Sharif Digital Repository

This work reports the improved procedure for the preparation of bis(indolyl)methanes from the corresponding aldehydes and indole. Anhydrous copper(II) sulfate efficiently promotes the chemoselective synthesis of bis(indolyl)methanes via electrophilic substitution reactions of indole with aldehydes. The reaction was carried out in refluxing dichloromethane or microwave-assisted solvent-free conditions. The adducts were produced in good to excellent yields  

We report a simple, fast, efficient and benign procedure for solvent-free microwave-assisted one-pot synthesis of symmetrical 4H-pyran-4-ones in the presence of polyphosphoric acid or diphosphorous pentoxide. Various 4H-pyran-4-ones were prepared using this very simple and fast green protocol. ©2007 Sociedade Brasileira de Química  

KF/Al2O3 efficiently catalyzes aza-Michael addition of indole and 3-methylindole to a variety of electron-deficient conjugated alkenes such as α,β-unsaturated ketones, amides and nitriles. The N-alkylation adducts are produced in good to excellent yields and relatively in short times. The catalyst can be recycled for subsequent reactions without any appreciable loss of efficiency. © 2006 Bentham Science Publishers Ltd  

N-Benzyl-DABCO-ammonium tribromide was found to be an efficient and recyclable reagent for the deprotection of dithioacetals in dichloromethane/ methanol at room temperature. The reaction can be performed cleanly, in short time, and in high yield. Copyright © Taylor & Francis Group, LLC  

Potassium fluoride supported on alumina efficiently catalyzes Michael addition of aromatic and aliphatic thiols to a variety of conjugated alkenes such as α,β-unsaturated carbonyl compounds, carboxylic esters, amides, nitriles and chalcones. The Michael adducts are produced in good to excellent yields and relatively in short times. The catalyst can be recycled for subsequent reactions without any appreciable loss of efficiency. Copyright © Taylor & Francis, Inc