for heterogenization of L‐proline organocatalyst is based on non‐covalent ion‐pair immobilization of L‐proline on the surface of anion‐exchange resin amberlite IRA900OH (AmbIRA900OH) as a commercially accessible cationic polymer support. The prepared heterogeneousorganocatalyst was well characterized by using of FTIR, TGA, DTG, XRD and elemental analysis techniques. The catalytic activity of the catalyst
据报道,固定在琥珀色IRA900OH上的L-脯氨酸根阴离子([Amb] L-脯氨酸根)是一种新型,可重复使用且廉价的有机催化剂,可用于吲哚与靛红的缩合反应,从而在回流条件下在乙醇中提供相应的3,3'-二芳基氧吲哚衍生物。[Amb] L-脯氨酸盐是通过处理MeOH / H 2获得的在60°C下用Amberlite IRA900OH溶解L-脯氨酸的溶液。L-脯氨酸有机催化剂的杂化程序基于将L-脯氨酸非共价离子对固定在阴离子交换树脂amberlite IRA900OH(AmbIRA900OH)的表面上,作为市售的阳离子聚合物载体。使用FTIR,TGA,DTG,XRD和元素分析技术对制备的多相有机催化剂进行了很好的表征。还在吲哚和靛红的反应中检查了催化剂的催化活性。已回收催化剂,并在8次运行中确认了可重复使用性
Synthesis of 3,3-diindolyl oxyindoles efficiently catalysed by FeCl3 and their in vitro evaluation for anticancer activity
作者:Ahmed Kamal、Y.V.V. Srikanth、M. Naseer A. Khan、Thokhir Basha Shaik、Md. Ashraf
DOI:10.1016/j.bmcl.2010.06.152
日期:2010.9
A simple and highly efficient method has been developed for the synthesis of 3,3-diindolyl oxyindoles by the reaction of indoles with isatin or 5-fluoro isatin using a catalytic amount (5 mol %) of FeCl3 at room temperature in a short reaction time in high yields. All these compounds were evaluated against a panel of five human cancer lines and most of them showed potent cytotoxicity. Compound 4b showed IC50 of 4.7 and 5 mu M against SK-N-SH and DU-145 cell lines, respectively, whereas 4c, 4d, 4f and 4k showed IC50 of 2.2, 1.2, 3.6 and 3.6 mu M, respectively, against DU-145 cell line. Interestingly, some of the compounds are selectively potent in prostate cancer (DU-145) with IC50 values of 1.2-19.6 mu M. (C) 2010 Elsevier Ltd. All rights reserved.
HFIP-promoted catalyst-free cascade reactions for the synthesis of biologically relevant 3,3-di(indolyl)indolin-2-ones from indoles and isatins
作者:Xiaohan Yuan、Shuai Wang、Jialing Cheng、Bin Yu、Hong-Min Liu
DOI:10.1016/j.cclet.2020.03.025
日期:2020.9
The first HFIP-promoted catalyst-free cascadereactions for the synthesis of biologically relevant 3,3-di(indolyl)indolin-2-ones (27 examples, up to 98% yield) from readily available indoles and isatin derivatives are described. This protocol shows well tolerance of different functional groups and features extremely mild reaction conditions such as short reaction time (∼ 1 h), no usage of catalyst, easy