Vanadium-catalyzed selective aerobic alcohol oxidation in ionic liquid [bmim]PF6

A selective aerobic oxidation of alcohols into the corresponding aldehydes or ketones was developed by using two-component system VO(acac)₂/DABCO in the ionic liquid [bmim]PF₆, and the catalysts can be recycled and reused for three runs without any significant loss of catalytic activity.     

A mild and efficient method for preparation of azides from alcohols using acidic ionic liquid [H-NMP]HSO4

We report here an efficient method for the synthesis and characterization of [H-NMP]HSO₄ and its application as an efficient catalyst and solvent for preparation of azides from corresponding alcohols under mild conditions. This processor showed high chemoselectivity for conversion of various alcohols to their corresponding azides.     

Efficient and green synthesis of 4H-pyrans and 4H-pyrano[2,3-c] pyrazoles catalyzed by task-specific ionic liquid [bmim]OH under solvent-free conditions

Abstract

A facile and convenient procedure for the synthesis of 4H-pyrans from aldehydes, malononitrile, and ethyl acetoacetate/acetylacetone and also synthesis of 4H-pyrano[2,3-c]pyrazoles from three-component condensation of aldehydes, malononitrile, and pyrazolone or four-component condensation of aldehydes, malononitrile, ethyl acetoacetate, and hydrazine monohydrate using [bmim]OH as task-specific ionic liquid has been described. The protocol proves to be efficient and environmentally benign in terms of high yields, low reaction times, ease of recovery, and reusability of reaction medium.

     

Nicotine-based ionic liquid supported on magnetic nanoparticles: An efficient and recyclable catalyst for selective one-pot synthesis of mono- and bis-4H-pyrimido[2,1-b]benzothiazoles

In this study, an acidic nicotine-based ionic liquid supported on magnetic nanoparticles ([NicTC]HSO₄@MNPs) was synthesized and characterized by different techniques. The activity of this catalyst was evaluated in a multi-component reaction of 2-aminobenzothiazole , aldehydes / dialdehydes and β-ketoesters/1,3-diketones to afford a series of novel mono- and bis-4H-pyrimido[2,1-b]benzothiazole derivatives. In addition, mild reaction conditions, high yields, excellent selectivity as well as easy recovery and reusability of the catalyst, make this method an economic and environmentally-benign process.