Phosphine‐Free Manganese(II)‐Catalyst Enables Acceptorless Dehydrogenative Coupling of Alcohols with Indoles
作者:Vinita Yadav、Ekambaram Balaraman、Santosh B. Mhaske
DOI:10.1002/adsc.202100621
日期:2021.9.21
molecularly defined NNN−Mn(II) pincer complex catalyzed acceptorless dehydrogenative coupling of alcohols with indoles is reported. A wide variety of symmetrical and unsymmetrical bis(indolyl)methane derivatives as well as some structurally important products such as Vibrindole A, Turbomycin B alkaloid, Antileukemic, and Anticancer agents were synthesized. Mechanistic studies illustrate the importance
本文报道了一种空气稳定的、分子定义的 NNN-Mn(II) 钳形复合物催化醇与吲哚的无受体脱氢偶联。合成了多种对称和非对称双(吲哚基)甲烷衍生物以及一些结构上重要的产品,如 Vibrindole A、Turbomycin B 生物碱、抗白血病和抗癌剂。机理研究说明了 NH 部分在配合物中的重要性以及金属-配体合作在催化过程中的关键作用。
Lanthanum(III) Nitrate Hexahydrate: A Versatile Reagent for the Synthesis of Bis(indolyl) Methanes under Solvent‐Free Conditions
作者:J. Jon Paul Selvam、M. Srinivasulu、N. Suryakiran、V. Suresh、S. Malla Reddy、Y. Venkateswarlu
DOI:10.1080/00397910801982118
日期:2008.5
Abstract A mild and efficientsynthesis of bis(indolyl) methanes by the reaction of indoles with various aldehydes at roomtemperature in the presence of a catalytic amount of a La(NO3)3 · 6H2O afforded the corresponding bis(indolyl) methanes in excellent yields under solvent‐free conditions.
Expeditious, Mild and Solvent Free Synthesis of Bis(indolyl)methanes, Using a Mixture of Phosphorus Pentoxide in Methanesulphonic Acid
作者:Amulrao U. Borse、Mahesh N. Patil、Nilesh L. Patil
DOI:10.1155/2012/637536
日期:——
Highly rapid and efficient synthesis of Bis(indolyl)methanes has been developed by using a mixture of phosphorus pentoxide in methanesulphonic acid (Eaton’s reagent) at ambient temperature under solvent free condition.
A Simple and Efficient Supramolecular Chemistry Approach for Synthesis of Bis(indolyl)methanes Using Aqueous β-Cyclodextrin as Green Promoter Host
作者:Sameer I. Shaikh、Zahid Zaheer、Santosh N. Mokale
DOI:10.2174/1570178614666170811123132
日期:2017.12.11
the reaction was monitored by TLC using ethyl acetate:hexane (7:3) as a mobile phase. The identity and purity of the products were confirmed by MASS, 1H NMR, and 13C NMR. Results: This report describes supramolecularsynthesis of bis(indolyl)methanes 3(a-o) using β-cyclodextrin (1.0 mol%) in water at 60°C. The synthesized compounds 3(a–o) were obtained in excellent yields (80-92 %) in less reaction
背景:近年来,据报道各种双杂环化合物具有多种生物活性。双(吲哚基)甲烷及其衍生物通常存在于3000多种天然分离物中,据报道其具有广泛的生物活性。尽管报道了双(吲哚基)甲烷的合成方法很多,但仍需要开发一种绿色环保的合成方案,这反过来对于经济和合成观点很重要。 方法:超分子化学方法通过吲哚1(2.0 mmol)与取代醛2(ao)(1.0 mmol)在60°C下的缩合反应有效地用于合成双(吲哚基)甲烷衍生物3(ao)。水中的β-环糊精。通过TLC使用乙酸乙酯:己烷(7∶3)作为流动相监测反应进程。产物的身份和纯度通过MASS,1 H NMR和13 C NMR确认。 结果:该报告描述了在60°C的水中使用β-环糊精(1.0 mol%)超分子合成双(吲哚基)甲烷3(ao)的方法。以更少的反应时间(20-40分钟)以优异的收率(80-92%)获得了合成的化合物3(a-o)。β-环糊精与一种反应物的疏水结合通过1
Synthesis and characterization of Polyindole and its catalytic performance study as a heterogeneous catalyst
The catalytic performance study of polyindole as a heterogeneous catalyst is reported for the synthesis of 3,3’-arylmethylene-bis-1H-Indole derivatives using various substituted aldehydes and indole under reflux reaction condition with good to excellent yield. Polyindole was synthesized by chemical oxidative polymerization using citric acid as a dopant. The synthesized polymer was well characterized by various spectroscopic techniques like FT-IR, XRD, FESEM, etc. The XRD pattern confirms the partially crystalline nature of polyindole. The FESEM images of polyindole revealed the formation of irregularly shaped particulate nature with size in the range of 0.2 to 6 micron. In FT-IR spectrum, the major peak at ∼ 3400 cm−1 indicates N-H stretching and at 1564 −1624 cm −1 indicates C-C stretching of benzenoid ring of indole. The presence of peak at ∼ 3400 cm−1 indicates that the polymerization does not occur at nitrogen. The present protocol has certain advantages like recyclability, low loading of the catalyst, low-cost and efficient use of polyindole as a heterogeneous catalyst.