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 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.