Dipak Prajapati

LITHIUM BROMIDE AS A NEW CATALYST FOR CARBON-CARBON BOND FORMATION IN THE SOLID STATE

Lithium bromide catalyses the condensation of carbonyl compounds with active methylene compounds in the absence of solvent, to afford olefinic products in high yields.

Microwave-promoted efficient synthesis of dihydroquinazolines

A solvent- and catalyst-free synthesis of dihydroquinazolines is described. 2,4-Disubstituted-1,2-dihydroquinazolines can be readily obtained from 2-aminobenzophenone and aldehydes under microwave irradiation using urea as an environmentally benign source of ammonia, with a small amount of the corresponding quinazolines as the minor product. The reaction is simple, clean and excellent yields are obtained within minutes.

Indium(III) catalysed substrate selective hydrothiolation of terminal alkynes

In(OTf)(3) is reported as the first catalyst having the ability to selectively catalyse both Markovnikov and anti-Markovnikov hydrothiolation of terminal alkynes under identical reaction conditions depending upon the nature of the thiol employed.

Regeneration of carbonyl compounds from oximes under microwave irradiations

Abstract A new and efficient method for the cleavage of oximes 1 has been achieved by a simple reaction of a ketoxime or an aldoxime with bismuth trichloride in tetrahydrofuran under microwave irradiations.

BiCl3 or Cdl2 catalyzed Michael addition of 1,3-dicarbonyl compounds under microwave irradiations

Abstract Cdl2 proves to be an efficient catalyst for Michael addition of 1,3-dicarbonyl compounds under microwave irradiations, through a simple solvent free reaction.

An indium mediated efficient chemoselective deoxygenation of N-oxides and nitrones

A simple and inexpensive procedure for the deoxygenation of N-oxides, such as N-arylnitrones, azoxybenzenes and N-heteroarene N-oxides with indium trichloride in acetonitrile at ambient pressure is described. The procedure gives high yields of deoxygenated products.

Bismuth(III) chloride-zinc promoted selective reduction of aromatic nitro compounds to azoxy compounds

Abstract In the presence of bismuth (III) chloride-metallic zinc aromatic nitro compounds have been found to be selectively reduced inter and intramolecularly to the corresponding N-oxides at ambient temperature in high yields.

Microwave-induced 1,3-dipolar cycloaddition of 2-aroyl-aziridines

Abstract 2-Aroyl-aziridines react with a variety of multiple bonds under microwave irradiation in an Erlenmeyer flask at ambient pressure to give the corresponding cycloadducts in high yields within few minutes.

Cadmium iodide as a new catalyst for knoevenagel condensations

Cadmium iodide catalyses the condensation of aldehydes with active methylene compounds, in the absence of solvent, to afford olefinic products in high yields.

Novel reductive coupling of aldimines to vicinal diamines

Abstract Reductive coupling of aldimines into vicinal diamines has been performed by the action of aluminium/ bismuth powder and potassium hydroxide in methanol at ambient temperature in high yields.