Abstract
Based on an one-step acid-base neutralization method, several biocompatible anions-derived ionic liquids (bio-AILs) were prepared and characterized. They were first used as dual solvent-catalyst for cyclization of CO2 and 2-aminobenzonitriles to synthesize quinazoline-2,4(1H,3H)-diones. The influence of different bio-AILs structures on the cyclization reaction were studied, and [HTMG][Lae] was confirmed to be an excellent medium. By optimizing the reaction conditions, the [HTMG][Lae]-mediated cyclization reaction could afford a 96 % quinazoline-2,4(1H,3H)-dione yield at 70 °C, 1.0 MPa CO2 pressure for 6 h without other additives. The catalytic activities of various homogeneous media for transformation of CO2 into quinazoline-2,4(1H,3H)-dione were analyzed and compared. In addition, the reusability and general applicability of the [HTMG][Lae] medium were examined, the [HTMG][Lae] could show comparable activity in the fifth experiment, and it had good versatility for cyclization of CO2 with various 2-aminobenzonitriles. Finally, an insight into the activation behaviors of [HTMG][Lae] to reactants were further investigated, and based on this, a feasible reaction mechanism was proposed.
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