Novel ionic liquid N,N-diethyl-N-sulfoethanaminium hydrogen sulfate: Design, characterization, and application as a highly efficient catalyst for the production of triazolo[1,2-a]indazole-triones and 2H-indazolo[2,1-b]phthalazine-triones, By Abdolkarim Zare

Research

Title	Novel ionic liquid N,N-diethyl-N-sulfoethanaminium hydrogen sulfate: Design, characterization, and application as a highly efficient catalyst for the production of triazolo[1,2-a]indazole-triones and 2H-indazolo[2,1-b]phthalazine-triones
Type	Article
Keywords	Ionic liquid; N,N-diethyl-N-sulfoethanaminium hydrogen sulfate; triazolo[1,2-a]indazole-triones; 2H-indazolo[2,1-]phthalazine-triones
Journal	PHOSPHORUS SULFUR AND SILICON AND THE RELATED ELEMENTS
DOI	10.1080/10426507.2016.1149853
Researchers	Abdolkarim Zare (First researcher) , Fatemeh Masihpour (Second researcher)

Abstract

A novel Brønsted acidic ionic liquid namely N,N-diethyl-N-sulfoethanamminium hydrogen sulfate ([Et3N-SO3H]HSO4) was synthesized, and characterized using FT-IR, 1H NMR, 13C NMR, and mass data. Then, its catalytic activity was examined for the preparation of triazolo[1,2-a]-indazole-triones and 2H-indazolo[2,1-b]phthalazine-triones by the one-pot multi-component condensation of arylaldehydes with dimedone and 4-phenylurazole/2,3-dihydrophthalazine-1,4-dione under solvent-free conditions. [Et3N-SO3H]HSO4 efficiently promoted the reaction to afford the products in high yields and in short reaction times.