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
Exploring TiO<sub>2</sub> NPs as efficient catalyst for 1,6 Michael addition of 3-methyl-5-pyrazolone on 3-methyl-4-nitro-5-alkenyl isoxazoles and rapid synthesis of 3,3‐bis(indolyl)oxindoles in water
3-methyl-5-pyrazolone on 3-methyl-4-nitro-5-alkenyl isoxazoles and rapid synthesis of 3,3-di(indolyl)indolin-2-ones by reaction of indole on isatin at room temperature in water for the first time. Moderate to good yield was obtained in case of 1, 6 Michael addition reaction and quantitative yield in case of a 3,3‐bis(indolyl)oxindole products. A scale up experiment on gram scale was performed successfully
An Efficient and Green Method for the Synthesis of Oxindole Derivatives in Water
作者:G. Srihari、M. Marthanda Murthy
DOI:10.1246/cl.2008.268
日期:2008.3.5
An environmentally benign method for the synthesis of 3,3-di(3-indolyl)- and 3,3-di(2-pyrrolyl)oxindoles by using various isatins, indoles, and pyrrole in water in excellent yields and high regiose...
Introduction of novel brønsted acidic ionic liquids with perchlorate counter-anion for one-pot synthesis of symmetric 3,3′-diaryloxindoles
作者:Layla A. Taib、Mosadegh Keshavarz
DOI:10.1007/s11164-021-04419-5
日期:——
perchloric acid to obtain three novel Brønsted acidic ionicliquids. The prepared task specific ionicliquids and their stable intermediates were characterized by FT-IR, 1HNMR, 13C-NMR, UV–Vis, TGA and CHNS analysis techniques. The prepared ionicliquids are fully water soluble and have good thermalstability up to 200 °C or higher. Their catalytic efficiency was checked for the preparation of symmetric
electrochemical direct bisarylation of carbonyls with indole derivatives to afford the corresponding bis(indolyl)methane (BIM) derivatives is described. The developed protocol is suitable for aliphatic, aromatic, and heteroaromatic aldehydes, which react with various electron-rich and electron-poor indoles to afford the corresponding BIMs in good to excellent yields. Isatin derivatives also underwent