Sulfonated Organic Heteropolyacid Salts: Recyclable Green Solid Catalysts for the Highly Efficient and Green Synthesis of Bis(indolyl)methanes in Water
Development of an imidazole salt catalytic system for the preparation of bis(indolyl)methanes and bis(naphthyl)methane
作者:Xu Wang、Courtney C. Aldrich
DOI:10.1371/journal.pone.0216008
日期:——
Imidazolium salts are shown to catalyze the rapid room temperature reaction of indoles or naphthol with aldehydes to provide bis(indolyl)methanes or bis(naphthol)methane in excellent yields and the reaction proceeds optimally in dichloromethane with no base additives. The reaction exhibits a broad substrate tolerance and occurs through nucleophilic activation of the indoles and naphthols through a
Ionic Liquid Tributyl (Carboxymethyl) Phosphonium Bromide as an efficient Catalyst for the Synthesis of bis(indolyl)Methanes under Solvent-Free Conditions
作者:Ardeshir Khazaei、Mohammad Ali Zolfigol、Toktam Faal-Rastegar
DOI:10.3184/174751913x13787959859380
日期:2013.10
A simple green synthesis of bis (indolyl)methanes involved the reaction of indole with aldehydes in the presence of a phosphonium salt ionicliquid as the catalyst. The simple experimental procedures, short reaction times, high yields of product, non-toxic catalyst and the absence of solvent are the advantages of this method.
An efficient and facile synthesis of hydrazones, bis(indolyl)methanes and bis(4-hydroxycoumarin)methanes is facilitated by roomtemperature ionic liquid choline chloride–oxalic acid (ChCl:Ox). ChCl:Ox (10 mol%) efficientlycatalyzes condensation of aldehydes with phenylhydrazine giving corresponding hydrazones in high yield (92–96%) within short reaction time of 3–5 min. Electrophilic cyclization reaction
We report herein a highlyefficient and mild approach for synthesizing pharmacologically active bis(indolyl)methanes 3a–z, utilizing ZrO2 nanoparticles as a catalyst. The method involves a condensation reaction between indole and diverse aromatic aldehydes in acetonitrile under mild conditions. The ZrO2 nano-catalyst prepared via a co-precipitation method demonstrates exceptional efficacy, leading
A practical synthesis of bis(indolyl)methanes employing boric acid
作者:Jhillu S. Yadav、Manoj K. Gupta、Ruchi Jain、Nagendra N. Yadav、Basi V. Subba Reddy
DOI:10.1007/s00706-010-0355-8
日期:2010.9
A variety of aldehydes and ketones react rapidly with indoles in the presence of boric acid under solvent-free conditions to afford the corresponding bis(indolyl)methanes. Excellent yields and short reaction times together with the environmentally friendly nature of boric acid make this procedure useful and attractive to produce a variety of bis(indolyl)methanes. The use of boric acid makes it quite simple, more convenient, and practical. This new method offers several advantages such as high conversions, cleaner reaction profiles, short reaction times, and the use of inexpensive and readily available boric acid.