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。
First Aminocatalytic Synthesis of Bis(indolyl)methanes and DFT Studies on the Reaction Pathway
作者:Grace Basumatary、Rahul Mohanta、Satyajit Dey Baruah、Ramesh Ch. Deka、Ghanashyam Bez
DOI:10.1007/s10562-019-02932-2
日期:2020.1
Abstract Carbon–carbonbond-formation by aminocatalytic nucleophilic addition to aryl aldehyde ideally generates addition–elimination product. Here, we report an unexpected, yet efficient aminocatalytic nucleophilic addition of indole to aryl aldehydes to synthesize pharmacologically important bis(indolyl)methanes via aminocatalytic addition substitution reaction. Although many acid catalysed synthesis
Highly Efficient Povidone-Phosphotungstic Acid Catalyst for the Tandem Acetalization of Aldehydes to Bis- and Tris(indolyl)methanes
作者:Sumit B. Kamble、Rameshwar K. Swami、Sachin S. Sakate、Chandrashekhar V. Rode
DOI:10.1002/cplu.201300248
日期:2013.11
A novel, nonleachable hybrid of heteropoly acid and polyvinylpyrrolidone (or povidone) catalyzes the acetalization of aldehydes in methanol at roomtemperature followed by reaction with indole to give bis(indolyl)methanes (BIMs) and tris(indolyl)methanes (TIMs) in quantitative yields (90-97 %). The catalyst was shown by pyridine FTIR spectroscopy to possess Brønsted acidity, and the hybrid formation
新型,不可浸出的杂多酸和聚乙烯吡咯烷酮(或聚维酮)的杂物在室温下催化甲醇中醛的缩醛化,然后与吲哚反应生成定量的双(吲哚基)甲烷(BIM)和三(吲哚基)甲烷(TIM)收率(90-97%)。吡啶FTIR光谱表明该催化剂具有布朗斯台德酸度,并且通过XRD和31 P NMR研究证实了杂化物的形成。用几种类型的羰基和吲哚底物建立了吲哚的Friedel-Crafts烷基化以及BIM和TIM的串联合成,以定量得到相应的产物。该催化剂有效地再循环了三个连续的运行而没有失去其原始活性。
(Thio)urea-catalyzed Friedel-Crafts Reaction: Synthesis of Bis(indolyl)- methanes
作者:Juan A. Rivas-Loaiza、Carlos E. Reyes-Escobedo、Yliana Lopez、Susana Rojas-Lima、Juan Pablo García-Merinos、Heraclio López-Ruiz
DOI:10.2174/1570178616666190222150915
日期:2019.10.9
products vibrindole A (3n), arsindoline A (3i), arundine (3o) and tris(1H-indol-3-yl)methane (3j). Additionally, the synthesis of streptindole was carried out via intermediate 3g. This methodology is well suited for the synthesis of bis(indolyl)methanes: it offers good yields of products, low sensitivity to moisture and oxygen, high tolerance to different functional groups on the aldehydes such as alkynes
Solvent-Free Addition of Indole to Aldehydes: Unexpected Synthesis of Novel 1-[1-(1H-Indol-3-yl) Alkyl]-1H-Indoles and Preliminary Evaluation of Their Cytotoxicity in Hepatocarcinoma Cells
New 1-[1-(1H-indol-3-yl) alkyl]-1H-indoles, surprisingly, have been obtained from the addition of indole to a variety of aldehydes under neat conditions. CaO, present in excess, was fundamental for carrying out the reaction with paraformaldehyde. Under the same reaction conditions, aromatic and heteroaromatic aldehydes afforded only classical bis (indolyl) aryl indoles. In this paper, the role of CaO