Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 53, Issue 23, Pages 5922-5925Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201400521
Keywords
carbon dioxide fixation; heterocylces; ionic liquids; reaction mechanism; synthetic methods
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Funding
- National Natural Science Foundation of China [21125314, 21021003]
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The chemical fixation of CO2 under mild reaction conditions is of significance from a sustainable chemistry viewpoint. Herein a CO2-reactive protic ionic liquid (PIL), [HDBU+][TFE-], was designed by neutralization of the superbase 1,8-diazabicyclo[5.4.0] undec-7-ene (DBU) with a weak proton donor trifluoroethanol (TFE). As a bifunctional catalyst for simultaneously activating CO2 and the substrate, this PIL displayed excellent performance in catalyzing the reactions of CO2 with 2-aminobenzonitriles at atmospheric pressure and room temperature, thus producing a series of quinazoline-2,4(1H,3H)-diones in excellent yields.
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