通过连续反应得到了新型杂环体系2-(2-(芳基)-9-(芳基)咪唑[1,2- c ]噻吩并[3,2- e ]嘧啶-3-基)乙酸乙酯的衍生物分四个阶段;苯乙酮衍生物与丙二腈进行Knoevenagel缩合,得到2-(1-芳基亚乙基)丙二腈,后者封闭噻吩环,形成3-氨基-2-5-芳基噻吩并[2,3-d]嘧啶-4-胺甲酰胺,以及3-氨基-2-5-芳基噻吩[2,3- d]嘧啶-4-胺环、Meldrum酸和各种芳基乙二醛。新化合物的结构根据元素分析和光谱数据得到确认。还检查了一些选定的合成化合物的抗癌活性。虽然化合物10a-j对于所测试的三种细胞系并不是相当有效,但与依托泊苷相比,化合物10c还是有一定潜力的。
Synthesis of Polyfunctionally Substituted Thiophene, Thieno[2,3-b]pyridine and Thieno[2,3-d]pyrimidine Derivatives
作者:Wagnat W. Wardakhan、Hoda Z. Shams、Hosam E. Moustafa
DOI:10.1080/104265090889422
日期:2005.8.1
The thiophne derivatives 4a–c were prepared according to the Gewald procedure. Their reactivity towards a variety of chemical reagents was studied to give thienopyridines and pyrimidines. Biological investigations were carried on the newly synthesized products.
Ethylene diamine grafted nanoporous UiO-66 as an efficient basic catalyst in the multi-component synthesis of 2-aminithiophenes
作者:N. Erfaninia、R. Tayebee、M. Dusek、M.M. Amini
DOI:10.1002/aoc.4307
日期:2018.5
effective solid nanoporousbasiccatalyst prepared through the amine grafting onto the pores of UiO‐66. The manufactured nanoparticles were identified by FT‐IR, XRD, TGA, FESEM, TEM, CHN and BET and the characterization results certified formation of a single phase nanoporous substance with the medium grain size less than 90 nm. The synthesized material was employed as an efficientcatalyst for the preparation
<scp>2‐Amino</scp>‐4‐arylthiophene‐3‐carbonitrile and formamidine acetate as key building units for the synthesis of <scp>5‐arylthieno</scp>[2,3‐<i>d</i>]pyrimidin‐4‐amines
method for the synthesis of 5-arylthieno[2,3-d]pyrimidin-4-amine analogues via three-step reactions and examined the changes in the solvent, time, and temperature. A novel condition has been developed for the preparation of substituted 2-aminothiophenes employing the Knoevenagel condensation followed by the Gewald method and in the last step to form thieno[2,3-d]pyrimidines by using formamidine acetate
我们试图建立一种通过三步反应合成5-芳基噻吩并[2,3- d ]嘧啶-4-胺类似物的方法,并考察了溶剂、时间和温度的变化。开发了一种新的条件,用于制备取代的 2-氨基噻吩,采用 Knoevenagel 缩合,然后采用 Gewald 方法,最后一步使用乙酸甲脒形成噻吩并[2,3- d ]嘧啶。所有合成的5-芳基噻吩并[2,3- d ]嘧啶-4-胺都是未知的,并通过IR、1 H-NMR、13 C-NMR和CHN分析进行了表征。
A facile and practical one-pot synthesis of multisubstituted 2-aminothiophenes via imidazole-catalyzed Gewald reaction
A simple and efficient procedure was developed for the synthesis of multisubstituted 2-aminothiophene derivatives. In the presence of catalytic amount of imidazole, ketones or aldehydes, dicyanomethane and elemental sulfur were converted into the corresponding 2-aminothiophene derivatives in moderate to high yields in DMF at 60 degrees C. (C) 2011 Elsevier Ltd. All rights reserved.
Easy single-step preparation of ZnO nano-particles by sedimentation method and studying their catalytic performance in the synthesis of 2-aminothiophenes via Gewald reaction
作者:Reza Tayebee、Farzad Javadi、Gholamreza Argi
DOI:10.1016/j.molcata.2012.11.011
日期:2013.3
Zinc oxide is a multi-purpose active material with important catalytic applications. In this study, nano-sized ZnO particles were easily synthesized through sedimentation of zinc acetate di-hydrate in absolute ethanol and were characterized by XRD and SEM. The XRD results indicated pure wurtzite structure with the average particle size of 26.9 nm for the nano-particles. It was observed that size of ZnO nano-particles was decreased while solution concentration was increased. This observation would be explained considering enhancing nucleation processes of nano-particles at high concentration of zinc acetate. The prepared nano-particles (2.5 mol%) were used as catalyst for the fast and efficient synthesis of 2-aminothiophenes under solvent free conditions. The three-component mixture of a carbonyl compound, malonodinitrile, and elemental sulfur was converted into the corresponding 2-aminothiophene in moderate to high yields with excellent selectivity. (C) 2012 Elsevier B.V. All rights reserved.