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。
1,4-Diazabicyclo[2.2.2]octanium Diacetate under Grinding: Efficient and Eco-Friendly Process for the Synthesis of Symmetric, Unsymmetric and New Bis di(indolyl)indolin-2-one
作者:Leila Zare Fekri、Mohammad Nikpassand
DOI:10.2174/1570178614666170511164853
日期:2017.7.19
mild condition and simple work-up procedures. The catalyst could be easily recovered and reused for six cycles with almost consistent activity. All of the synthesized compounds were characterized by their physical constant, comparison with authentic samples, IR, 1H NMR, 13C NMR spectroscopy and elemental analysis. Methods: A mixture of isatin derivatives (1 mmol) or synthesized bis isatin (0.5 mmol)
背景:已经开发了一种简便,有效,新的绿色方法,用于在1,4-二氮杂双环存在下通过吲哚衍生物与各种靛红的亲电缩合反应合成3,3-二(吲哚基)吲哚-2-酮。 [2.2.2]醋酸双乙酸铵在研磨时作为有效的均质介质。这项工作始终具有以下优势:产量高,反应时间短,条件温和且后处理程序简单。该催化剂可以容易地回收并以几乎恒定的活性重复使用六个循环。所有合成的化合物的特征在于它们的物理常数,与真实样品的比较,IR,1H NMR,13C NMR光谱和元素分析。 方法:将研钵衍生物(1毫摩尔)或合成的双矶素(0.5毫摩尔),吲哚衍生物(2毫摩尔)和[DABCO]二氢乙酸盐(0.5毫摩尔)的混合物加入研钵中,并用研杵将其粉碎,所需的反应时间。反应完成后,如TLC所示,将反应混合物溶于20mL H 2 O中。过滤分离产物,并从EtOH中重结晶,干燥,得到粉末状化合物3a-n。减压浓缩滤液,并用乙醚洗涤。然后,将
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。
Efficient Synthesis of 3,3-diaryloxindoles Catalyzed by L-prolinate Anion Immobilized onto Amberlite as a Novel Heterogeneous Organocatalyst
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