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 N-sulfonic acid hydrogen sulfate as an efficient ionic liquid catalyst for the synthesis of 5-arylmethylene-pyrimidine-2,4,6-trione and pyrano[2,3-d]pyrimidinone derivatives
([SuSA-H]HSO4) as a new ionic liquid is prepared and characterized using a variety of techniques, including infrared spectra (FT-IR), 1H and 13C NMR, scanning electron microscopy, a massspectra method, as well as by Hammett acidity function. The prepared reagent is efficiently able to catalyze the preparation of 5-arylmethylene-pyrimidine-2,4,6-triones via the condensation of aldehydes and barbituric acid
使用多种技术制备并表征了琥珀酰亚胺 N- 磺酸硫酸氢盐([SuSA-H] HSO 4),并使用多种技术进行了表征,包括红外光谱(FT-IR),1 H和13 C NMR,扫描电子显微镜,质谱方法以及Hammett酸度函数。通过醛和巴比妥酸的缩合,所制备的试剂能够有效地催化5-芳基亚甲基-嘧啶-2,4,6-三酮的制备。进一步的研究表明,醛与巴比妥酸和丙二腈的缩合反应生成吡喃并[2,3- d 在该试剂的存在下,也可以有效地促进]嘧啶酮衍生物。本发明的方法具有几个优点,包括易于制备和处理催化剂,简单和容易的后处理,短的反应时间,产物的高产率和催化剂的可回收性。
Knoevenagel condensation in aqueous media promoted by 2,2′-bipyridinium dihydrogen phosphate as a green efficient catalyst
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。
Latent inhibitors. Part 7. Inhibition of dihydro-orotate dehydrogenase by spirocyclopropanobarbiturates
作者:William Fraser、Colin J. Suckling、Hamish C. S. Wood
DOI:10.1039/p19900003137
日期:——
synthesized. Dihydro-orotate dehydrogenase from Clostridium oroticum was shown to be inhibited by these compounds. A related series of 5-membered-ring compounds (hydantoins and pyrazoles) was prepared but all the compounds were found to be inactive. In order to correlate these observations with previous results concerning 5-arylmethylhydantoins and 5-arylidene-hydantoins as inhibitors, 5-arylidenebarbiturates
Abstract Several benzaldehydes were condensed with barbituric acid under infrared irradiation, in absence of solvent, affording the corresponding 5-benzylidene barbituric acids.