Efficient catalytic conversion of CO2 to quinazoline-2,4(1H,3H)-diones by a dual-site anion-functionalized ionic liquid: reconsidering the mechanism

Abstract

In order to elucidate the reaction mechanism of ionic liquid-catalyzed CO₂ with 2-aminobenzonitrile, [P₄₄₄₂]₂[Hy] with two N⁻ sites is designed for the efficient preparation of quinazoline-2,4(1H,3H)-diones. The results show that [Hy]²⁻ can activate 2-aminobenzonitrile by hydrogen bonding with –NH₂ in addition to activating CO₂, and the key intermediate is revealed.