We describe a direct construction of all-carbon quaternary centers from secondary C(sp3)–H substrates through a dehydrogenativecross-couplingreaction. Using FeCl2·4H2O as the catalyst and employing air (molecular oxygen) as the terminal oxidant, the cross-coupling of indolin-2-ones with indoles proceeded smoothly under mild, ligand-free and base-free conditions, providing 3,3-disubstituted oxindoles
Fe(III) @g-C3N4 nanocomposite-catalyzed green synthesis of di-indolyloxindole derivatives
作者:Ali Allahresani、Bahare Taheri、M. A. Nasseri
DOI:10.1007/s11164-018-3519-5
日期:2018.11
characterized by various techniques; including X-ray diffraction, Fourier-transform infrared spectroscopy, and transmission electron microscopy. Then, the 3-indolylation reaction of isatin with indole derivatives was carried out in the presence of the Fe(III)/g-C3N4 nanocomposite in water in reflux conditions. The results showed that the corresponding products were synthesized in excellent yields (up to 96%)
通过用gC 3 N 4浸渍FeCl 3可以简单地合成Fe(III)/ gC 3 N 4纳米复合材料,并通过各种技术对其进行表征。包括X射线衍射,傅立叶变换红外光谱和透射电子显微镜。然后,在Fe(III)/ gC 3 N 4的存在下,进行靛红与吲哚衍生物的3-吲哚化反应。在回流条件下在水中形成纳米复合材料。结果表明,相应的产物在短时间内(30分钟)以优异的产率(高达96%)合成。该方案的显着特征是无毒溶剂,绿色介质,短反应时间和高收率。
SiO2/g-C3N4 nanocomposite-catalyzed green synthesis of di-indolyloxindols under mild conditions
作者:Ali Allahresani、Mohammad Ali Nasseri、Alireza Nakhaei
DOI:10.1007/s11164-017-2994-4
日期:2017.11
formation reaction. The Friedel–Crafts 3-indolylation reaction of isatin with indole derivatives was investigated in the presence of a catalytic amount of SiO2/g-C3N4 nanocomposite at ambient temperature in water as a green medium. The results showed that the corresponding products were obtained in good to excellent yields. In addition, the electron-releasing groups in the R1 position of the indole ring
在这项研究中,引入了一种简便且良性的方案,用于将SiO 2纳米颗粒固定在gC 3 N 4纳米片上。相应的纳米复合材料(SiO 2 / gC 3 N 4)通过各种技术进行了表征,包括X射线衍射,透射电子显微镜,热重分析和傅立叶变换红外光谱。在C–C键形成反应中研究了SiO 2 / gC 3 N 4纳米复合材料的活性。在催化量SiO 2 / gC存在下研究了Isatin与吲哚衍生物的Friedel-Crafts 3-吲哚化反应3 N 4纳米复合材料在环境温度下作为绿色介质在水中。结果表明,以良好至优异的产率获得了相应的产物。此外,在吲哚环的R 1位置的电子释放基团或在Isatin的R 4位置的吸电子基团具有优异的收率(91–95%)。该方法的一些优点包括反应时间短,产率高,后处理容易以及使用水作为绿色溶剂。
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...
An efficient synthesis of 3-indolyl-3-hydroxy oxindoles and 3,3-di(indolyl)indolin-2-ones catalyzed by sulfonated β-CD as a supramolecular catalyst in water
作者:Yogesh A. Tayade、Dipak R. Patil、Yogesh B. Wagh、Asha D. Jangle、Dipak S. Dalal
DOI:10.1016/j.tetlet.2014.12.012
日期:2015.1
rin (β-CD-SO3H) promoted efficient and fast electrophilic substitution reaction of indoles with various isatins reflux in water is reported affording various 3-indolyl-3-hydroxy oxindoles and 3,3-di(indolyl)indolin-2-ones in good to excellent yields in short reaction time.