrogen heterocycle solvent and/or catalyst: Liquid phase tandem Knoevenagel–Michael condensation
作者:Lia ZAHARANI、Nader GHAFFARI KHALIGH、Hayede GORJIAN、Mohd RAFIE JOHAN
DOI:10.3906/kim-2010-41
日期:——
Liquid phase tandem Knoevenagel-Michael condensation of various aromatic and heteroaromatic aldehydes with barbituric acid or 2-thiobarbituric acid and malononitrile was studied in a one-pot three-component reaction. For the first time, TMDP was employed as a safe and efficient solvent and/or catalyst in the liquid and aqueous ethanol medium, respectively, for the practical and eco-friendly Knoevenagel-Michael
Nano-sawdust-OSO3H as a new, cheap and effective nanocatalyst for one-pot synthesis of pyrano[2,3-d]pyrimidines
作者:B. Sadeghi、M. Bouslik、M. R. Shishehbore
DOI:10.1007/s13738-015-0655-3
日期:2015.10
An atom-efficient, three-component synthetic methodology has been developed for the preparation of biologically important pyrano[2,3-d]pyrimidines using nano-sawdust-OSO3H as a new catalyst. The reaction involves the use of barbituric acid or thiobarbituric acid, malononitrile and aldehydes. A wide range of aldehydes is compatible in this reaction, producing excellent yields in short time. The morphology
已经开发了一种原子有效的三组分合成方法,用于使用纳米锯末-OSO 3 H作为新催化剂制备生物学上重要的吡喃并[2,3- d ]嘧啶。该反应涉及使用巴比妥酸或硫代巴比妥酸,丙二腈和醛。该反应可与多种醛相容,从而在短时间内产生出色的收率。使用扫描电子显微镜(SEM)观察了纳米催化剂(纳米锯末-OSO 3 H)的形态。通过热分析技术(TGA / DTG)研究了催化剂的分解步骤和热稳定性。木屑OSO 3通过能量色散X射线能谱(EDX)方法研究了H表面,以找出化学成分。另外,已经进行了催化剂的振动光谱分析(FT-IR)。
The One-Pot Synthesis of Pyrano[2,3-d]pyrimidinone Derivatives with 1,4-diazabicyclo[2.2.2]octane in Aqueous Media
作者:Javad Azizian、Abolghasem shameli、Saeed Balalaie、Mohammad Mehdi Ghanbari、Shahab Zomorodbakhsh、Mahdieh Entezari、Saleh Bagheri、Ghasem Fakhrpour
DOI:10.13005/ojc/280141
日期:2012.3.18
diazabicyclo(2.2.2)octane (DABCO) was used as a catalyst for one-pot, three- component condensation reactions consisting of aromatic aldehydes, malononitrile and thiobarbituric acid in aqueous ethanol at room temperature. This method has the advantages of a simple operation,mild reaction conditions, high yields, by using a less toxic and low cost chemical as a catalyst.