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

作者：Zare Abdolkarim^*; Masihpour Fatemeh

来源：Phosphorus, Sulfur, and Silicon and the Related Elements, 2016, 191(8): 1160-1165.

DOI：10.1080/10426507.2016.1149853

• N,N-Diethyl-N-sulfoethanamminium hydrogen sulfate ([Et3N-SO3H]HSO4)
• BrOnsted acidic ionic liquid
• triazolo[1,2-a]-indazole-trione
• 2H-indazolo[2,1-b]phthalazine-trione
• solvent-free

A novel BrOnsted acidic ionic liquid namely N,N-diethyl-N-sulfoethanamminium hydrogen sulfate ([Et3N-SO3H]HSO4) was synthesized, and characterized using FT-IR, H-1 NMR, C-13 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.

• 出版日期2016