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Article

Rapid and Simple Microwave-Assisted Synthesis of Benzoxazoles Catalyzed by [CholineCl][Oxalic Acid]

by
Phuoc Thi Pham
1,2,
Hai Truong Nguyen
1,2,
The Thai Nguyen
1,2,
Linh Ho Thuy Nguyen
2,3,
Minh-Huy Dinh Dang
2,3,
Tan Le Hoang Doan
2,3,
Dung Duc Pham
4,
Cong Tien Nguyen
4 and
Phuong Hoang Tran
1,2,*
1
Department of Organic Chemistry, Faculty of Chemistry, University of Science, Ho Chi Minh City 700000, Vietnam
2
Vietnam National University, Ho Chi Minh City 700000, Vietnam
3
Center for Innovative Materials and Architectures (INOMAR), Ho Chi Minh City 700000, Vietnam
4
Faculty of Chemistry, University of Education, Ho Chi Minh City 700000, Vietnam
*
Author to whom correspondence should be addressed.
Catalysts 2022, 12(11), 1394; https://doi.org/10.3390/catal12111394
Submission received: 23 September 2022 / Revised: 28 October 2022 / Accepted: 4 November 2022 / Published: 9 November 2022
(This article belongs to the Special Issue Catalysts in Neoteric Solvents II)
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Abstract

Microwave irradiation has been used to enhance the reaction yields and selectivities for organic transformation. In this paper, microwave irradiation (MW) was investigated for the environmentally benign synthesis of benzoxazoles through the cyclization of 2-aminophenols and benzaldehydes using deep eutectic solvent (DES) as a catalyst. The [CholineCl][oxalic acid] was easily synthesized from choline chloride with oxalic acid and used without further purification. [CholineCl][oxalic acid] catalyzed the synthesis of benzoxazoles to produce the desired product in a good to excellent conversion and selectivity under MW irradiation. The presence of [CholineCl][oxalic acid] helps to promote the rapid heating transfer from microwave irradiation into the reaction mixture. The [CholineCl][oxalic acid] can be recovered and reused several times without a considerable degradation in catalytic activity.
Keywords: deep eutectic solvent; benzoxazole; microwave irradiation; green catalyst deep eutectic solvent; benzoxazole; microwave irradiation; green catalyst

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MDPI and ACS Style

Pham, P.T.; Nguyen, H.T.; Nguyen, T.T.; Nguyen, L.H.T.; Dang, M.-H.D.; Doan, T.L.H.; Pham, D.D.; Nguyen, C.T.; Tran, P.H. Rapid and Simple Microwave-Assisted Synthesis of Benzoxazoles Catalyzed by [CholineCl][Oxalic Acid]. Catalysts 2022, 12, 1394. https://doi.org/10.3390/catal12111394

AMA Style

Pham PT, Nguyen HT, Nguyen TT, Nguyen LHT, Dang M-HD, Doan TLH, Pham DD, Nguyen CT, Tran PH. Rapid and Simple Microwave-Assisted Synthesis of Benzoxazoles Catalyzed by [CholineCl][Oxalic Acid]. Catalysts. 2022; 12(11):1394. https://doi.org/10.3390/catal12111394

Chicago/Turabian Style

Pham, Phuoc Thi, Hai Truong Nguyen, The Thai Nguyen, Linh Ho Thuy Nguyen, Minh-Huy Dinh Dang, Tan Le Hoang Doan, Dung Duc Pham, Cong Tien Nguyen, and Phuong Hoang Tran. 2022. "Rapid and Simple Microwave-Assisted Synthesis of Benzoxazoles Catalyzed by [CholineCl][Oxalic Acid]" Catalysts 12, no. 11: 1394. https://doi.org/10.3390/catal12111394

APA Style

Pham, P. T., Nguyen, H. T., Nguyen, T. T., Nguyen, L. H. T., Dang, M.-H. D., Doan, T. L. H., Pham, D. D., Nguyen, C. T., & Tran, P. H. (2022). Rapid and Simple Microwave-Assisted Synthesis of Benzoxazoles Catalyzed by [CholineCl][Oxalic Acid]. Catalysts, 12(11), 1394. https://doi.org/10.3390/catal12111394

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