Devdutt Chaturvedi

AN EFFICIENT ONE POT SYNTHESIS OF CARBAMATE ESTERS THROUGH ALCOHOLIC TOSYLATES

ABSTRACT An efficient O-alkylation of alcoholic tosylates with amines in a K2CO3/CO2 system in the presence of tetrabutyl ammonium iodide (TBAI) provides exclusive formation of carbamates. *CDRI-Communication no: 6143.

Ionic Liquids: A Class of Versatile Green Reaction Media for the Syntheses of Nitrogen Heterocycles

Ionic liquids have been emerging as a versatile class of green solvents with many projected advantages compared with conventional media. They have been described as “designer solvents” whose properties such as solubility, density, refractive index, and viscosity can be adjusted to suit requirements simply by making changes to the structure of either anion or cation or both. In organic synthesis, ionic liquids have been extensively used for the variety of synthetic transformations. Recently, plethoras of nitrogen heterocycles have been synthesized using variety of structurally diverse ionic liquids. In the present review, I would account the synthesis of various kinds of nitrogen heterocycles using variety of ionic liquids from the beginning to the recent reports.

An efficient, basic resin mediated, one-pot, synthesis of dithiocarbamates by Michael addition of dithiocarbamate anion to α, β-unsaturated compounds

A highly efficient, one-pot, synthesis of dithiocarbamates was accomplished in high yields by the Michael addition of dithiocarbamate anion to α, β-unsaturated compounds using Amberlite IRA 400 (basic resin). The reaction conditions are mild with extremely simple work-up procedures than the reported methods.

An efficient, one-pot synthesis of trithiocarbonates from the corresponding thiols using the Mitsunobu reagent

A novel Mitsunobu-based protocol has been developed for the synthesis of a variety of symmetrical and unsymmetrical trithiocarbonates from primary, secondary and tertiary thiols using carbon disulfide, in good to excellent yields. This protocol is mild and efficient compared to other reported methods.

An efficient, basic resin-mediated, one-pot regioselective synthesis of 2-hydroxy alkyl dithiocarbamates from corresponding epoxides

A mild and efficient one-pot regioselective synthesis of 2-hydroxy alkyl dithiocarbamates was accomplished in high yields from the corresponding amines and epoxides using carbon disulfide mediated by Amberlite IRA 400 (basic resin).

Triton-B-Catalyzed, Efficient, One-Pot Synthesis of Carbazates Through Alcoholic Tosylates

Abstract A quick, efficient, one-pot synthesis of carbazates was accomplished in high yields by the reaction of various tosylates of primary, secondary, and tert alcohols, with a variety of substituted hydrazines using the benzyltrimethylammonium hydroxide (Triton-B)/CO2 system. The reaction conditions are mild with simpler workup procedures than the reported methods.

Triton-B-Catalyzed, Efficient, Solvent-Free Synthesis of Benzopyrans

A convenient and microwave-promoted novel protocol for the syntheses of diverse kinds of substituted benzopyrans from the corresponding variety of substituted hydroxy acetophenones and keto compounds using benzyltrimethylammonium hydroxide (Triton-B) under solvent-free conditions has been developed. This protocol is mild and efficient than the other reported methods.

An Efficient, Basic Resin-Mediated, One-Pot Synthesis of Dithiocarbazates Through Alcoholic Tosylates

A quick and efficient, one-pot synthesis of dithiocarbazates was accomplished in high yields by the reaction of various alcoholic tosylates of primary, secondary, and tertiary alcohols, with substituted hydrazines using an Amberlite IRA 400 (basic resin)/CS 2 system. The reaction conditions are mild with simpler work-up procedures than previously reported methods.

An efficient, basic resin mediated, one-pot synthesis of dithiocarbazates from the corresponding alkyl halides

A quick and efficient, one-pot synthesis of dithiocarbazates was accomplished in high yields by reaction of various alkyl halides with substituted hydrazines using Amberlite IRA 400 (basic resin)/CS2 system. The reaction conditions are mild with extremely simple work-up procedures than the reported methods.