Aqua mediated indium(III) chloride catalyzed synthesis of fused pyrimidines and pyrazoles
作者:Jitender M. Khurana、Ankita Chaudhary、Bhaskara Nand、Anshika Lumb
DOI:10.1016/j.tetlet.2012.04.001
日期:2012.6
The utilization of water as solvent and indium trichloride as promoter for the three-component combinatorial synthesis of a variety of bioactive pyrimidine and pyrazole derivatives (2–10) from aldehydes, 1,3-dicarbonyl compounds, and electron-rich amino heterocycles like 6-amino-1,3-dimethyl uracil and 3-methyl-1-phenyl-1H-pyrazol-5-amine catalyzed by indium trichloride under reflux has been studied
A facile synthesis of furo[3,4-<i>e</i>]pyrazolo[3,4-<i>b</i>]pyridine-5(7<i>H</i>)-one derivatives via three-component reaction in ionic liquid without any catalyst
作者:Da-Qing Shi、Fang Yang、Sai-Nan Ni
DOI:10.1002/jhet.103
日期:2009.5
A series of furo[3,4-e]pyrazolo[3,4-b]pyridine-5(7H)-one and indeno[2,1-e]pyrazolo[3,4-b]pyridine-5(1H)-onederivatives were synthesized via the three-component reaction of an aldehyde, 5-aminopyrazole and either tetronic acid or 1,3-indanedione in ionic liquid without any catalyst. The structures of the products have been established by spectroscopic data and further confirmed by X-ray diffraction
一系列呋喃并[3,4- e ]吡唑并[3,4- b ]吡啶-5(7 H)-一和茚并[2,1- e ]吡唑并[3,4- b ]吡啶-5(1通过醛的三组分反应合成了H)-一衍生物,5-氨基吡唑和tetronic酸或无需任何催化剂的离子液体中的1,3-茚满二酮。产品的结构已通过光谱数据确定,并通过X射线衍射分析进一步证实。该方法的优点是后处理更容易,反应条件温和,产率高以及对环境无害。J. Heterocyclic Chem。,46,469(2009)。
A novel and efficient one-pot synthesis of furo[3′,4′:5,6]pyrido[2,3-c]pyrazole derivatives using organocatalysts
作者:Chun-Ling Shi、Da-Qing Shi、Sung Hong Kim、Zhi-Bin Huang、Shun-Jun Ji、Min Ji
DOI:10.1016/j.tet.2007.12.053
日期:2008.3
A novel approach to one-pot synthesis of dihydrofuro[3′,4′:5,6]pyrido[2,3-c]pyrazole and indeno[2′,1′:5,6]pyrido[2,3-c]pyrazole derivatives have been investigated using organocatalysts that are recyclable. This new protocol has the advantages of environmental friendliness, higher yield, low cost, as well as convenient operation. The catalytic efficiency of various small organocatalysts such as l-proline
一锅合成二氢呋喃[3',4':5,6]吡啶[2,3- c ]吡唑和茚并[2',1':5,6]吡啶[2,3- c]的新方法已经使用可回收的有机催化剂研究了对吡唑衍生物。该新协议具有环境友好,产量高,成本低以及操作方便的优点。还研究了各种小的有机催化剂,例如l-脯氨酸,反式-4-羟基-1-脯氨酸,l-硫代脯氨酸,辛可尼定,(+)-辛可宁和dl-2-苯基甘氨酸的催化效率。
Pyrazolo-fused 4-azafluorenones as key reagents for the synthesis of fluorescent dicyanovinylidene-substituted derivatives
4-azafluorenones (indeno[1,2-b]pyrazolo[4,3-e]pyridines, IPP) 4a–x via the three-component reaction between indan-1,3-dione (1), benzaldehydes 2 and 5-amino-1-arylpyrazoles 3 is described. These compounds were successfully used as precursors of the novel dicyanovinylidene derivatives 7a–d containing different acceptor (A) or donor (D) aryl groups at position 4 of its fused system. The structures of products
Abstractmagnified imageNew fused indeno[1,2‐b]pyridine derivatives have been prepared in a multicomponent reaction from benzaldehydes, indanedione and the appropriate aminoheteroaryl compound. The simple methodology permitted the syntheses of a series of indeno[1,2‐b]pyrazolo[4,3‐e]pyridines 4 from 5‐aminopyrazol 1 and modulated by the corresponding benzaldehyde 2.