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
作者:Kartikey Dhar Dwivedi、Sameer Reddy Marri、Satish Kumar Nandigama、L. Raju Chowhan
DOI:10.1080/00397911.2018.1518456
日期:2018.10.18
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
摘要 我们在此介绍了一种无柱色谱的非均相二氧化钛纳米颗粒 (TiO2 NPs) 的开发报告,该纳米颗粒催化 3-甲基-4-硝基-5-烯基异恶唑和 3-甲基-5-吡唑啉酮的 1, 6 Michael 加成反应。首次通过吲哚与靛红在室温下在水中反应快速合成 3,3-二(吲哚基)吲哚-2-酮。在 1, 6 Michael 加成反应和 3,3-双(吲哚基)羟吲哚产物的情况下,获得了中等至良好的产率。两种反应均成功进行了克级放大实验。进行了 4 个循环的可回收性实验,并为两个反应提供了每个循环的周转频率 (TOF) 计算,这清楚地表明了该协议的可持续性。此外,绿色化学矩阵(原子经济性、反应质量效率 (RME)、E 因子、过程质量强度 (PMI))值表明所提出的方法是绿色环保的。图形概要