Uncatalyzed addition of indoles and N-methylpyrrole to 3-formylchromones: synthesis and some reactions of (chromon-3-yl)bis(indol-3-yl)methanes and E-2-hydroxy-3-(1-methylpyrrol-2-ylmethylene)chroman-4-ones
Synthesis and characterization of a tetracationic acidic organic salt and its application in the synthesis of bis(indolyl)methanes and protection of carbonyl compounds
A new tetracationic acidic organic salt (TCAOS) based on DABCO was prepared, characterized and applied as an eco-friendly, powerful and reusable catalyst for the synthesis of bis(indolyl)methanes from indoles and carbonylcompounds in water with high turnover frequency (TOF). Also, this catalyst was successfully applied for acetalization of carbonylcompounds with diols under solvent-free conditions
Uncatalyzed addition of indoles and N-methylpyrrole to 3-formylchromones: synthesis of (chromon-3-yl)bis(indol-3-yl)methanes and E-2-hydroxy-3-(1-methylpyrrol-2-ylmethylene)chroman-4-ones under solvent-free conditions
作者:Vyacheslav Ya. Sosnovskikh、Roman A. Irgashev
DOI:10.1016/j.tetlet.2007.08.078
日期:2007.10
(Chromon-3-yl)bis(indol-3-yl)methanes and E-2-hydroxy-3-(1-methylpyrrol-2-ylmethylene)chroman-4-ones have been obtained in good yields from 3 -formylchromones on reaction with indoles and N-methylpyrrole under solvent-free conditions. (C) 2007 Elsevier Ltd. All rights reserved.
Oxalic acid dihydrate: Proline (LTTM) as a new generation solvent for synthesis of 3,3-diaryloxindole and chromone based bis(indolyl)alkanes: Green, chromatography free protocol
The new green approach has been used for the reaction of indole with various carbonyl compounds. The attractive features of this protocol are the use of green reaction medium, good to excellent product yields, operational simplicity, easy workup procedures and the use of group assistance purification process avoiding chromatographic purification. This protocol is expected to find application in the combinatorial synthesis of biologically active compounds, since indole and chromone motifs have a broad spectrum of biological activities. (C) 2015 Elsevier B.V. All rights reserved.
Uncatalyzed addition of indoles and N-methylpyrrole to 3-formylchromones: synthesis and some reactions of (chromon-3-yl)bis(indol-3-yl)methanes and E-2-hydroxy-3-(1-methylpyrrol-2-ylmethylene)chroman-4-ones
作者:Vyacheslav Ya. Sosnovskikh、Roman A. Irgashev、Anna A. Levchenko
DOI:10.1016/j.tet.2008.05.032
日期:2008.7
(Chromon-3-yl)bis(indol-3-yl)methanes and E-2-liydroxy-3-(1-methylpyrrol-2-ylmethylene)chroman-4-ones have been obtained in good yields from 3-formylchromones on reaction with indoles and N-methylpyrrole under solvent-free conditions. Reactions of (chromon-3-yl)bis(indol-3-yl)methanes with guanidine carbonate and hydrazine hydrate proceed with the participation of the chromone ring system and lead to the formation of the corresponding pyrimiclines and pyrazoles bearing the bis(indol-3-yl)methyl moiety. (C) 2008 Elsevier Ltd. All rights reserved.
Xanthan sulfuric acid: An efficient and biodegradable solid acid catalyst for the synthesis of bis(indolyl)methanes under solvent-free conditions
作者:Zeba N. Siddiqui、Saima Tarannum
DOI:10.1016/j.crci.2013.04.013
日期:2013.9
Résumé Xanthan sulfuric acid (XSA) is found to be an efficient catalyst for the electrophilic substitution reaction of indole with aromatic aldehydes to afford the corresponding bis(indolyl)methanes at room temperature under solvent-free conditions. The catalyst was characterized for the first time with the help of powder XRD, SEM–EDX and DSC–TGA. The attractive features of this green, new methodology are excellent yield of products, clean reaction profile, reusability of the catalyst, energy sustainable protocol, simple experimental and easier work-up procedures.