Synthesis and application of silica phenyl sulfonic acid as a solid acid heterogeneous catalyst for one-pot synthesis of 2-aryl-1-arylmethyl-1H-1,3-benzimidazoles and bis(indolyl)methanes in water
作者:Hojat Veisi、Alireza Sedrpoushan、Mohammad Ali Zolfigol、Farajollah Mohanazadeh
DOI:10.1002/jhet.765
日期:2011.11
Silica phenyl sulfonicacid (SPSA) was prepared and effectively used in the one‐pot synthesis of 2‐aryl‐1‐arylmethyl‐1H‐1,3‐benzimidazoles from o‐phenylenediamine with aldehydes in water in the presence of tetrabutyl ammonium bromide with good to high yield. Also, SPSA was used as a catalyst for the synthesis of bis(indolyl)methanes in water. J. Heterocyclic Chem., (2011).
Ultrasound assisted green synthesis of bis(indol-3-yl)methanes catalyzed by 1-hexenesulphonic acid sodium salt
作者:Ratnadeep S. Joshi、Priyanka G. Mandhane、Santosh D. Diwakar、Charansingh H. Gill
DOI:10.1016/j.ultsonch.2009.08.015
日期:2010.2
1-Hexenesulphonic acidsodiumsalt as catalyst for green synthesis of bis(indol-3-yl)methanes was described. The reaction of indole with various aldehydes in water using ultrasound irradiation at ambient temperature for appropriate time using 1-hexenesulphonic acidsodiumsalt furnish the desired product in good to excellent yield. Utilization of aqueous medium, simple reaction conditions, isolation
Facile Synthesis of Bis(indolyl)methanes Using LaCl<sub>3</sub>· 7H<sub>2</sub>O as a Mild and Efficient Catalyst in Molten Salt Media
作者:Neda Seyedi、Kazem Saidi、Hojatollah Khabazzadeh
DOI:10.1080/00397910802604224
日期:2009.4.22
Abstract Efficient electrophilic substitution reaction of indole with various carbonyl compounds were carried out using a catalytic amount of LaCl3 · 7H2O in molten tetraethylammonium chloride as an ionic liquid to afford the corresponding bis(indolyl)methanes in excellent yields.
Zirconium(IV)-modified silica@magnetic nanocomposites: Fabrication, characterization and application as efficient, selective and reusable nanocatalysts for Friedel–Crafts, Knoevenagel and Pechmann condensation reactions
作者:R.K. Sharma、Yukti Monga、Aditi Puri
DOI:10.1016/j.catcom.2013.02.016
日期:2013.5
A highly efficient and magnetically retrievable zirconium(IV) based nanocatalyst has been synthesized by covalent grafting of 3-hydroxy-2-methyl-1,4-naphthoquinone onto amine functionalized silica coated magnetic nanoparticles followed by complexation with ZrOCl2. The structural and magnetic properties of obtained nanocatalyst are identified by TEM, SEM, XRD, EDS, VSM and FT-IR analyses. The potential of resultant organic-inorganic hybrid nanocatalyst was effectively evaluated for the range of organic transformations such as Friedel-Crafts, Knoevenagel and Pechmann condensation reactions. The magnetically recoverable nano-hybrid catalyst presented high TON and chemoselectivity with the ease of reusability for multiple cycles without any appreciable loss in its catalytic activity. (C) 2013 Elsevier B.V. All rights reserved.
A New Catalytic Application of a Keggin Acid in the Synthesis of Symmetrical Bis(indolyl)alkanes