Efficient one-pot synthesis of spiro[indoline-3,4′-pyrazolo[3,4-e][1,4]thiazepine]dione via three-component reaction
作者:Hui Chen、Daqing Shi
DOI:10.1016/j.tet.2011.05.069
日期:2011.8
An efficientone-potsynthesis of spiro[indoline-3,4′-pyrazolo[3,4-e][1,4]thiazepine] dione derivatives via three-component reaction of 5-amino-3-methylpyrazole, isatin, and thioacid is described. This new protocol produces novel heptacyclic spirooxindole derivatives in good yields in comparison to conventional pentacyclic compounds. This method proceeds through a 3-(5-aminopyrazol-3-yl)-3-hydroxy-2-oxindoline
通过5-氨基-3-甲基吡唑,靛红和三价胺的三组分反应,高效一锅合成螺[吲哚啉-3,4'-吡唑并[3,4- e ] [1,4]噻氮平]二酮衍生物描述了硫代酸。与常规的五环化合物相比,该新方案以高收率生产了新颖的七环螺氧基吲哚衍生物。该方法通过3-(5-氨基吡唑-3-基)-3-羟基-2-氧代二氢吲哚中间体(Baylis-Hillman型加合物)进行,不同于传统方法中的3-吲哚基丙氨酸(类似席夫碱的中间体)。一种代表性化合物的结构已经通过X射线衍射分析确认。
Synthesis of New Oxindoles and Determination of Their Antibacterial Properties
作者:Pablo E. Romo、Braulio Insuasty、Rodrigo Abonia、María del Pilar Crespo、Jairo Quiroga
DOI:10.1155/2020/8021920
日期:2020.2.8
A versatile method for the synthesis of new oxindoles was developed by the reaction between substituted isatins and 5-aminopyrazoles. The reaction was carried out at room temperature in ethanol using p-toluenesulfonic acid as the catalyst. The products were obtained with acceptable to excellent yields (44–96%). Structures of the new compounds were unambiguously established by spectroscopic and analytical
Efficient Domino Strategy for the Synthesis of Substituted Bipyrazole Derivatives
作者:Xi Zhang、Kai Long、Jiayi He、Jialian Fu、Furen Zhang、Chunmei Li
DOI:10.1002/jhet.3096
日期:2018.3
An efficient domino strategy for the synthesis of bipyrazole derivatives has been established successfully using Y(OTf)3 as catalyst. This new reaction allows direct formation of highly functionalized bipyrazole derivatives with a wide diversity in substituents in a one‐pot manner. The present synthesis shows attractive characteristics, such as the use of water as reaction media, simple one‐pot operation
New four-component reactions in water: a convergent approach to the metal-free synthesis of spiro[indoline/acenaphthylene-3,4′-pyrazolo[3,4-b]pyridine derivatives
作者:Kamaraj Balamurugan、Subbu Perumal、J. Carlos Menéndez
DOI:10.1016/j.tet.2011.03.020
日期:2011.5
New four-component domino reactions are described that allow the one-pot synthesis of spiro[indoline/acenaphthylene-3,4'-pyrazolo[3,4-b]pyridine derivatives from the reaction of phenylhydrazine, 3-aminocrotononitrile, isatin/acenaphthylene-1,2-dione, and cyclic 1,3-dicarbonyl compounds, including cyclohexane-1,3-diones, barbituric acid, and 2-thioxodihydropyrimidine-4,6(1H,5H)-dione, in the presence of (+/-)-camphor-10-sulfonic acid (CSA). These processes take place in water and involve the generation of two rings and five new bonds (two C-C, two C-N and one C = N) in a single synthetic operation, with expedient work-up and diminished waste generation due to the absence of extraction and purification steps. (C) 2011 Elsevier Ltd. All rights reserved.