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
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