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Reusable proline-based ionic liquid catalyst for the simple synthesis of 2-arylbenzothiazoles in a biomass medium

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Abstract

A simple, efficient, and eco-friendly aerobic procedure for synthesis of 2-substituted benzothiazoles catalyzed by facile prepared [N2222][Pro] in a biomass medium (ethyl lactate) has been developed. The reactions afford the target 2-arylbenzothiazoles in good to excellent yields (>80 %) under air condition and was observed without use of chromatography. In addition, this proline-based ionic liquid catalyst can be easily recycled six times without loss of catalytic activity in gram scale synthesis.

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Acknowledgments

This work is supported by the Department of Education of Jiangxi Province and Key Laboratory of Functional Small Organic Molecules, Ministry of Education (No. GJJ13214, KLFS-KF-201229).

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Authors and Affiliations

  1. Key Laboratory of Functional Small Organic Molecules, Ministry of Education, College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang, 330022, Jiangxi, People’s Republic of China

    Zhi-Yu Yu, Qiu-Sheng Fang, Jia Zhou & Zhi-Bin Song

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  1. Zhi-Yu Yu
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  2. Qiu-Sheng Fang
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  3. Jia Zhou
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Correspondence to Zhi-Bin Song.

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Yu, ZY., Fang, QS., Zhou, J. et al. Reusable proline-based ionic liquid catalyst for the simple synthesis of 2-arylbenzothiazoles in a biomass medium. Res Chem Intermed 42, 2035–2045 (2016). https://doi.org/10.1007/s11164-015-2133-z

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