Journal
JOURNAL OF CO2 UTILIZATION
Volume 15, Issue -, Pages 115-122Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jcou.2016.03.002
Keywords
Carbon dioxide fixation; Bifunctional catalyst; Protic ionic liquid; Carboxylative cyclization; Quinazoline-2,4(1H, 3H)-diones
Funding
- National Natural Sciences Foundation of China
- Specialized Research Fund for the Doctoral Program of Higher Education [20130031110013]
- MOE Innovation Team of China [IRT13022]
- 111 Project of Ministry of Education of China [B06005]
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Despite recent renaissance of CO2 chemistry, transformation of CO2 at ambient conditions remains still of great challenge. In this work, an easily prepared protic ionic liquid e.g. 1,1,3,3-tetramethylguanidinium imidazolide [HTMG][Im] was developed as highly efficient, recyclable and bifunctional catalyst for the carboxylative cyclization of 2-aminobenzonitriles with CO2 at atmospheric pressure and room temperature. The catalytic protocol was found to be applicable to various 2-aminobenzonitriles bearing electron-withdrawing or electron-donating substituents, affording the corresponding quinazoline-2,4 (1H, 3H)-diones in moderate to excellent yields. In addition, the catalyst could be conveniently recovered and reused for five cycles with almost consistent activity. Consequently, this process represents an alternative approach for the efficient and greener chemical fixation of CO2 to afford valuable heterocycles. (C) 2016 Elsevier Ltd. All rights reserved.
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