۳-Methyl-۱-sulfonic Acid Imidazolium Mesylate as a Novel, Highly Effective and Dual-functional Catalyst for the Solvent-free Production of Bis-coumarins

A novel ionic liquid entitled ۳-methyl-۱-sulfonic acid imidazolium mesylate ([Msim][OMs]) was synthesized, and characterized by studying its FT-IR, ۱H NMR, ۱۳C NMR and mass spectra. This ionic liquid was employed as a dual-functional catalyst for the preparation of bis-coumarins via the one-pot pseudo three-component reaction of ۴-hydroxycoumarin (۲ eq.) and arylaldehydes (۱ eq.) under solvent-free and relatively mild conditions. Owing to dual-functionality of [Msim][OMs] (having acidic and basic sites), it could act as a highly effective catalyst for the reaction. Additionally, an attractive mechanism based on dual-functionality of the catalyst was proposed.

کلیدواژه ها:

Ionic Liquid ، ۳-Methyl-۱-sulfonic acid imidazolium mesylate ([Msim][OMs]) ، Bis-coumarins ، Dual-functional catalyst ، Solvent-free