Rajkumar V. Hangarge

Knoevenagel condensation reactions in an ionic liquid

The condensation reaction of 4-oxo-(4H)-1-benzopyran-3-carbaldehydes and of aromatic aldehydes with 3-methyl-1-phenylpyrazolin-5-(4H)-one were carried out in an ionic liquid, ethylammonium nitrate, at room temperature in shorter times with higher yields of 78–92 and 70–75%, respectively, than found using conventional procedures.

Water mediated uncatalyzed facile synthesis ofylidenenitriles of 4-oxo-(4H)-1-benzopyran-3-carbaldehyde

A simple, efficient and environment ecofriendly route has been developed for the synthesis of ylidenenitriles of 4-oxo-(4H)-1-benzopyran-3-carbaldehyde by the condensation of 4-oxo-(4H)-1-benzopyran-3-carbaldehyde with active methylene compounds viz. malononitrile, cyanoacetic acid and cyanoacetamide in distilled water without catalyst at 90 °C for 1–2 h with quantitative yields and higher selectivity.

MICROWAVE INDUCED SYNTHESIS OF 3-METHYL-4-[(CHROMON-3-YL)- METHYLENE]-1-PHENYL PYRAZOLIN- 5-(4H)-ONES WITH ALUMINA SUPPORT AND IN SOLVENT FREE CONDITIONS

ABSTRACT 4-Oxo-(4H)-1-benzopyran-3-carboxaldehydes are condensed with 3-methyl-1-phenyl pyrazolin-5-(4H)-one under microwave activation to afford different 3-methyl-4-[(chromon-3-yl)- methylene]-1-phenyl pyrazolin-5-(4H)-ones (1–13) with alumina support and in solvent free conditions. The structures of the synthesized compounds have been established on the basis of their spectral data.

MICROWAVE INDUCED ABRAMOV REACTION OF 3-FORMYLCHROMONE WITH TRIALKYLPHOSPHITES

ABSTRACT Various dialkyl-1-(chromon-3-yl)-1-hydroxymethylphosphonates have been synthesized by microwave activation under solvent free condition using modified Abramov reaction.

Simple and High Yielding Synthesis of New α-Aminophosphonates from Imines

A simple and high yielding method was developed for the synthesis of novel α-aminophosphonates from imines, obtained from 2-chloroquinoline-3-carbaldehyde, by using triethylphosphite in the presence of chlorotrimethylsilane (TMSCl). This method developed for the synthesis of α -aminophosphonates gave excellent yields.

Simple and efficient synthesis of new O,O-diethyl phosphorothioates

A simple and highly effective method was developed for the synthesis of new O,O-diethyl phosphorothioates from O,O-diethyl phosphorochloridothioate and 2-chloroquinolin-3-ylmethanol derivatives in the presence of sodium hydroxide.